Plant Production Department, School of Agriculture, UNESP-São Paulo State University, Campus Botucatu, Ave. Universitária, n° 3780-Altos do Paraíso, Botucatu, São Paulo, 18610-034, Brazil.
Biodiversity and Biostatistics Department, Institute of Biosciences, UNESP-São Paulo State University, Campus Botucatu, Street Prof. Dr. Antonio Celso Wagner Zanin, 250-District de Rubião Junior, Botucatu, São Paulo, 18618-689, Brazil.
Sci Rep. 2023 Aug 11;13(1):13059. doi: 10.1038/s41598-023-40388-y.
The current climate change setting necessitates the development of methods to mitigate the effects of water scarcity to ensure the sustainability of agricultural activities.f Hydrogen peroxide (HO) is a plant signaling molecule that can trigger metabolic defense mechanisms in response to adverse environmental circumstances like as drought. The purpose of this study was to investigate if foliar application of HO stimulates modifications in photosynthetic metabolism for adaptation of tomato plants to a period of water deficit and recovery. The study, which was carried out in a factorial scheme, tested plants subjected to two water conditions (well-watered plants and plants subjected to water deficit), as well as foliar application of 1 mM HO (zero, one, or two applications, 24 h after the first), and was evaluated in two moments, during the deficit period and after recovery. Foliar application of 1 mM HO resulted in a 69% increase in the maximum rate of RuBisCO carboxylation in well-watered plants, contributing to tomato photosynthetic adjustment. HO treatment resulted in a 37% increase in dry mass in these plants. In plants subjected to water deficiency, 2× HO increased stress tolerance by reducing the maximal rate of RuBisCO carboxylation by only 18%, but in plants that did not receive HO treatment, the reduction was 86% in comparison to the wet plants. Plants exposed to a water shortage and given 2× HO stored sucrose in the leaves and had a 17% higher relative water content than plants not given HO. Thus, HO foliar treatment can be used in tomato management to induce drought tolerance or to boost photosynthetic activity and dry mass formation in well-watered plants.
当前的气候变化形势需要开发方法来减轻水资源短缺的影响，以确保农业活动的可持续性。过氧化氢 (HO) 是一种植物信号分子，它可以触发代谢防御机制，以应对干旱等不利的环境情况。本研究旨在探讨叶面喷施 HO 是否能刺激番茄植株的光合作用代谢发生变化，以适应一段时间的水分亏缺和恢复。该研究采用析因设计进行，测试了两种水分条件下的植物（水分充足的植物和水分亏缺的植物），以及叶面喷施 1mM HO（零、一或两次，第一次后 24 小时），并在两个时期进行评估，即亏缺期间和恢复后。叶面喷施 1mM HO 可使水分充足的植物的 RuBisCO 羧化最大速率提高 69%，有助于番茄的光合作用调节。HO 处理使这些植物的干重增加了 37%。在水分亏缺的植物中，2×HO 通过将 RuBisCO 羧化的最大速率仅降低 18%来提高胁迫耐受性，但在未接受 HO 处理的植物中，与水分充足的植物相比，降低了 86%。暴露于水分亏缺并接受 2×HO 的植物在叶片中储存了蔗糖，相对含水量比未接受 HO 的植物高 17%。因此，叶面喷施 HO 可以用于番茄管理，以诱导耐旱性或提高水分充足的植物的光合作用活性和干物质形成。
