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Dong M, Yin T, Gao J, Zhang H, Yang F, Wang S, Long C, Fu X, Liu H, Guo L, Zhou D. Transcriptome differential expression analysis of defoliation of two different lemon varieties. PeerJ 2024; 12:e17218. [PMID: 38685937 PMCID: PMC11057431 DOI: 10.7717/peerj.17218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Accepted: 03/20/2024] [Indexed: 05/02/2024] Open
Abstract
'Allen Eureka' is a bud variety of Eureka lemon with excellent fruiting traits. However, it suffers from severe winter defoliation that leads to a large loss of organic nutrients and seriously affects the tree's growth and development as well as the yield of the following year, and the mechanism of its response to defoliation is still unclear. In order to investigate the molecular regulatory mechanisms of different leaf abscission periods in lemon, two lemon cultivars ('Allen Eureka' and 'Yunning No. 1') with different defoliation traits were used as materials. The petiole abscission zone (AZ) was collected at three different defoliation stages, namely, the pre-defoliation stage (CQ), the mid-defoliation stage (CZ), and the post-defoliation stage (CH). Transcriptome sequencing was performed to analyze the gene expression differences between these two cultivars. A total of 898, 4,856, and 3,126 differentially expressed genes (DEGs) were obtained in CQ, CZ, and CH, respectively, and the number of DEGs in CZ was the largest. GO analysis revealed that the DEGs between the two cultivars were mainly enriched in processes related to oxidoreductase, hydrolase, DNA binding transcription factor, and transcription regulator activity in the defoliation stages. KEGG analysis showed that the DEGs were concentrated in CZ and involved plant hormone signal transduction, phenylpropanoid biosynthesis, glutathione metabolism, and alpha-linolenic acid metabolism. The expression trends of some DEGs suggested their roles in regulating defoliation in lemon. Eight gene families were obtained by combining DEG clustering analysis and weighted gene co-expression network analysis (WGCNA), including β-glucosidase, AUX/IAA, SAUR, GH3, POD, and WRKY, suggesting that these genes may be involved in the regulation of lemon leaf abscission. The above conclusions enrich the research related to lemon leaf abscission and provide reliable data for the screening of lemon defoliation candidate genes and analysis of defoliation pathways.
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Affiliation(s)
- Meichao Dong
- Institute of Tropical and Subtropical Cash Crops, Yunnan Academy of Agricultural Sciences, Baoshan, China
| | - Tuo Yin
- The Key Laboratory of Biodiversity Conservation of Southwest China, National Forestry and Grassland Administration, College of Forestry, Southwest Forestry University, Kunming, China
| | - Junyan Gao
- Institute of Tropical and Subtropical Cash Crops, Yunnan Academy of Agricultural Sciences, Baoshan, China
| | - Hanyao Zhang
- The Key Laboratory of Biodiversity Conservation of Southwest China, National Forestry and Grassland Administration, College of Forestry, Southwest Forestry University, Kunming, China
| | - Fan Yang
- Institute of Tropical and Subtropical Cash Crops, Yunnan Academy of Agricultural Sciences, Baoshan, China
| | - Shaohua Wang
- Institute of Tropical and Subtropical Cash Crops, Yunnan Academy of Agricultural Sciences, Baoshan, China
| | - Chunrui Long
- Institute of Tropical and Subtropical Cash Crops, Yunnan Academy of Agricultural Sciences, Baoshan, China
| | - Xiaomeng Fu
- Institute of Tropical and Subtropical Cash Crops, Yunnan Academy of Agricultural Sciences, Baoshan, China
| | - Hongming Liu
- Institute of Tropical and Subtropical Cash Crops, Yunnan Academy of Agricultural Sciences, Baoshan, China
| | - Lina Guo
- Institute of Tropical and Subtropical Cash Crops, Yunnan Academy of Agricultural Sciences, Baoshan, China
| | - Dongguo Zhou
- Institute of Tropical and Subtropical Cash Crops, Yunnan Academy of Agricultural Sciences, Baoshan, China
