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Zhang D, Li YY, Zhao X, Zhang C, Liu DK, Lan S, Yin W, Liu ZJ. Molecular insights into self-incompatibility systems: From evolution to breeding. PLANT COMMUNICATIONS 2024; 5:100719. [PMID: 37718509 PMCID: PMC10873884 DOI: 10.1016/j.xplc.2023.100719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 08/18/2023] [Accepted: 09/13/2023] [Indexed: 09/19/2023]
Abstract
Plants have evolved diverse self-incompatibility (SI) systems for outcrossing. Since Darwin's time, considerable progress has been made toward elucidating this unrivaled reproductive innovation. Recent advances in interdisciplinary studies and applications of biotechnology have given rise to major breakthroughs in understanding the molecular pathways that lead to SI, particularly the strikingly different SI mechanisms that operate in Solanaceae, Papaveraceae, Brassicaceae, and Primulaceae. These best-understood SI systems, together with discoveries in other "nonmodel" SI taxa such as Poaceae, suggest a complex evolutionary trajectory of SI, with multiple independent origins and frequent and irreversible losses. Extensive exploration of self-/nonself-discrimination signaling cascades has revealed a comprehensive catalog of male and female identity genes and modifier factors that control SI. These findings also enable the characterization, validation, and manipulation of SI-related factors for crop improvement, helping to address the challenges associated with development of inbred lines. Here, we review current knowledge about the evolution of SI systems, summarize key achievements in the molecular basis of pollen‒pistil interactions, discuss potential prospects for breeding of SI crops, and raise several unresolved questions that require further investigation.
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Affiliation(s)
- Diyang Zhang
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Yuan-Yuan Li
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Xuewei Zhao
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou 350002, China; College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Cuili Zhang
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Ding-Kun Liu
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou 350002, China; College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Siren Lan
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
| | - Weilun Yin
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou 350002, China; College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China.
| | - Zhong-Jian Liu
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
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2
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MURASE K, TAKAYAMA S, ISOGAI A. Molecular mechanisms of self-incompatibility in Brassicaceae and Solanaceae. PROCEEDINGS OF THE JAPAN ACADEMY. SERIES B, PHYSICAL AND BIOLOGICAL SCIENCES 2024; 100:264-280. [PMID: 38599847 PMCID: PMC11170026 DOI: 10.2183/pjab.100.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Accepted: 12/26/2023] [Indexed: 04/12/2024]
Abstract
Self-incompatibility (SI) is a mechanism for preventing self-fertilization in flowering plants. SI is controlled by a single S-locus with multiple haplotypes (S-haplotypes). When the pistil and pollen share the same S-haplotype, the pollen is recognized as self and rejected by the pistil. This review introduces our research on Brassicaceae and Solanaceae SI systems to identify the S-determinants encoded at the S-locus and uncover the mechanisms of self/nonself-discrimination and pollen rejection. The recognition mechanisms of SI systems differ between these families. A self-recognition system is adopted by Brassicaceae, whereas a collaborative nonself-recognition system is used by Solanaceae. Work by our group and subsequent studies indicate that plants have evolved diverse SI systems.
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Affiliation(s)
- Kohji MURASE
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
- Japan Science and Technology Agency, Precursory Research for Embryonic Science and Technology, Kawaguchi, Saitama, Japan
| | - Seiji TAKAYAMA
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Akira ISOGAI
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Ikoma, Nara, Japan
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3
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You S, Zhao Z, Yu X, Zhu S, Wang J, Lei D, Zhou J, Li J, Chen H, Xiao Y, Chen W, Wang Q, Lu J, Chen K, Zhou C, Zhang X, Cheng Z, Guo X, Ren Y, Zheng X, Liu S, Liu X, Tian Y, Jiang L, Tao D, Wu C, Wan J. A toxin-antidote system contributes to interspecific reproductive isolation in rice. Nat Commun 2023; 14:7528. [PMID: 37980335 PMCID: PMC10657391 DOI: 10.1038/s41467-023-43015-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Accepted: 09/18/2023] [Indexed: 11/20/2023] Open
Abstract
Breakdown of reproductive isolation facilitates flow of useful trait genes into crop plants from their wild relatives. Hybrid sterility, a major form of reproductive isolation exists between cultivated rice (Oryza sativa) and wild rice (O. meridionalis, Mer). Here, we report the cloning of qHMS1, a quantitative trait locus controlling hybrid male sterility between these two species. Like qHMS7, another locus we cloned previously, qHMS1 encodes a toxin-antidote system, but differs in the encoded proteins, their evolutionary origin, and action time point during pollen development. In plants heterozygous at qHMS1, ~ 50% of pollens carrying qHMS1-D (an allele from cultivated rice) are selectively killed. In plants heterozygous at both qHMS1 and qHMS7, ~ 75% pollens without co-presence of qHMS1-Mer and qHMS7-D are selectively killed, indicating that the antidotes function in a toxin-dependent manner. Our results indicate that different toxin-antidote systems provide stacked reproductive isolation for maintaining species identity and shed light on breakdown of hybrid male sterility.
