Universidade Estadual do Norte Fluminense Darcy Ribeiro - UENF, Departamento de Agronomia, Campos dos Goytacazes, RJ, Brasil.
Instituto Federal de Educação, Ciência e Tecnologia do Amapá - IFAP, Campus Agrícola Porto Grande, Macapá, AP, Brasil.
Braz J Biol. 2024 May 31;84:e281457. doi: 10.1590/1519-6984.281457. eCollection 2024.
Cowpea is a leguminous plant belonging to the fabaceae family cultivated in the North and Northeast regions of Brazil, with productive potential. Among the abiotic factors, water deficiency is one of the main environmental limitations that influence agricultural production in the world. The objective of this work was to study the relative water content and osmoregulators of cowpea plants subjected to water stress. The experiment was carried out in a greenhouse at the Universidade Federal Rural da Amazônia (UFRA, Belém, PA), cowpea plants BR-17 Gurguéia Vigna unguiculata (L.) Walp were used. The experimental design was completely randomized (DIC) in a 2 × 2 factorial scheme, two water conditions (control and water deficit) and two times of stress (four and six days of water suspension), with 7 replications, totaling 28 experimental units. The water deficit affected plants, causing a reduction in relative water content (69.98%), starch (12.84% in leaves and 23.48% in roots) and carbohydrates (84.34%), and an increase in glycine-betaine, sucrose (114.11% in leaves and 18.71% in roots) and proline (358.86%) at time 2. The relative water content was negatively affected by water conditions, with a decrease in relation to the interaction of the aerial part and the root system. Therefore, greater metabolic responses were noted in plants that were subjected to stress treatment at time 2 (6 days).
菜豆是豆科植物，属于豇豆属，在巴西的北部和东北部地区种植，具有较高的生产力。在非生物因素中，水分亏缺是影响世界农业生产的主要环境限制因素之一。本工作的目的是研究水分胁迫下菜豆植物的相对含水量和渗透调节剂。该实验在亚马逊联邦农村大学（UFRA，贝伦，PA）的温室中进行，使用了 BR-17 Gurguéia 菜豆植物 Vigna unguiculata（L.）Walp。实验设计采用完全随机（DIC）设计，在 2×2 析因方案中，有两种水分条件（对照和水分亏缺）和两种胁迫时间（水分暂停四天和六天），有 7 个重复，共计 28 个实验单位。水分亏缺影响了植物，导致相对含水量（叶片 69.98%，根系 69.98%）、淀粉（叶片 12.84%，根系 23.48%）和碳水化合物（84.34%）减少，甘氨酸甜菜碱、蔗糖（叶片 114.11%，根系 18.71%）和脯氨酸（358.86%）增加。水分条件对相对含水量有负面影响，与地上部分和根系的相互作用有关，相对含水量下降。因此，在 2 时间点（6 天）进行胁迫处理的植物表现出更大的代谢响应。
