施用外源绞股蓝内酯和绞股蓝内酯生物合成基因 GhMAX3/GhMAX4b 在棉花（Gossypium hirsutum L.）抗旱中的功能。

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL ACS Applied Energy Materials Pub Date : 2024-10-26 DOI:10.1186/s12870-024-05726-w

Jie Dong, Cong Ding, Huahui Chen, Hailin Fu, Renbo Pei, Fafu Shen, Wei Wang

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引用次数: 0

摘要

背景：干旱胁迫明显限制植物生长，降低作物产量。人参内酯（SLs）对植物的抗旱能力具有有益的影响。然而，SLs 在调节棉花对干旱胁迫的响应方面的具体功能仍有待阐明：本研究评估了不同浓度（0、1、5、10、20 µM）的外源 SL（rac-GR24）对干旱胁迫下棉花生长的影响。研究结果表明，棉花幼苗经 5 µM 外源 SL 处理后，干旱胁迫引起的生长抑制得到了最佳缓解。在干旱胁迫条件下，用 5 µM 外源 SL 处理棉花幼苗可通过提高光合效率、促进气孔关闭、减少活性氧（ROS）生成、减轻膜脂过氧化、增强抗氧化酶的活性、提高渗透调节化合物的水平以及上调干旱响应基因的表达来增强其耐旱性。棉花 SL 生物合成基因 MORE AXILLARY GROWTH 3（GhMAX3）和 GhMAX4b 的抑制会削弱棉花的抗旱能力。相反，在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：这些观察结果表明，SLs 能显著增强棉花对干旱胁迫的抗性。

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

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.

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.