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Affiliation(s)
- Shimin You
- State Key Laboratory for Crop Genetics & Germplasm Enhancement and Utilization, Nanjing Agricultural University, Zhongshan Biological Breeding Laboratory, Nanjing, 210095, China
| | - Zhigang Zhao
- State Key Laboratory for Crop Genetics & Germplasm Enhancement and Utilization, Nanjing Agricultural University, Zhongshan Biological Breeding Laboratory, Nanjing, 210095, China
| | - Xiaowen Yu
- State Key Laboratory for Crop Genetics & Germplasm Enhancement and Utilization, Nanjing Agricultural University, Zhongshan Biological Breeding Laboratory, Nanjing, 210095, China
| | - Shanshan Zhu
- State Key Laboratory of Crop Gene Resources and Breeding, Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS), Beijing, 100081, China
| | - Jian Wang
- State Key Laboratory of Crop Gene Resources and Breeding, Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS), Beijing, 100081, China
| | - Dekun Lei
- State Key Laboratory for Crop Genetics & Germplasm Enhancement and Utilization, Nanjing Agricultural University, Zhongshan Biological Breeding Laboratory, Nanjing, 210095, China
| | - Jiawu Zhou
- Yunnan Seed Laboratory/Yunnan Key Laboratory for Rice Genetic Improvement, Food Crops Research Institute, Yunnan Academy of Agricultural Sciences (YAAS), Kunming, 650200, P. R. China
| | - Jing Li
- Yunnan Seed Laboratory/Yunnan Key Laboratory for Rice Genetic Improvement, Food Crops Research Institute, Yunnan Academy of Agricultural Sciences (YAAS), Kunming, 650200, P. R. China
| | - Haiyuan Chen
- State Key Laboratory for Crop Genetics & Germplasm Enhancement and Utilization, Nanjing Agricultural University, Zhongshan Biological Breeding Laboratory, Nanjing, 210095, China
| | - Yanjia Xiao
- State Key Laboratory for Crop Genetics & Germplasm Enhancement and Utilization, Nanjing Agricultural University, Zhongshan Biological Breeding Laboratory, Nanjing, 210095, China
| | - Weiwei Chen
- State Key Laboratory of Crop Gene Resources and Breeding, Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS), Beijing, 100081, China
| | - Qiming Wang
- State Key Laboratory for Crop Genetics & Germplasm Enhancement and Utilization, Nanjing Agricultural University, Zhongshan Biological Breeding Laboratory, Nanjing, 210095, China
| | - Jiayu Lu
- State Key Laboratory for Crop Genetics & Germplasm Enhancement and Utilization, Nanjing Agricultural University, Zhongshan Biological Breeding Laboratory, Nanjing, 210095, China
| | - Keyi Chen
- State Key Laboratory for Crop Genetics & Germplasm Enhancement and Utilization, Nanjing Agricultural University, Zhongshan Biological Breeding Laboratory, Nanjing, 210095, China
| | - Chunlei Zhou
- State Key Laboratory for Crop Genetics & Germplasm Enhancement and Utilization, Nanjing Agricultural University, Zhongshan Biological Breeding Laboratory, Nanjing, 210095, China
| | - Xin Zhang
- State Key Laboratory of Crop Gene Resources and Breeding, Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS), Beijing, 100081, China
| | - Zhijun Cheng
- State Key Laboratory of Crop Gene Resources and Breeding, Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS), Beijing, 100081, China
| | - Xiuping Guo
- State Key Laboratory of Crop Gene Resources and Breeding, Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS), Beijing, 100081, China
| | - Yulong Ren
- State Key Laboratory of Crop Gene Resources and Breeding, Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS), Beijing, 100081, China
| | - Xiaoming Zheng
- State Key Laboratory of Crop Gene Resources and Breeding, Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS), Beijing, 100081, China
| | - Shijia Liu
- State Key Laboratory for Crop Genetics & Germplasm Enhancement and Utilization, Nanjing Agricultural University, Zhongshan Biological Breeding Laboratory, Nanjing, 210095, China
| | - Xi Liu
- State Key Laboratory for Crop Genetics & Germplasm Enhancement and Utilization, Nanjing Agricultural University, Zhongshan Biological Breeding Laboratory, Nanjing, 210095, China
| | - Yunlu Tian
- State Key Laboratory for Crop Genetics & Germplasm Enhancement and Utilization, Nanjing Agricultural University, Zhongshan Biological Breeding Laboratory, Nanjing, 210095, China
| | - Ling Jiang
- State Key Laboratory for Crop Genetics & Germplasm Enhancement and Utilization, Nanjing Agricultural University, Zhongshan Biological Breeding Laboratory, Nanjing, 210095, China
| | - Dayun Tao
- Yunnan Seed Laboratory/Yunnan Key Laboratory for Rice Genetic Improvement, Food Crops Research Institute, Yunnan Academy of Agricultural Sciences (YAAS), Kunming, 650200, P. R. China.
| | - Chuanyin Wu
- State Key Laboratory of Crop Gene Resources and Breeding, Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS), Beijing, 100081, China.
| | - Jianmin Wan
- State Key Laboratory for Crop Genetics & Germplasm Enhancement and Utilization, Nanjing Agricultural University, Zhongshan Biological Breeding Laboratory, Nanjing, 210095, China.
- State Key Laboratory of Crop Gene Resources and Breeding, Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS), Beijing, 100081, China.
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Wang L, Filatov DA. Mechanisms of prezygotic post-pollination reproductive barriers in plants. FRONTIERS IN PLANT SCIENCE 2023; 14:1230278. [PMID: 37476168 PMCID: PMC10354421 DOI: 10.3389/fpls.2023.1230278] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Accepted: 06/21/2023] [Indexed: 07/22/2023]
Abstract
Hybridisation between individuals of different species can lead to maladapted or inviable progeny due to genetic incompatibilities between diverging species. On the other hand, mating with close relatives, or self-fertilisation may lead to inbreeding depression. Thus, both too much or too little divergence may lead to problems and the organisms have to carefully choose mating partners to avoid both of these pitfalls. In plants this choice occurs at many stages during reproduction, but pollen-pistil interactions play a particularly important role in avoiding inbreeding and hybridisation with other species. Interestingly, the mechanisms involved in avoidance of selfing and interspecific hybridisation may work via shared molecular pathways, as self-incompatible species tend to be more 'choosy' with heterospecific pollen compared to self-compatible ones. This review discusses various prezygotic post-pollination barriers to interspecific hybridisation, with a focus on the mechanisms of pollen-pistil interactions and their role in the maintenance of species integrity.
