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Seed Priming and Its Role in Mitigating Heat Stress Responses in Crop Plants
Journal of Soil Science and Plant Nutrition ( IF 3.9 ) Pub Date : 2021-04-27 , DOI: 10.1007/s42729-021-00474-4
Payal Chakraborty , Padmanabh Dwivedi

Rise in temperature beyond threshold level that causes irreversible damage in plants is heat stress while heat stress during reproductive or grain filling period is regarded as terminal heat stress. Heat stress significantly alters plant growth and metabolic activities and makes them struggle for survival. Terminal heat stress obstructs growth and development of crops by disturbing their physiological and biochemical progressions of reproductive stages like grain/pod filling, their development, maturation, ripening and ultimately conferring yield loss. However, one of the easiest and low-priced advanced techniques to diminish this loss is seed priming. In this technique, seeds are soaked in different nutrient-enriched solutions to improve their quality for establishing uniform and rapid seed germination, resulting in healthy and vigorous seedlings. This method of seed soaking elicits pre-germinative metabolic responses inside seed that leads to early germination and fastens crop establishment process. Various priming techniques have been adapted that include hydropriming, halopriming, osmopriming, sand matric priming and nutripriming (priming with water, salt, osmoticum, moist sand and nutrient). Seed priming has an important role to alleviate terminal heat stress by inducing the activity of many enzymes during pre-soaking period as various enzymes require hydration energy for activation. Seed priming also sometimes increases production and activity of heat shock proteins (HSPs) and molecular chaperones to ensure proper protein folding and prevent protein denaturation during heat stress condition. Despite positive responses of various seed priming techniques, these have been less applied in the area of crop production in the field condition. Considering these facts, this review depicts responses of the plants under heat stress and its management through seed priming techniques, especially under field condition, and to associate the same with enhanced crop production under the stressful situations.



中文翻译:

种子引发及其在减轻作物热应激反应中的作用

温度升高超过导致植物不可逆转损害的阈值水平是热胁迫,而生殖或谷物灌浆期的热胁迫被认为是最终的热胁迫。热应激会显着改变植物的生长和代谢活动,并使它们为生存而挣扎。终末热应激通过扰乱作物如谷物/荚果的充实,发育,成熟,成熟并最终导致产量损失的生理和生化进程,阻碍了作物的生长和发育。但是,减少这种损失的最简单,价格最便宜的先进技术之一就是种子灌底。在该技术中,将种子浸泡在不同的营养丰富的溶液中,以提高种子质量,以建立均匀而快速的种子发芽,从而使幼苗健康有力。这种浸种方法会在种子内部引发发芽前的代谢反应,从而导致早期发芽并加快农作物的建立过程。已经采用了各种底漆技术,包括加水底漆,晕轮底漆,渗透压底漆,沙基底漆底涂和营养底漆(用水,盐,渗透压剂,湿沙和养分底漆底涂)。由于多种酶需要水合能量来活化,因此在预浸期间通过引发许多酶的活性,种子引发对减轻终端热应激具有重要作用。引发种子有时还可以增加热激蛋白(HSP)和分子伴侣的产生和活性,以确保适当的蛋白折叠并在热应激条件下防止蛋白变性。尽管各种种子启动技术都做出了积极回应,这些在田间条件下在作物生产领域的应用较少。考虑到这些事实,本综述描述了植物在热胁迫下的反应及其通过种子引发技术的管理,特别是在田间条件下的管理,并将其与在胁迫情况下提高作物产量联系起来。

更新日期:2021-04-28
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