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Fan W, Tang F, Wang J, Dong J, Xing J, Shi F. Drought-induced recruitment of specific root-associated bacteria enhances adaptation of alfalfa to drought stress. Front Microbiol 2023; 14:1114400. [PMID: 36910228 PMCID: PMC9995459 DOI: 10.3389/fmicb.2023.1114400] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 02/06/2023] [Indexed: 02/25/2023] Open
Abstract
Drought is a major abiotic stress that threatens crop production. Soil microbiomes are thought to play a role in enhancing plant adaptation to various stresses. However, it remains unclear whether soil microbiomes play a key role when plants are challenged by drought and whether different varieties are enriched with specific bacteria at the rhizosphere. In this study, we measured changes in growth phenotypes, physiological and biochemical characteristics of drought-tolerant alfalfa (AH) and drought-sensitive (QS) under sterilized and unsterilized soil conditions with adequate watering and with drought stress, and analyzed the rhizosphere bacterial community composition and changes using 16S rRNA high-throughput sequencing. We observed that the unsterilized treatment significantly improved the growth, and physiological and biochemical characteristics of alfalfa seedlings under drought stress compared to the sterilized treatment. Under drought stress, the fresh and dry weight of seedlings increased by 35.24, 29.04, and 11.64%, 2.74% for unsterilized AH and QS, respectively, compared to sterilized treatments. The improvement was greater for AH than for QS. AH and QS recruited different rhizosphere bacteria when challenged by drought. Interestingly, under well-watered conditions, the AH rhizosphere was already rich in drought-tolerant bacterial communities, mainly Proteobacteria and Bacteroidetes, whereas these bacteria started to increase only when QS was subjected to drought. When drought stress was applied, AH was enriched with more drought-tolerant bacteria, mainly Acidobacteria, while the enrichment was weaker in QS rhizosphere. Therefore, the increase in drought tolerance of the drought-tolerant variety AH was greater than that of the drought-sensitive variety QS. Overall, this study confirmed the key role of drought-induced rhizosphere bacteria in improving the adaptation of alfalfa to drought stress, and clarified that this process is significantly related to the variety (genotype). The results of this study provide a basis for improving drought tolerance in alfalfa by regulating the rhizosphere microbiome.
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Affiliation(s)
- Wenqiang Fan
- Key Laboratory of Grassland Resources of the Ministry of Education and Key Laboratory of Forage Cultivation, Processing and High-Efficiency Utilization of the Ministry of Agriculture, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot, China
| | - Fang Tang
- Key Laboratory of Grassland Resources of the Ministry of Education and Key Laboratory of Forage Cultivation, Processing and High-Efficiency Utilization of the Ministry of Agriculture, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot, China
| | - Jiani Wang
- Key Laboratory of Grassland Resources of the Ministry of Education and Key Laboratory of Forage Cultivation, Processing and High-Efficiency Utilization of the Ministry of Agriculture, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot, China
| | - Jiaqi Dong
- Key Laboratory of Grassland Resources of the Ministry of Education and Key Laboratory of Forage Cultivation, Processing and High-Efficiency Utilization of the Ministry of Agriculture, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot, China
| | - Jing Xing
- Key Laboratory of Grassland Resources of the Ministry of Education and Key Laboratory of Forage Cultivation, Processing and High-Efficiency Utilization of the Ministry of Agriculture, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot, China
| | - Fengling Shi
- Key Laboratory of Grassland Resources of the Ministry of Education and Key Laboratory of Forage Cultivation, Processing and High-Efficiency Utilization of the Ministry of Agriculture, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot, China
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2
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Sarkar AK, Sadhukhan S. Imperative role of trehalose metabolism and trehalose-6-phosphate signaling on salt stress responses in plants. PHYSIOLOGIA PLANTARUM 2022; 174:e13647. [PMID: 35141895 DOI: 10.1111/ppl.13647] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 01/23/2022] [Accepted: 02/07/2022] [Indexed: 05/04/2023]
Abstract
Sugar transport and distribution have a direct impact on the growth and development of plants. Many sugars significantly influence salt stress response. The sensing of salt stress signals triggers a wide array of complicated network transduction pathways in plants. Trehalose and its intermediate compounds effectively modulate salt response and salt tolerance. Sugars such as trehalose and its derivatives not only serve as metabolic resources and structural components of cells in plants but also exhibit hormone-like regulating properties. Trehalose has an important physiological role in improving plant tolerance against salinity stresses in different plants. Plants finely adjust their cytoplasmic compatible solute pool to cope with high salinity. Salt stress induces a variety of structural, anatomical, molecular, biochemical, and physiological changes in plants, all of which have a detrimental influence on plant growth and development. This review highlights the recent developments in understanding trehalose and trehalose-6-phosphate signaling processes in plants, especially their impacts on plants growing in salty environments.