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Affiliation(s)
- Ludi Wang
- Institute of Biological, Environmental and Rural Sciences (IBERS), Aberystwyth University, Gogerddan, Aberystwyth, United Kingdom
| | - Dmitry A. Filatov
- Department of Biology, University of Oxford, South Parks Road, Oxford, United Kingdom
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5
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Ohata M, Takada Y, Sato Y, Okamoto T, Murase K, Takayama S, Suzuki G, Watanabe M. MLPK function is not required for self-incompatibility in the S 29 haplotype of Brassica rapa L. PLANT REPRODUCTION 2023:10.1007/s00497-023-00463-w. [PMID: 37099188 PMCID: PMC10363064 DOI: 10.1007/s00497-023-00463-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Accepted: 04/09/2023] [Indexed: 06/19/2023]
Abstract
S29 haplotype does not require the MLPK function for self-incompatibility in Brassica rapa. Self-incompatibility (SI) in Brassicaceae is regulated by the self-recognition mechanism, which is based on the S-haplotype-specific direct interaction of the pollen-derived ligand, SP11/SCR, and the stigma-side receptor, SRK. M locus protein kinase (MLPK) is known to be one of the positive effectors of the SI response. MLPK directly interacts with SRK, and is phosphorylated by SRK in Brassica rapa. In Brassicaceae, MLPK was demonstrated to be essential for SI in B. rapa and Brassica napus, whereas it is not essential for SI in Arabidopsis thaliana (with introduced SRK and SP11/SCR from related SI species). Little is known about what determines the need for MLPK in SI of Brassicaceae. In this study, we investigated the relationship between S-haplotype diversity and MLPK function by analyzing the SI phenotypes of different S haplotypes in a mlpk/mlpk mutant background. The results have clarified that in B. rapa, all the S haplotypes except the S29 we tested need the MLPK function, but the S29 haplotype does not require MLPK for the SI. Comparative analysis of MLPK-dependent and MLPK-independent S haplotype might provide new insight into the evolution of S-haplotype diversity and the molecular mechanism of SI in Brassicaceae.
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Affiliation(s)
- Mayu Ohata
- Graduate School of Life Sciences, Tohoku University, Sendai, 980-8577, Japan
| | - Yoshinobu Takada
- Graduate School of Life Sciences, Tohoku University, Sendai, 980-8577, Japan.
| | - Yui Sato
- Graduate School of Life Sciences, Tohoku University, Sendai, 980-8577, Japan
| | - Takumi Okamoto
- Graduate School of Life Sciences, Tohoku University, Sendai, 980-8577, Japan
- Department of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, 422-8526, Japan
| | - Kohji Murase
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 113-8657, Japan
| | - Seiji Takayama
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 113-8657, Japan
| | - Go Suzuki
- Division of Natural Science, Osaka Kyoiku University, Kashiwara, 582-8582, Japan
| | - Masao Watanabe
- Graduate School of Life Sciences, Tohoku University, Sendai, 980-8577, Japan.
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6
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Ye C, He Z, Peng J, Wang R, Wang X, Fu M, Zhang Y, Wang A, Liu Z, Jia G, Chen Y, Tian B. Genomic and genetic advances of oiltea-camellia ( Camellia oleifera). FRONTIERS IN PLANT SCIENCE 2023; 14:1101766. [PMID: 37077639 PMCID: PMC10106683 DOI: 10.3389/fpls.2023.1101766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Accepted: 03/22/2023] [Indexed: 05/03/2023]
Abstract
Oiltea-camellia (C. oleifera) is a widely cultivated woody oil crop in Southern China and Southeast Asia. The genome of oiltea-camellia was very complex and not well explored. Recently, genomes of three oiltea-camellia species were sequenced and assembled, multi-omic studies of oiltea-camellia were carried out and provided a better understanding of this important woody oil crop. In this review, we summarized the recent assembly of the reference genomes of oiltea-camellia, genes related to economic traits (flowering, photosynthesis, yield and oil component), disease resistance (anthracnose) and environmental stress tolerances (drought, cold, heat and nutrient deficiency). We also discussed future directions of integrating multiple omics for evaluating genetic resources and mining key genes of important traits, and the application of new molecular breeding and gene editing technologies to accelerate the breeding process of oiltea-camellia.
