CCS Haryana Agricultural University, Hisar-125004, India.
Indian Council of Agricultural Research, New Delhi-110012, India.
Appl Biochem Biotechnol. 2023 Jan;195(1):693-721. doi: 10.1007/s12010-022-04085-2. Epub 2022 Aug 20.
Agricultural productivity is negatively impacted by drought stress. Brassica is an important oilseed crop, and its productivity is often limited by drought. Biostimulants are known for their role in plant growth promotion, increased yields, and tolerance to environmental stresses. Silicon in its soluble form of orthosilicic acid (OSA) has been established to alleviate deteriorative effects of drought. Seaweed extract (SWE) also positively influence plant survival and provide dehydration tolerance under stressed environments. The present study was conducted to evaluate the efficacy of OSA and SWE on mitigating adverse effects of drought stress on Brassica genotype RH-725. Foliar application of OSA (2 ml/L and 4 ml/L) and SWE of Ascophyllum nodosum (3 ml/L and 4 ml/L) in vegetative stages in Brassica variety RH 725 under irrigated and rainfed condition revealed an increase in photosynthetic rate, stomatal conductance, transpirational rate, relative water content, water potential, osmotic potential, chlorophyll fluorescence, chlorophyll stability index, total soluble sugars, total protein content, and antioxidant enzyme activity; and a decrease in canopy temperature depression, proline, glycine-betaine, HO, and MDA content. Application of 2 ml/L OSA and 3 ml/L SWE at vegetative stage presented superior morpho-physiological and biochemical characteristics and higher yields. The findings of the present study will contribute to developing a sustainable cropping system by harnessing the benefits of OSA and seaweed extract as stress mitigators.
干旱胁迫会对农业生产力产生负面影响。芸薹属作物是一种重要的油料作物，其生产力常受到干旱的限制。生物刺激素在促进植物生长、提高产量和增强对环境胁迫的耐受性方面具有重要作用。已证实，可溶性硅（以正硅酸形式存在，简称 OSA）可减轻干旱对作物的不利影响。海藻提取物（SWE）也可积极影响植物的生存能力，并在胁迫环境下提供耐旱性。本研究旨在评估 OSA 和 SWE 对缓解 RH-725 芸薹属基因型干旱胁迫不良影响的效果。在灌溉和雨养条件下，于芸薹属品种 RH 725 的营养生长阶段，叶面喷施 OSA（2 ml/L 和 4 ml/L）和 A. nodosum 海藻提取物（3 ml/L 和 4 ml/L），结果表明：光合速率、气孔导度、蒸腾速率、相对含水量、水势、渗透势、叶绿素荧光、叶绿素稳定性指数、总可溶性糖、总蛋白含量和抗氧化酶活性均增加；冠层温度下降、脯氨酸、甘氨酸甜菜碱、HO 和 MDA 含量降低。在营养生长阶段，喷施 2 ml/L OSA 和 3 ml/L SWE 表现出更好的形态、生理和生化特性以及更高的产量。本研究结果将有助于通过利用 OSA 和海藻提取物作为胁迫缓解剂来开发可持续的种植系统。