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Ma X, Xie X, He Z, Wang F, Fan R, Chen Q, Zhang H, Huang Z, Wu H, Zhao M, Li J. A LcDOF5.6-LcRbohD regulatory module controls the reactive oxygen species-mediated fruitlet abscission in litchi. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2023; 113:954-968. [PMID: 36587275 DOI: 10.1111/tpj.16092] [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: 10/25/2022] [Revised: 12/22/2022] [Accepted: 12/24/2022] [Indexed: 06/17/2023]
Abstract
Reactive oxygen species (ROS) have been emerging as a key regulator in plant organ abscission. However, the mechanism underlying the regulation of ROS homeostasis in the abscission zone (AZ) is not completely established. Here, we report that a DOF (DNA binding with one finger) transcription factor LcDOF5.6 can suppress the litchi fruitlet abscission through repressing the ROS accumulation in fruitlet AZ (FAZ). The expression of LcRbohD, a homolog of the Arabidopsis RBOHs that are critical for ROS production, was significantly increased during the litchi fruitlet abscission, in parallel with an increased accumulation of ROS in FAZ. In contrast, silencing of LcRbohD reduced the ROS accumulation in FAZ and decreased the fruitlet abscission in litchi. Using in vitro and in vivo assays, we revealed that LcDOF5.6 was shown to inhibit the expression of LcRbohD via direct binding to its promoter. Consistently, silencing of LcDOF5.6 increased the expression of LcRbohD, concurrently with higher ROS accumulation in FAZ and increased fruitlet abscission. Furthermore, the expression of key genes (LcIDL1, LcHSL2, LcACO2, LcACS1, and LcEIL3) in INFLORESCENCE DEFICIENT IN ABSCISSION signaling and ethylene pathways were altered in LcRbohD-silenced and LcDOF5.6-silenced FAZ cells. Taken together, our results demonstrate an important role of the LcDOF5.6-LcRbohD module during litchi fruitlet abscission. Our findings provide new insights into the molecular regulatory network of organ abscission.
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Affiliation(s)
- Xingshuai Ma
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, 510642, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (South China), Ministry of Agriculture and Rural Affairs, College of Horticulture, South China Agricultural University, Guangzhou, 510642, China
- Guangdong Litchi Engineering Research Center, College of Horticulture, South China Agricultural University, Guangzhou, 510642, China
| | - Xianlin Xie
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
- Guangdong Litchi Engineering Research Center, College of Horticulture, South China Agricultural University, Guangzhou, 510642, China
| | - Zidi He
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
- Guangdong Litchi Engineering Research Center, College of Horticulture, South China Agricultural University, Guangzhou, 510642, China
| | - Fei Wang
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
- Guangdong Litchi Engineering Research Center, College of Horticulture, South China Agricultural University, Guangzhou, 510642, China
| | - Ruixin Fan
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
- Guangdong Litchi Engineering Research Center, College of Horticulture, South China Agricultural University, Guangzhou, 510642, China
| | - Qingxin Chen
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
- Guangdong Litchi Engineering Research Center, College of Horticulture, South China Agricultural University, Guangzhou, 510642, China
| | - Hang Zhang
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
- Guangdong Litchi Engineering Research Center, College of Horticulture, South China Agricultural University, Guangzhou, 510642, China
| | - Zhiqiang Huang
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
- Guangdong Litchi Engineering Research Center, College of Horticulture, South China Agricultural University, Guangzhou, 510642, China
| | - Hong Wu
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, 510642, China
| | - Minglei Zhao
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, 510642, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (South China), Ministry of Agriculture and Rural Affairs, College of Horticulture, South China Agricultural University, Guangzhou, 510642, China
- Guangdong Litchi Engineering Research Center, College of Horticulture, South China Agricultural University, Guangzhou, 510642, China
| | - Jianguo Li