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Affiliation(s)
- Changrong Ye
- Academy of Innovation and Research, Huazhi Biotechnology Co. Ltd., Changsha, China
| | - Zhilong He
- Research Institute of Oil Tea Camellia, Hunan Academy of Forestry, Changsha, China
| | - Jiayu Peng
- Academy of Innovation and Research, Huazhi Biotechnology Co. Ltd., Changsha, China
| | - Rui Wang
- Research Institute of Oil Tea Camellia, Hunan Academy of Forestry, Changsha, China
| | - Xiangnan Wang
- Research Institute of Oil Tea Camellia, Hunan Academy of Forestry, Changsha, China
| | - Mengjiao Fu
- Department of Research and Development, Mountain Yuelu Breeding Innovation Center, Changsha, China
| | - Ying Zhang
- Research Institute of Oil Tea Camellia, Hunan Academy of Forestry, Changsha, China
| | - Ai Wang
- Department of Research and Development, Mountain Yuelu Breeding Innovation Center, Changsha, China
| | - Zhixian Liu
- Department of Research and Development, Mountain Yuelu Breeding Innovation Center, Changsha, China
| | - Gaofeng Jia
- Academy of Innovation and Research, Huazhi Biotechnology Co. Ltd., Changsha, China
- Department of Research and Development, Mountain Yuelu Breeding Innovation Center, Changsha, China
- *Correspondence: Gaofeng Jia, ; Yongzhong Chen, ; Bingchuan Tian,
| | - Yongzhong Chen
- Research Institute of Oil Tea Camellia, Hunan Academy of Forestry, Changsha, China
- *Correspondence: Gaofeng Jia, ; Yongzhong Chen, ; Bingchuan Tian,
| | - Bingchuan Tian
- Academy of Innovation and Research, Huazhi Biotechnology Co. Ltd., Changsha, China
- Department of Research and Development, Mountain Yuelu Breeding Innovation Center, Changsha, China
- *Correspondence: Gaofeng Jia, ; Yongzhong Chen, ; Bingchuan Tian,
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7
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Tsuchimatsu T, Fujii S. The selfing syndrome and beyond: diverse evolutionary consequences of mating system transitions in plants. Philos Trans R Soc Lond B Biol Sci 2022; 377:20200510. [PMID: 35634918 PMCID: PMC9149797 DOI: 10.1098/rstb.2020.0510] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Accepted: 12/04/2021] [Indexed: 07/20/2023] Open
Abstract
The shift from outcrossing to self-fertilization (selfing) is considered one of the most prevalent evolutionary transitions in flowering plants. Selfing species tend to share similar reproductive traits in morphology and function, and such a set of traits is called the 'selfing syndrome'. Although the genetic basis of the selfing syndrome has been of great interest to evolutionary biologists, knowledge of the causative genes or mutations was limited until recently. Thanks to advances in population genomic methodologies combined with high-throughput sequencing technologies, several studies have successfully unravelled the molecular and genetic basis for evolution of the selfing syndrome in Capsella, Arabidopsis, Solanum and other genera. Here we first introduce recent research examples that have explored the loci, genes and mutations responsible for the selfing syndrome traits, such as reductions in petal size or in pollen production, that are mainly relevant to pre-pollination processes. Second, we review the relationship between the evolution of selfing and interspecific pollen transfer, highlighting the findings of post-pollination reproductive barriers at the molecular level. We then discuss the emerging view of patterns in evolution of the selfing syndrome, such as the pervasive involvement of loss-of-function mutations and the relative importance of selection versus neutral degradation. This article is part of the theme issue 'Genetic basis of adaptation and speciation: from loci to causative mutations'.
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Affiliation(s)
- Takashi Tsuchimatsu
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku 113-0033, Japan
| | - Sota Fujii
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku 113-8657, Japan
- Suntory Rising Stars Encouragement Program in Life Sciences (SunRiSE) Fellow, Bunkyo, Japan
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8
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Wang J, Chen J, Huang S, Han D, Li J, Guo D. Investigating the Mechanism of Unilateral Cross Incompatibility in Longan ( Dimocarpus longan Lour.) Cultivars (Yiduo × Shixia). FRONTIERS IN PLANT SCIENCE 2022; 12:821147. [PMID: 35222456 PMCID: PMC8874016 DOI: 10.3389/fpls.2021.821147] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Accepted: 12/30/2021] [Indexed: 06/14/2023]
Abstract
Longan (Dimocarpus longan Lour.) is an important subtropical fruit tree in China. Nearly 90% of longan fruit imports from Thailand are from the cultivar Yiduo. However, we have observed that there exists a unilateral cross incompatibility (UCI) when Yiduo is used as a female parent and Shixia (a famous Chinese cultivar) as a male parent. Here, we performed a comparative transcriptome analysis coupled with microscopy of pistils from two reciprocal pollination combinations [Shixia♂ × Yiduo♀(SY) and Yiduo♀ × Shixia♂(YS)] 4, 8, 12, and 24 h after pollination. We also explored endogenous jasmonic acid (JA) and jasmonyl isoleucine (JA-Ile) levels in pistils of the crosses. The microscopic observations showed that the UCI was sporophytic. The endogenous JA and JA-Ile levels were higher in YS than in SY at the studied time points. We found 7,251 differentially expressed genes from the transcriptome analysis. Our results highlighted that genes associated with JA biosynthesis and signaling, pollen tube growth, cell wall modification, starch and sucrose biosynthesis, and protein processing in endoplasmic reticulum pathways were differentially regulated between SY and YS. We discussed transcriptomic changes in the above-mentioned pathways regarding the observed microscopic and/or endogenous hormone levels. This is the first report on the elaboration of transcriptomic changes in longan reciprocal pollination combination showing UCI. The results presented here will enable the longan breeding community to better understand the mechanisms of UCI.
