Biology Department, Faculty of Science, University of Tabuk, Tabuk 71421, Saudi Arabia.
Biology Department, Faculty of Science, University of Tabuk, Umluj 46429, Saudi Arabia.
Genes (Basel). 2021 Jul 23;12(8):1119. doi: 10.3390/genes12081119.
To assess the effect of triacontanol (TRIA) on rice plants grown under normal or drought conditions, rice seeds were presoaked in TRIA (35 ppm) for two hours. After 20 days of sowing, rice seedlings developed from TRIA-treated or untreated seeds were subjected to drought stress. After 10 days of plant exposure to drought stress, data of major growth attributes and the content of photosynthetic pigments were recorded. Moreover, the effect of drought stress on stomatal conductance and the photochemical efficiency of PSII (Fv/Fm) were followed. The data obtained indicated that the species of rice ( L.) cultivar Giza 177 under investigation was sensitive to drought stress where there were significant decreases in the fresh and dry weights of shoots and roots and in stomatal conductance, as well as in the content of chlorophyll a, chlorophyll b, and carotenoids. Seed priming with TRIA enhanced both growth and acquired plant tolerance to drought stress. Thus, TRIA via the enhancement of stomatal conductance through the regulation of stomatal closure, the rate of water loss, ABA metabolism, the accumulation of osmolytes, and the regulation of aquaporins genes improved the water status of plants grown under water scarcity. Moreover, TRIA via increasing the content of free amino acids and sugars under drought stress may increase the chance of plant tissues to retain more water under scarcity conditions.
为了评估三十烷醇（TRIA）对正常或干旱条件下生长的水稻植株的影响，将水稻种子在 TRIA（35ppm）中浸泡两小时。播种 20 天后，用 TRIA 处理或未处理的种子发育的水稻幼苗受到干旱胁迫。在植物暴露于干旱胁迫 10 天后，记录主要生长属性和光合色素含量的数据。此外，还跟踪了干旱胁迫对气孔导度和 PSII（Fv/Fm）光化学效率的影响。获得的数据表明，所研究的水稻（L.）品种吉萨 177 对干旱胁迫敏感，其中 Shoot 和根的鲜重和干重、气孔导度以及叶绿素 a、叶绿素 b 和类胡萝卜素的含量均显著降低。TRIA 浸种可促进生长并提高植物对干旱胁迫的耐受性。因此，TRIA 通过调节气孔关闭、水分损失率、ABA 代谢、渗透物的积累以及水通道蛋白基因的调节来增强气孔导度，从而改善了在缺水条件下生长的植物的水分状况。此外，TRIA 通过在干旱胁迫下增加游离氨基酸和糖的含量，可能会增加植物组织在稀缺条件下保留更多水分的机会。
