Desoky El-Sayed M, Mansour Elsayed, El-Sobky El-Sayed E A, Abdul-Hamid Mohamed I, Taha Taha F, Elakkad Hend A, Arnaout Safaa M A I, Eid Rania S M, El-Tarabily Khaled A, Yasin Mohamed A T
Botany Department, Faculty of Agriculture, Zagazig University, Zagazig, Egypt.
Agronomy Department, Faculty of Agriculture, Zagazig University, Zagazig, Egypt.
Front Plant Sci. 2021 Sep 16;12:637783. doi: 10.3389/fpls.2021.637783. eCollection 2021.
Nano-silicon application is an efficient novel approach to mitigate the deleterious impacts of drought stress on field crops, which is expected to increase owing to climate change, especially in arid regions. Two-season field studies investigated the influence of foliar-applied nano-silicon (0.5, 1, and 1.5 mM) on physiological and biochemical attributes and their impacts on crop water productivity (CWP) and the agronomic traits of faba beans (). The plants were evaluated under two irrigation regimes: well-watered (100% ETc giving 406 mm ha) and drought stress (65% ETc giving 264 mm ha). It was found that drought stress significantly decreased gas exchange (leaf net photosynthetic rate, stomatal conductance, and rate of transpiration), water relations (relative water content and membrane stability index), nutrient uptake (N, P, K, and Ca), flavonoids, and phenolic content. In contrast, drought stress significantly increased oxidative stress (HO and ) and enzymatic and non-enzymatic antioxidant activities compared with the well-watered treatment. These influences of drought stress were negatively reflected in seed yield-related traits and CWP. However, foliar treatment with nano-silicon, particularly with 1.5 mM, limited the devastating impact of drought stress and markedly enhanced all the aforementioned parameters. Therefore, exogenously applied nano-silicon could be used to improve the CWP and seed and biological yields of faba bean plants under conditions with low water availability in arid environments.
纳米硅的应用是一种减轻干旱胁迫对大田作物有害影响的有效新方法，由于气候变化，预计这种影响会增加，特别是在干旱地区。两季田间研究调查了叶面喷施纳米硅（0.5、1和1.5 mM）对蚕豆生理生化特性的影响及其对作物水分生产率（CWP）和农艺性状的影响。在两种灌溉制度下对植株进行评估：充分灌溉（100%作物需水量，即406毫米/公顷）和干旱胁迫（65%作物需水量，即264毫米/公顷）。结果发现，干旱胁迫显著降低了气体交换（叶片净光合速率、气孔导度和蒸腾速率）、水分关系（相对含水量和膜稳定性指数）、养分吸收（氮、磷、钾和钙）、类黄酮和酚类含量。相比之下，与充分灌溉处理相比，干旱胁迫显著增加了氧化应激（过氧化氢和超氧阴离子）以及酶促和非酶促抗氧化活性。干旱胁迫的这些影响对种子产量相关性状和CWP产生了负面影响。然而，叶面喷施纳米硅，特别是1.5 mM的纳米硅，限制了干旱胁迫的破坏性影响，并显著提高了所有上述参数。因此，在干旱环境中水分供应不足的条件下，外源施用纳米硅可用于提高蚕豆植株的CWP以及种子产量和生物产量。