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Affiliation(s)
- Jing Wang
- Institute of Fruit Tree Research, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Key Laboratory of South Subtropical Fruit Biology and Genetic Resource Utilization, Guangdong Provincial Key Laboratory of Tropical and Subtropical Fruit Tree Research, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Ji Chen
- College of Horticulture, South China Agricultural University, Guangzhou, China
| | - Shilian Huang
- Institute of Fruit Tree Research, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Key Laboratory of South Subtropical Fruit Biology and Genetic Resource Utilization, Guangdong Provincial Key Laboratory of Tropical and Subtropical Fruit Tree Research, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Dongmei Han
- Institute of Fruit Tree Research, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Key Laboratory of South Subtropical Fruit Biology and Genetic Resource Utilization, Guangdong Provincial Key Laboratory of Tropical and Subtropical Fruit Tree Research, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Jianguang Li
- Institute of Fruit Tree Research, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Key Laboratory of South Subtropical Fruit Biology and Genetic Resource Utilization, Guangdong Provincial Key Laboratory of Tropical and Subtropical Fruit Tree Research, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Dongliang Guo
- Institute of Fruit Tree Research, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Key Laboratory of South Subtropical Fruit Biology and Genetic Resource Utilization, Guangdong Provincial Key Laboratory of Tropical and Subtropical Fruit Tree Research, Ministry of Agriculture and Rural Affairs, Guangzhou, China
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9
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Genetic Diversity of Genes Controlling Unilateral Incompatibility in Japanese Cultivars of Chinese Cabbage. PLANTS 2021; 10:plants10112467. [PMID: 34834830 PMCID: PMC8619800 DOI: 10.3390/plants10112467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 11/01/2021] [Accepted: 11/12/2021] [Indexed: 11/17/2022]
Abstract
In recent years, unilateral incompatibility (UI), which is an incompatibility system for recognizing and rejecting foreign pollen that operates in one direction, has been shown to be closely related to self-incompatibility (SI) in Brassica rapa. The stigma- and pollen-side recognition factors (SUI1 and PUI1, respectively) of this UI are similar to those of SI (stigma-side SRK and pollen-side SP11), indicating that SUI1 and PUI1 interact with each other and cause pollen-pistil incompatibility only when a specific genotype is pollinated. To clarify the genetic diversity of SUI1 and PUI1 in Japanese B. rapa, here we investigated the UI phenotype and the SUI1/PUI1 sequences in Japanese commercial varieties of Chinese cabbage. The present study showed that multiple copies of nonfunctional PUI1 were located within and in the vicinity of the UI locus region, and that the functional SUI1 was highly conserved in Chinese cabbage. In addition, we found a novel nonfunctional SUI1 allele with a dominant negative effect on the functional SUI1 allele in the heterozygote.
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10
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Broz AK, Simpson-Van Dam A, Tovar-Méndez A, Hahn MW, McClure B, Bedinger PA. Spread of self-compatibility constrained by an intrapopulation crossing barrier. THE NEW PHYTOLOGIST 2021; 231:878-891. [PMID: 33864700 DOI: 10.1111/nph.17400] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2021] [Accepted: 04/09/2021] [Indexed: 06/12/2023]
Abstract
Mating system transitions from self-incompatibility (SI) to self-compatibility (SC) are common in plants. In the absence of high levels of inbreeding depression, SC alleles are predicted to spread due to transmission advantage and reproductive assurance. We characterized mating system and pistil-expressed SI factors in 20 populations of the wild tomato species Solanum habrochaites from the southern half of the species range. We found that a single SI to SC transition is fixed in populations south of the Rio Chillon valley in central Peru. In these populations, SC correlated with the presence of the hab-6 S-haplotype that encodes a low activity S-RNase protein. We identified a single population segregating for SI/SC and hab-6. Intrapopulation crosses showed that hab-6 typically acts in the expected codominant fashion to confer SC. However, we found one specific S-haplotype (hab-10) that consistently rejects pollen of the hab-6 haplotype, and results in SI hab-6/hab-10 heterozygotes. We suggest that the hab-10 haplotype could act as a genetic mechanism to stabilize mixed mating in this population by presenting a disadvantage for the hab-6 haplotype. This barrier may represent a mechanism allowing for the persistence of SI when an SC haplotype appears in or invades a population.
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Affiliation(s)
- Amanda K Broz
- Department of Biology, Colorado State University, Fort Collins, CO, 80523-1878, USA
| | | | | | - Matthew W Hahn
- Department of Biology, Indiana University, Bloomington, IN, 47405, USA
- Department of Computer Science, Indiana University, Bloomington, IN, 47405, USA
| | - Bruce McClure
- Department of Biochemistry, University of Missouri-Columbia, Columbia, MO, 65211, USA
| | - Patricia A Bedinger
- Department of Biology, Colorado State University, Fort Collins, CO, 80523-1878, USA
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11
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Fukushima K, Kanomata T, Kon A, Masuko-Suzuki H, Ito K, Ogata S, Takada Y, Komatsubara Y, Nakamura T, Watanabe T, Koizumi S, Sanuki H, Park JI, Niikura S, Suwabe K, Fujii S, Murase K, Takayama S, Suzuki G, Watanabe M. Spatiogenetic characterization of S receptor kinase (SRK) alleles in naturalized populations of Raphanus sativus L. var. raphanistroides on Yakushima island. Genes Genet Syst 2021; 96:129-139. [PMID: 34148895 DOI: 10.1266/ggs.20-00066] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
In various coastal areas of Japan, naturalized radish populations are observed. Radish is a cruciferous plant and exhibits self-incompatibility, involving a system controlled by a single locus with multiple S alleles. Although the S allele diversity of radish cultivars and wild radishes has been characterized, the S allele distribution in naturalized populations has not yet been analyzed in relation to the positions of the plants in situ. Here, we show the S allele distribution in naturalized radish populations of Yakushima, a small island in the East China Sea, with positions of the plants. Radish plants were sampled in coastal areas in Yakushima, and their S alleles were detected and characterized. Most of the S alleles had been previously identified in radish cultivars. However, four novel S alleles, which may be unique to Yakushima, were also found. Moreover, seeds in siliques from plants growing in the study areas were sampled, and S allele determination in DNA extracted from these seeds suggested that the plants had exchanged their pollen among their close neighbors. There was also a problem in that the PCR amplification of some SRK alleles was difficult because of their sequence diversity in the naturalized populations, as occurs in cultivars. Our results suggest that the exchange of S alleles between cultivars and naturalized populations occurs and that S alleles in naturalized populations are highly diverse. The methodology established in our study should be applicable to other self-incompatible species to dissect the diversity of S allele distribution in naturalized populations.