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Affiliation(s)
- Anup Kumar Sarkar
- Department of Botany, Dukhulal Nibaran Chandra College, Murshidabad, West Bengal, India
- Plant Molecular Biology Laboratory, Department of Botany, Raiganj University, Raiganj, West Bengal, India
| | - Sanjoy Sadhukhan
- Plant Molecular Biology Laboratory, Department of Botany, Raiganj University, Raiganj, West Bengal, India
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3
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Liu Q, Xie S, Zhao X, Liu Y, Xing Y, Dao J, Wei B, Peng Y, Duan W, Wang Z. Drought Sensitivity of Sugarcane Cultivars Shapes Rhizosphere Bacterial Community Patterns in Response to Water Stress. Front Microbiol 2021; 12:732989. [PMID: 34745035 PMCID: PMC8568056 DOI: 10.3389/fmicb.2021.732989] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 09/16/2021] [Indexed: 12/13/2022] Open
Abstract
Rhizosphere bacteria, the main functional microorganisms inhabiting the roots of terrestrial plants, play important roles in regulating plant growth and environmental stress resistance. However, limited information is available regarding changes occurring within the structure of the root microbial community and the response mechanisms of host plants that improve adaptability to drought stress. In this study, we conducted an experiment on two sugarcane varieties with different drought tolerance levels under drought and control treatments and analyzed the rhizosphere bacterial communities using 16S rRNA high-throughput sequencing. Correlation analysis results clarified the influence of various factors on the rhizosphere bacterial community structure. Drought stress reduced the diversity of the bacterial community in the rhizosphere of sugarcane. Interestingly, the bacterial community of the drought-sensitive sugarcane cultivar GT39 changed more than that of the drought-tolerant cultivar ZZ9. In addition, ZZ9 had a high abundance of drought-resistant bacteria in the rhizosphere under optimal soil water conditions, whereas GT39 accumulated a large number of drought-resistant bacteria only under drought stress. GT39 mainly relied on Actinobacteria in its response to drought stress, and the abundance of this phylum was positively correlated with soil acid phosphatase and protease levels. In contrast, ZZ9 mainly relied on Bacilli in its response to drought stress, and the abundance of this class was positively correlated with only soil acid phosphatase levels. In conclusion, drought stress can significantly reduce the bacterial diversity and increase the abundance of drought-resistant bacteria in the sugarcane rhizosphere. The high abundance of drought-resistant bacteria in the rhizosphere of drought-tolerant cultivars under non-drought conditions is an important factor contributing to the high drought adaptability of these cultivars. Moreover, the core drought-resistant bacteria of the sugarcane rhizosphere and root exudates jointly affect the resistance of sugarcane to drought.
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Affiliation(s)
- Qi Liu
- Guangxi Key Laboratory of Sugarcane Biology, Nanning, China.,State Key Laboratory for Conservation & Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, China.,College of Agronomy, Guangxi University, Nanning, China
| | - Sasa Xie
- Guangxi Key Laboratory of Sugarcane Biology, Nanning, China.,State Key Laboratory for Conservation & Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, China.,College of Agronomy, Guangxi University, Nanning, China
| | - Xiaowen Zhao
- Guangxi Key Laboratory of Sugarcane Biology, Nanning, China.,State Key Laboratory for Conservation & Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, China.,College of Agronomy, Guangxi University, Nanning, China
| | - Yue Liu
- Guangxi Key Laboratory of Sugarcane Biology, Nanning, China.,State Key Laboratory for Conservation & Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, China.,College of Agronomy, Guangxi University, Nanning, China
| | - Yuanjun Xing
- Guangxi Key Laboratory of Sugarcane Biology, Nanning, China.,State Key Laboratory for Conservation & Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, China.,College of Agronomy, Guangxi University, Nanning, China
| | - Jicao Dao
- Guangxi Key Laboratory of Sugarcane Biology, Nanning, China.,State Key Laboratory for Conservation & Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, China.,College of Agronomy, Guangxi University, Nanning, China
| | - Beilei Wei
- Guangxi Key Laboratory of Sugarcane Biology, Nanning, China.,State Key Laboratory for Conservation & Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, China.,College of Agronomy, Guangxi University, Nanning, China
| | - Yunchang Peng
- Guangxi Key Laboratory of Sugarcane Biology, Nanning, China.,State Key Laboratory for Conservation & Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, China.,College of Agronomy, Guangxi University, Nanning, China
| | - Weixing Duan
- Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Ziting Wang
- Guangxi Key Laboratory of Sugarcane Biology, Nanning, China.,State Key Laboratory for Conservation & Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, China.,College of Agronomy, Guangxi University, Nanning, China
