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外源独脚金内酯的应用及其生物合成基因 GhMAX3/GhMAX4b 对棉花（Gossypium hirsutum L.）抗旱性的响应功能。

Functions of exogenous strigolactone application and strigolactone biosynthesis genes GhMAX3/GhMAX4b in response to drought tolerance in cotton (Gossypium hirsutum L.).

机构信息

College of Agronomy, Shandong Agricultural University, NO. 61 Daizong Street, Tai'an, Shandong, 271018, People's Republic of China.

出版信息

BMC Plant Biol. 2024 Oct 26;24(1):1008. doi: 10.1186/s12870-024-05726-w.

DOI:10.1186/s12870-024-05726-w
PMID:39455926
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11515143/
Abstract

BACKGROUND

Drought stress markedly constrains plant growth and diminishes crop productivity. Strigolactones (SLs) exert a beneficial influence on plant resilience to drought conditions. Nevertheless, the specific function of SLs in modulating cotton's response to drought stress remains to be elucidated.

RESULTS

In this study, we assess the impact of exogenous SL (rac-GR24) administration at various concentrations (0, 1, 5, 10, 20 µM) on cotton growth during drought stress. The findings reveal that cotton seedlings treated with 5 µM exogenous SL exhibit optimal mitigation of growth suppression induced by drought stress. Treatment with 5 µM exogenous SL under drought stress conditions enhances drought tolerance in cotton seedlings by augmenting photosynthetic efficiency, facilitating stomatal closure, diminishing reactive oxygen species (ROS) generation, alleviating membrane lipid peroxidation, enhancing the activity of antioxidant enzymes, elevating the levels of osmoregulatory compounds, and upregulating the expression of drought-responsive genes. The suppression of cotton SL biosynthesis genes, MORE AXILLARY GROWTH 3 (GhMAX3) and GhMAX4b, impairs the drought tolerance of cotton. Conversely, overexpression of GhMAX3 and GhMAX4b in respective Arabidopsis mutants ameliorates the drought-sensitive phenotype in these mutants.

CONCLUSION

These observations underscore that SLs significantly bolster cotton's resistance to drought stress.

摘要

背景

干旱胁迫显著限制了植物的生长，降低了作物的生产力。独脚金内酯（SLs）对植物适应干旱条件具有有益影响。然而，SLs 调节棉花对干旱胁迫响应的具体功能仍有待阐明。

结果

在这项研究中，我们评估了不同浓度（0、1、5、10、20 μM）外源 SL（rac-GR24）处理对干旱胁迫下棉花生长的影响。结果表明，用 5 μM 外源 SL 处理的棉花幼苗表现出对干旱胁迫引起的生长抑制的最佳缓解。在干旱胁迫条件下用 5 μM 外源 SL 处理可通过提高光合作用效率、促进气孔关闭、减少活性氧（ROS）生成、减轻膜脂过氧化、增强抗氧化酶活性、提高渗透调节物质水平以及上调干旱响应基因的表达来增强棉花幼苗的耐旱性。棉花 SL 生物合成基因 MORE AXILLARY GROWTH 3（GhMAX3）和 GhMAX4b 的抑制会损害棉花的耐旱性。相反，在各自的拟南芥突变体中过表达 GhMAX3 和 GhMAX4b 可改善这些突变体的干旱敏感表型。

结论

这些观察结果表明，SLs 显著增强了棉花对干旱胁迫的抵抗力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0b56/11515143/c7af4e3f060d/12870_2024_5726_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0b56/11515143/672bdbaa10b8/12870_2024_5726_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0b56/11515143/f51d82906301/12870_2024_5726_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0b56/11515143/0990cc438e70/12870_2024_5726_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0b56/11515143/163dc2492464/12870_2024_5726_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0b56/11515143/9a314371de64/12870_2024_5726_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0b56/11515143/728114415542/12870_2024_5726_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0b56/11515143/c429fe807b43/12870_2024_5726_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0b56/11515143/c7af4e3f060d/12870_2024_5726_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0b56/11515143/672bdbaa10b8/12870_2024_5726_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0b56/11515143/f51d82906301/12870_2024_5726_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0b56/11515143/0990cc438e70/12870_2024_5726_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0b56/11515143/163dc2492464/12870_2024_5726_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0b56/11515143/9a314371de64/12870_2024_5726_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0b56/11515143/728114415542/12870_2024_5726_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0b56/11515143/c429fe807b43/12870_2024_5726_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0b56/11515143/c7af4e3f060d/12870_2024_5726_Fig8_HTML.jpg

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