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Affiliation(s)
| | - Toko Kanomata
- Miyagi Prefecture Sendaidaiichi High School.,Exploring-Germination-and-Growth Program for Young Scientists, Tohoku University
| | - Aoi Kon
- Graduate School of Life Sciences, Tohoku University
| | | | - Kana Ito
- Graduate School of Life Sciences, Tohoku University
| | | | | | | | | | | | - Saori Koizumi
- Yakushima Environmental and Cultural Learning Center
| | | | - Jong-In Park
- Department of Horticulture, Sunchon National University
| | | | | | - Sota Fujii
- Graduate School of Agriculture and Life Sciences, The University of Tokyo
| | - Kohji Murase
- Graduate School of Agriculture and Life Sciences, The University of Tokyo.,PRESTO, Japan Science and Technology Agency (JST)
| | - Seiji Takayama
- Graduate School of Agriculture and Life Sciences, The University of Tokyo
| | - Go Suzuki
- Division of Natural Science, Osaka Kyoiku University
| | - Masao Watanabe
- Graduate School of Life Sciences, Tohoku University.,Exploring-Germination-and-Growth Program for Young Scientists, Tohoku University
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12
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Abstract
Pollen-pistil interactions serve as important prezygotic reproductive barriers that play a critical role in mate selection in plants. Here, we highlight recent progress toward understanding the molecular basis of pollen-pistil interactions as reproductive isolating barriers. These barriers can be active systems of pollen rejection, or they can result from a mismatch of required male and female factors. In some cases, the barriers are mechanistically linked to self-incompatibility systems, while others represent completely independent processes. Pollen-pistil reproductive barriers can act as soon as pollen is deposited on a stigma, where penetration of heterospecific pollen tubes is blocked by the stigma papillae. As pollen tubes extend, the female transmitting tissue can selectively limit growth by producing cell wall-modifying enzymes and cytotoxins that interact with the growing pollen tube. At ovules, differential pollen tube attraction and inhibition of sperm cell release can act as barriers to heterospecific pollen tubes.
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Affiliation(s)
- Amanda K Broz
- Department of Biology, Colorado State University, Fort Collins, Colorado 80523-1878, USA; ,
| | - Patricia A Bedinger
- Department of Biology, Colorado State University, Fort Collins, Colorado 80523-1878, USA; ,
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13
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Duan Z, Dou S, Liu Z, Li B, Yi B, Shen J, Tu J, Fu T, Dai C, Ma C. Comparative phosphoproteomic analysis of compatible and incompatible pollination in Brassica napus L. Acta Biochim Biophys Sin (Shanghai) 2020; 52:446-456. [PMID: 32268372 DOI: 10.1093/abbs/gmaa011] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2019] [Revised: 11/27/2019] [Accepted: 02/14/2020] [Indexed: 12/31/2022] Open
Abstract
Self-incompatibility (SI) promotes outbreeding and prevents self-fertilization to promote genetic diversity in angiosperms. Several studies have been carried to investigate SI signaling in plants; however, protein phosphorylation and dephosphorylation in the fine-tuning of the SI response remain insufficiently understood. Here, we performed a phosphoproteomic analysis to identify the phosphoproteins in the stigma of self-compatible 'Westar' and self-incompatible 'W-3' Brassica napus lines. A total of 4109 phosphopeptides representing 1978 unique protein groups were identified. Moreover, 405 and 248 phosphoproteins were significantly changed in response to SI and self-compatibility, respectively. Casein kinase II (CK II) phosphorylation motifs were enriched in self-incompatible response and identified 127 times in 827 dominant SI phosphorylation residues. Functional annotation of the identified phosphoproteins revealed the major roles of these phosphoproteins in plant-pathogen interactions, cell wall modification, mRNA surveillance, RNA degradation, and plant hormone signal transduction. In particular, levels of homolog proteins ABF3, BKI1, BZR2/BSE1, and EIN2 were significantly increased in pistils pollinated with incompatible pollens. Abscisic acid and ethephon treatment partially inhibited seed set, while brassinolide promoted pollen germination and tube growth in SI response. Collectively, our results provided an overview of protein phosphorylation during compatible/incompatible pollination, which may be a potential component of B. napus SI responses.
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Affiliation(s)
- Zhiqiang Duan
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, China
| | - Shengwei Dou
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, China
| | - Zhiquan Liu
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, China
| | - Bing Li
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, China
| | - Bin Yi
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, China
| | - Jinxiong Shen
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, China
| | - Jinxing Tu
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, China
| | - Tingdong Fu
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, China
| | - Cheng Dai
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, China
| | - Chaozhi Ma
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, China
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14
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Mori N, Katayama T, Saito R, Iwashita K, Maruyama JI. Inter-strain expression of sequence-diverse HET domain genes severely inhibits growth of Aspergillus oryzae. Biosci Biotechnol Biochem 2019; 83:1557-1569. [DOI: 10.1080/09168451.2019.1580138] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
ABSTRACT
In the Pezizomycotina (filamentous ascomycete) species, genes that encode proteins with an HET domain (Pfam: PF06985) are reportedly involved in heterokaryon incompatibility (HI) in which cell death or growth defects are induced after fusion of cells that are genetically incompatible owing to diversities in their nucleotide sequence. HET domain genes are commonly found in Pezizomycotina genomes and are functionally characterized in only a few species. Here, we compared 44 HET domain genes between an incompatible strain pair of Aspergillus oryzae RIB40 and RIB128 and performed inter-strain expression of 37 sequence-diverse genes for mimicking HI. Four HET domain genes were identified to cause severe growth inhibition in a strain- or sequence-specific manner. Furthermore, SNPs responsible for the inhibition of cell growth were identified. This study provides an important insight into the physiological significance of sequence diversity of HET domain genes and their potential functions in HI of A. oryzae.