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4
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Breeding drought‐ and stress‐resistant crops. FOOD SCIENCE AND TECHNOLOGY 2019. [DOI: 10.1002/fsat.3104_5.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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5
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Li B, Liu G, Wang Y, Wei Y, Shi H. Overexpression of Banana ATG8f Modulates Drought Stress Resistance in Arabidopsis. Biomolecules 2019; 9:biom9120814. [PMID: 31810306 PMCID: PMC6995610 DOI: 10.3390/biom9120814] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 11/28/2019] [Accepted: 11/28/2019] [Indexed: 12/13/2022] Open
Abstract
Autophagy is essential for plant growth, development, and stress resistance. However, the involvement of banana autophagy-related genes in drought stress response and the underlying mechanism remain elusive. In this study, we found that the transcripts of 10 banana ATG8s responded to drought stress in different ways, and MaATG8f with the highest transcript in response to drought stress among them was chosen for functional analysis. Overexpression of MaATG8f improved drought stress resistance in Arabidopsis, with lower malonaldehyde level and higher level of assimilation rate. On the one hand, overexpression of MaATG8f activated the activities of superoxide dismutase, catalase, and peroxidase under drought stress conditions, so as to regulate reactive oxygen species accumulation. On the other hand, MaATG8f-overexpressing lines exhibited higher endogenous abscisic acid (ABA) level and more sensitivity to abscisic acid. Notably, the autophagosomes as visualized by CaMV35S::GFP–MaATG8f was activated after ABA treatment. Taken together, overexpression of MaATG8f positively regulated plant drought stress resistance through modulating reactive oxygen species metabolism, abscisic acid biosynthesis, and autophagic activity.
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Affiliation(s)
- Bing Li
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Tropical Crops, Hainan University, Haikou 570228, China; (B.L.); (G.L.)
| | - Guoyin Liu
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Tropical Crops, Hainan University, Haikou 570228, China; (B.L.); (G.L.)
- College of Forestry, Hainan University, Haikou 570228, China;
| | - Yuqi Wang
- College of Forestry, Hainan University, Haikou 570228, China;
| | - Yunxie Wei
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Tropical Crops, Hainan University, Haikou 570228, China; (B.L.); (G.L.)
- Correspondence: (Y.W.); (H.S.); Tel.: +86-898-6616-0721 (Y.W. & H.S.)
| | - Haitao Shi
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Tropical Crops, Hainan University, Haikou 570228, China; (B.L.); (G.L.)
- Correspondence: (Y.W.); (H.S.); Tel.: +86-898-6616-0721 (Y.W. & H.S.)
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6
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Water scarcity impacts on global food production. GLOBAL FOOD SECURITY-AGRICULTURE POLICY ECONOMICS AND ENVIRONMENT 2019. [DOI: 10.1016/j.gfs.2019.07.007] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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7
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Ding X, Zeng J, Huang L, Li X, Song S, Pei Y. Senescence-induced expression of ZmSUT1 in cotton delays leaf senescence while the seed coat-specific expression increases yield. PLANT CELL REPORTS 2019; 38:991-1000. [PMID: 31069498 DOI: 10.1007/s00299-019-02421-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 04/29/2019] [Indexed: 05/16/2023]
Abstract
Sink-specific expression of a sucrose transporter protein gene from the C4 plant maize can promote carbohydrate accumulation in target tissues and increase both fiber and seed yield of cotton. Sucrose is the principal form of photosynthetic products transported from source tissue to sink tissue in higher plants. Enhancing the partition of carbohydrate to the target organ is a promising way to improve crop productivity. The C4 plant Zea mays exhibits a substantially higher rate of export of photosynthates than many C3 plants, and its sucrose transporter protein ZmSut1 displays important role in sucrose allocation. To investigate how use of ZmSUT1 gene to increase the fiber and seed yield of cotton, in this study, we expressed the gene in cotton under a senescence-inducible promoter PSAG12 and a seed coat-specific promoter BAN, respectively. We show that senescence-induced expression of ZmSUT1 results in an increase of sugar accumulation in leaves. Although the leaf senescence was postponed in PSAG12::ZmSUT1 cotton, the photosynthetic rate of the leaves was decreased. In contrast, seed coat-specific expression of the gene leads to an increase of sugar accumulation in fibers and bolls, and the leaf of transgenic BAN::ZmSUT1 cotton displayed higher photosynthetic capacity than the wild type. Importantly, both fiber and seed yield of transgenic BAN::ZmSUT1 cotton are significantly enhanced. Our data indicate the potential of enhancing yield of carbohydrate crops by the regulation of sugar partitioning.