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, 510642, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (South China), Ministry of Agriculture and Rural Affairs, College of Horticulture, South China Agricultural University, Guangzhou, 510642, China
- Guangdong Litchi Engineering Research Center, College of Horticulture, South China Agricultural University, Guangzhou, 510642, China
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Cheng L, Li R, Wang X, Ge S, Wang S, Liu X, He J, Jiang CZ, Qi M, Xu T, Li T. A SlCLV3-SlWUS module regulates auxin and ethylene homeostasis in low light-induced tomato flower abscission. THE PLANT CELL 2022; 34:4388-4408. [PMID: 35972422 PMCID: PMC9614458 DOI: 10.1093/plcell/koac254] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 08/03/2022] [Indexed: 06/12/2023]
Abstract
Premature abscission of flowers and fruits triggered by low light stress can severely reduce crop yields. However, the underlying molecular mechanism of this organ abscission is not fully understood. Here, we show that a gene (SlCLV3) encoding CLAVATA3 (CLV3), a peptide hormone that regulates stem cell fate in meristems, is highly expressed in the pedicel abscission zone (AZ) in response to low light in tomato (Solanum lycopersicum). SlCLV3 knockdown and knockout lines exhibit delayed low light-induced flower drop. The receptor kinases SlCLV1 and BARELY ANY MERISTEM1 function in the SlCLV3 peptide-induced low light response in the AZ to decrease expression of the transcription factor gene WUSCHEL (SlWUS). DNA affinity purification sequencing identified the transcription factor genes KNOX-LIKE HOMEDOMAIN PROTEIN1 (SlKD1) and FRUITFULL2 (SlFUL2) as SlWUS target genes. Our data reveal that low light reduces SlWUS expression, resulting in higher SlKD1 and SlFUL2 expression in the AZ, thereby perturbing the auxin response gradient and causing increased ethylene production, eventually leading to the initiation of abscission. These results demonstrate that the SlCLV3-SlWUS signaling pathway plays a central role in low light-induced abscission by affecting auxin and ethylene homeostasis.
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Affiliation(s)
- Lina Cheng
- College of Horticulture, Shenyang Agricultural University, Shenyang, 110866, China
- Key Laboratory of Protected Horticulture of Ministry of Education, Shenyang, China
| | - Ruizhen Li
- College of Horticulture, Shenyang Agricultural University, Shenyang, 110866, China
- Key Laboratory of Protected Horticulture of Ministry of Education, Shenyang, China
| | - Xiaoyang Wang
- College of Horticulture, Shenyang Agricultural University, Shenyang, 110866, China
- Key Laboratory of Protected Horticulture of Ministry of Education, Shenyang, China
| | - Siqi Ge
- College of Horticulture, Shenyang Agricultural University, Shenyang, 110866, China
- Key Laboratory of Protected Horticulture of Ministry of Education, Shenyang, China
| | - Sai Wang
- College of Horticulture, Shenyang Agricultural University, Shenyang, 110866, China
- Key Laboratory of Protected Horticulture of Ministry of Education, Shenyang, China
| | - Xianfeng Liu
- College of Horticulture, Shenyang Agricultural University, Shenyang, 110866, China
- Key Laboratory of Protected Horticulture of Ministry of Education, Shenyang, China
| | - Jing He
- College of Horticulture, Shenyang Agricultural University, Shenyang, 110866, China
- Key Laboratory of Protected Horticulture of Ministry of Education, Shenyang, China
| | - Cai-Zhong Jiang
- Crops Pathology and Genetic Research Unit, United States Department of Agriculture Agricultural Research Service, Albany, California 95616, USA
- Department of Plant Sciences, University of California, Los Angeles, California 95616, USA
| | - Mingfang Qi
- College of Horticulture, Shenyang Agricultural University, Shenyang, 110866, China
- Key Laboratory of Protected Horticulture of Ministry of Education, Shenyang, China
| | - Tao Xu
- College of Horticulture, Shenyang Agricultural University, Shenyang, 110866, China
- Key Laboratory of Protected Horticulture of Ministry of Education, Shenyang, China
| | - Tianlai Li
- College of Horticulture, Shenyang Agricultural University, Shenyang, 110866, China
- Key Laboratory of Protected Horticulture of Ministry of Education, Shenyang, China
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