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Affiliation(s)
- Noriko Mori
- Department of Biotechnology, The University of Tokyo, Tokyo, Japan
| | - Takuya Katayama
- Department of Biotechnology, The University of Tokyo, Tokyo, Japan
- Collaborative Research Institute for Innovative Microbiology, The University of Tokyo, Tokyo, Japan
| | - Ryota Saito
- Division of Fundamental Research, National Research Institute of Brewing (NRIB), Hiroshima, Japan
| | - Kazuhiro Iwashita
- Division of Fundamental Research, National Research Institute of Brewing (NRIB), Hiroshima, Japan
| | - Jun-ichi Maruyama
- Department of Biotechnology, The University of Tokyo, Tokyo, Japan
- Collaborative Research Institute for Innovative Microbiology, The University of Tokyo, Tokyo, Japan
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15
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Fujii S, Tsuchimatsu T, Kimura Y, Ishida S, Tangpranomkorn S, Shimosato-Asano H, Iwano M, Furukawa S, Itoyama W, Wada Y, Shimizu KK, Takayama S. A stigmatic gene confers interspecies incompatibility in the Brassicaceae. NATURE PLANTS 2019; 5:731-741. [PMID: 31263241 DOI: 10.1038/s41477-019-0444-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Accepted: 05/09/2019] [Indexed: 06/09/2023]
Abstract
Pre-zygotic interspecies incompatibility in angiosperms is a male-female relationship that inhibits the formation of hybrids between two species. Here, we report on the identification of STIGMATIC PRIVACY 1 (SPRI1), an interspecies barrier gene in Arabidopsis thaliana. We show that the rejection activity of this stigma-specific plasma membrane protein is effective against distantly related Brassicaceae pollen tubes and is independent of self-incompatibility. Point-mutation experiments and functional tests of synthesized hypothetical ancestral forms of SPRI1 suggest evolutionary decay of SPRI1-controlled interspecies incompatibility in self-compatible A. thaliana. Hetero-pollination experiments indicate that SPRI1 ensures intraspecific fertilization in the pistil when pollen from other species are present. Our study supports the idea that SPRI1 functions as a barrier mechanism that permits entrance of pollen with an intrinsic signal from self species.
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Affiliation(s)
- Sota Fujii
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan.
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Nara, Japan.
- Japan Science and Technology Agency, Precursory Research for Embryonic Science and Technology, Saitama, Japan.
| | - Takashi Tsuchimatsu
- Department of Biology, Graduate School of Science, Chiba University, Chiba, Japan
| | - Yuka Kimura
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Shota Ishida
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | | | - Hiroko Shimosato-Asano
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Nara, Japan
| | - Megumi Iwano
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Nara, Japan
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Shoko Furukawa
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Nara, Japan
| | - Wakana Itoyama
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Nara, Japan
| | - Yuko Wada
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Nara, Japan
| | - Kentaro K Shimizu
- Department of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland
- Kihara Institute for Biological Research, Yokohama City University, Yokohama, Japan
| | - Seiji Takayama
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan.
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Nara, Japan.
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16
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Jany E, Nelles H, Goring DR. The Molecular and Cellular Regulation of Brassicaceae Self-Incompatibility and Self-Pollen Rejection. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2018; 343:1-35. [PMID: 30712670 DOI: 10.1016/bs.ircmb.2018.05.011] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
In flowering plants, sexual reproduction is actively regulated by cell-cell communication between the male pollen and female pistil, and many species possess self-incompatibility systems for the selective rejection of self-pollen to maintain genetic diversity. The Brassicaceae self-incompatibility pathway acts early on when pollen grains have landed on the stigmatic papillae at the top of the pistil. Extensive studies have revealed that self-pollen rejection in the Brassicaceae is initiated by an S-haplotype-specific interaction between two polymorphic proteins: the pollen S-locus protein 11/S cysteine-rich (SP11/SCR) ligand and the stigma S receptor kinase (SRK). While the different S-haplotypes are typically codominant, there are several examples of dominant-recessive interactions, and a small RNA-based regulation of SP11/SCR expression has been uncovered as a mechanism behind these genetic interactions. Recent research has also added to our understanding of various cellular components in the pathway leading from the SP11/SCR-SRK interaction, including two signaling proteins, the M-locus protein kinase (MLPK) and the ARM-repeat containing 1 (ARC1) E3 ligase, as well as calcium fluxes and induction of autophagy in the stigmatic papillae. Finally, a better understanding of the compatible pollen responses that are targeted by the self-incompatibility pathway is starting to emerge, and this will allow us to more fully understand how the Brassicaceae self-incompatibility pathway causes self-pollen rejection. Here, we provide an overview of the field, highlighting recent contributions to our understanding of Brassicaceae self-incompatibility, and draw comparisons to a recently discovered unilateral incompatibility system.