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Affiliation(s)
- Xiaoyan Ding
- Biotechnology Research Center, Southwest University, No. 2 Tiansheng Rd., Beibei, Chongqing, 400716, People's Republic of China
| | - Jianyan Zeng
- Biotechnology Research Center, Southwest University, No. 2 Tiansheng Rd., Beibei, Chongqing, 400716, People's Republic of China
| | - Liang Huang
- Biotechnology Research Center, Southwest University, No. 2 Tiansheng Rd., Beibei, Chongqing, 400716, People's Republic of China
| | - Xianbi Li
- Biotechnology Research Center, Southwest University, No. 2 Tiansheng Rd., Beibei, Chongqing, 400716, People's Republic of China
| | - Shuiqing Song
- Biotechnology Research Center, Southwest University, No. 2 Tiansheng Rd., Beibei, Chongqing, 400716, People's Republic of China
| | - Yan Pei
- Biotechnology Research Center, Southwest University, No. 2 Tiansheng Rd., Beibei, Chongqing, 400716, People's Republic of China.
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8
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Nuccio ML, Paul M, Bate NJ, Cohn J, Cutler SR. Where are the drought tolerant crops? An assessment of more than two decades of plant biotechnology effort in crop improvement. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2018; 273:110-119. [PMID: 29907303 DOI: 10.1016/j.plantsci.2018.01.020] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 01/29/2018] [Accepted: 01/31/2018] [Indexed: 05/22/2023]
Abstract
Since the dawn of modern biotechnology public and private enterprise have pursued the development of a new breed of drought tolerant crop products. After more than 20 years of research and investment only a few such products have reached the market. This is due to several technical and market constraints. The technical challenges include the difficulty in defining tractable single-gene trait development strategies, the logistics of moving traits from initial to commercial genetic backgrounds, and the disconnect between conditions in farmer's fields and controlled environments. Market constraints include the significant difficulty, and associated costs, in obtaining access to markets around the world. Advances in the biology of plant water management, including response to water deficit reveal new opportunities to improve crop response to water deficit and new genome-based tools promise to usher in the next era of crop improvement. As biotechnology looks to improve crop productivity under drought conditions, the environmental and food security advantages will influence public perception and shift the debate toward benefits rather than risks.
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Affiliation(s)
- Michael L Nuccio
- Syngenta Crop Protection, LLC., 9 Davis Drive, Research Triangle Park, NC, 27709, USA.
| | - Matthew Paul
- Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, UK.
| | - Nicholas J Bate
- Syngenta Crop Protection, LLC., 9 Davis Drive, Research Triangle Park, NC, 27709, USA.
| | - Jonathan Cohn
- Syngenta Crop Protection, LLC., 9 Davis Drive, Research Triangle Park, NC, 27709, USA.
| | - Sean R Cutler
- Plant Cell Biology and Chemistry, Botany and Plant Sciences Chemistry Genomics Building, University of California Riverside, CA, 92521, USA.
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9
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Turc O, Tardieu F. Drought affects abortion of reproductive organs by exacerbating developmentally driven processes via expansive growth and hydraulics. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:3245-3254. [PMID: 29546424 DOI: 10.1093/jxb/ery078] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 02/21/2018] [Indexed: 05/18/2023]
Abstract
Abortion of reproductive organs is a major limiting factor of yield under water deficit, but is also a trait selected for by evolutionary processes. The youngest reproductive organs must be prone to abortion so older organs can finish their development in case of limited resources. Water deficit increases natural abortion via two developmentally driven processes, namely a signal from the first fertilized ovaries and a simultaneous arrest of the expansive growth of all ovaries at a precise stage. In maize (Zea mays) subjected to water deficits typically encountered in dryland agriculture, these developmental mechanisms account for 90% of drought-associated abortion and are irreversible 3 d after silk emergence. Consistently, transcripts and enzyme activities suggest that the molecular events associated with abortion affect expansive growth in silks whereas ovaries maintain a favourable carbon status. Abortion due to carbon starvation is only observed for severe drought scenarios occurring after silking. Both kinetic and genetic evidence indicates that vegetative and reproductive structures share a partly common hydraulic control of expansive growth. Hence, the control of expansive growth of reproductive structures probably has a prominent effect on abortion for mild water deficits occurring at flowering time, while carbon starvation dominates in severe post-flowering drought scenarios.
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Affiliation(s)
- Olivier Turc
- LEPSE, INRA, Montpellier SupAgro, Univ Montpellier, Montpellier, France
| | - François Tardieu
- LEPSE, INRA, Montpellier SupAgro, Univ Montpellier, Montpellier, France
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