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Affiliation(s)
- Eli Jany
- Department of Cell & Systems Biology, University of Toronto, Toronto, ON, Canada
| | - Hayley Nelles
- Department of Cell & Systems Biology, University of Toronto, Toronto, ON, Canada
| | - Daphne R Goring
- Department of Cell & Systems Biology, University of Toronto, Toronto, ON, Canada; Centre for Genome Analysis & Function, University of Toronto, Toronto, ON, Canada
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17
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Li L, Liu B, Deng X, Zhao H, Li H, Xing S, Fetzer DD, Li M, Nasrallah ME, Nasrallah JB, Liu P. Evolution of interspecies unilateral incompatibility in the relatives of Arabidopsis thaliana. Mol Ecol 2018; 27:2742-2753. [PMID: 29717521 DOI: 10.1111/mec.14707] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Revised: 04/07/2018] [Accepted: 04/11/2018] [Indexed: 11/26/2022]
Abstract
The evolutionary concurrence of intraspecies self-incompatibility (SI) and explosive angiosperm radiation in the Cretaceous have led to the hypothesis that SI was one of the predominant drivers of rapid speciation in angiosperms. Interspecies unilateral incompatibility (UI) usually occurs when pollen from a self-compatible (SC) species is rejected by the pistils of a SI species, while the reciprocal pollination is compatible (UC). Although this SI × SC type UI is most prevalent and viewed as a prezygotic isolation barrier to promote incipient speciation of angiosperms, comparative evidence to support such a role is lacking. We show that SI × SI type UI in SI species pairs is also common in the well-characterized accessions representing the four major lineages of the Arabidopsis genus and is developmentally regulated. This allowed us to reveal a strong correlation between UI strength and species divergence in these representative accessions. In addition, analyses of a SC accession and the pseudo-self-compatible (psc) spontaneous mutant of Arabidopsis lyrata indicate that UI shares, at least, common pollen rejection pathway with SI. Furthermore, genetic and genomic analyses of SI × SI type UI in A. lyrata × A. arenosa species pair showed that two major-effect quantitative trait loci are the stigma and pollen-side determinant of UI, respectively, which could be involved in heterospecies pollen discrimination. By revealing a close link between UI and SI pathway, particularly between UI and species divergence in these representative accessions, our findings establish a connection between SI and speciation. Thus, the pre-existence of SI system would have facilitated the evolution of UI and accordingly promote speciation.
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Affiliation(s)
- Ling Li
- Department of Ecology, College of Resources and Environmental Sciences, China Agricultural University, Beijing, China
| | - Bo Liu
- Department of Ecology, College of Resources and Environmental Sciences, China Agricultural University, Beijing, China
| | - Xiaomei Deng
- Beijing Engineering and Technological Research Center of Plant Tissue Culture, Beijing, China
| | - Hainan Zhao
- Department of Ecology, College of Resources and Environmental Sciences, China Agricultural University, Beijing, China
| | - Hongyan Li
- Department of Ecology, College of Resources and Environmental Sciences, China Agricultural University, Beijing, China
| | - Shilai Xing
- Department of Ecology, College of Resources and Environmental Sciences, China Agricultural University, Beijing, China
| | - Della D Fetzer
- Department of Ecology, College of Resources and Environmental Sciences, China Agricultural University, Beijing, China
| | - Mengya Li
- Department of Ecology, College of Resources and Environmental Sciences, China Agricultural University, Beijing, China
| | - Mikhail E Nasrallah
- Section of Plant Biology, School of Integrative Plant Science, Cornell University, Ithaca, New York
| | - June B Nasrallah
- Section of Plant Biology, School of Integrative Plant Science, Cornell University, Ithaca, New York
| | - Pei Liu
- Department of Ecology, College of Resources and Environmental Sciences, China Agricultural University, Beijing, China
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18
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Chantha SC, Herman AC, Castric V, Vekemans X, Marande W, Schoen DJ. The unusual S locus of Leavenworthia is composed of two sets of paralogous loci. THE NEW PHYTOLOGIST 2017; 216:1247-1255. [PMID: 28906557 DOI: 10.1111/nph.14764] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Accepted: 07/25/2017] [Indexed: 05/28/2023]
Abstract
The Leavenworthia self-incompatibility locus (S locus) consists of paralogs (Lal2, SCRL) of the canonical Brassicaceae S locus genes (SRK, SCR), and is situated in a genomic position that differs from the ancestral one in the Brassicaceae. Unexpectedly, in a small number of Leavenworthia alabamica plants examined, sequences closely resembling exon 1 of SRK have been found, but the function of these has remained unclear. BAC cloning and expression analyses were employed to characterize these SRK-like sequences. An SRK-positive Bacterial Artificial Chromosome clone was found to contain complete SRK and SCR sequences located close by one another in the derived genomic position of the Leavenworthia S locus, and in place of the more typical Lal2 and SCRL sequences. These sequences are expressed in stigmas and anthers, respectively, and crossing data show that the SRK/SCR haplotype is functional in self-incompatibility. Population surveys indicate that < 5% of Leavenworthia S loci possess such alleles. An ancestral translocation or recombination event involving SRK/SCR and Lal2/SCRL likely occurred, together with neofunctionalization of Lal2/SCRL, and both haplotype groups now function as Leavenworthia S locus alleles. These findings suggest that S locus alleles can have distinctly different evolutionary origins.
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Affiliation(s)
- Sier-Ching Chantha
- Department of Biology, McGill University, 1205 Avenue Docteur Penfield, Montreal, QC, Canada, H3A1B1
| | - Adam C Herman
- Department of Biology, McGill University, 1205 Avenue Docteur Penfield, Montreal, QC, Canada, H3A1B1
- Department of Plant Biology, University of Minnesota, St Paul, MN, 55108, USA
| | - Vincent Castric
- Unité Evo-Eco-Paléo (EEP) - UMR 8198, CNRS/Université de Lille - Sciences et Technologies, Villeneuve d'Ascq Cedex, F-59655, France
| | - Xavier Vekemans
- Unité Evo-Eco-Paléo (EEP) - UMR 8198, CNRS/Université de Lille - Sciences et Technologies, Villeneuve d'Ascq Cedex, F-59655, France
| | - William Marande
- Institut National de la Recherche Agronomique, 31326, Castanet Tolosan Cedex, France
| | - Daniel J Schoen
- Department of Biology, McGill University, 1205 Avenue Docteur Penfield, Montreal, QC, Canada, H3A1B1
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