PDF(Pubmed)
Abstract：
The simultaneous occurrence of high temperature and moisture stress during the reproductive stage of lentil (Lens culinaris Medik) constrains yield potential by disrupting the plant defense system. We studied the detrimental outcomes of heat and moisture stress on rainfed lentils under residual moisture in a field experiment conducted on clay loam soil (Aeric Haplaquept) in eastern India from 2018 to 2019 and from 2019 to 2020 in winter seasons. Lentil was sown on two dates (November and December) to expose the later sowing to higher temperatures and moisture stress. Foliar sprays of boron (0.2% B), zinc (0.5% Zn), and iron (0.5% Fe) were applied individually or in combination at the pre-flowering and pod development stages. High temperatures increased malondialdehyde (MDA) content due to membrane degradation and reduced leaf chlorophyll content, net photosynthetic rate, stomatal conductance, water potential, and yield (kg ha-1). The nutrient treatments affected the growth and physiology of stressed lentil plants. The B+Fe treatment outperformed the other nutrient treatments for both sowing dates, increasing peroxidase (POX) and ascorbate peroxidase (APX) activities, chlorophyll content, net photosynthetic rate, stomatal conductance, relative leaf water content (RLWC), seed filling duration, seed growth rate, and yield per hectare. The B+Fe treatment increased seed yield by 35-38% in late-sown lentils (December). In addition, the micronutrient treatments positively impacted physiological responses under heat and moisture stress with B+Fe and B+Fe+Zn alleviating heat and moisture stress-induced perturbations. Moreover, the exogenous nutrients helped in improving physiochemical attributes, such as chlorophyll content, net photosynthetic rate, stomatal conductance, water potential, seed filling duration, and seed growth rate.
摘要：
小扁豆（LensculinarisMedik）生殖阶段同时发生高温和水分胁迫，会破坏植物防御系统，从而限制产量潜力。我们在2018年至2019年以及2019年至2020年冬季在印度东部的粘土壤土（AericHaplaquept）上进行的田间试验中，研究了在残留水分下雨养小扁豆的热和水分胁迫的有害后果。扁豆在两个日期（11月和12月）播种，以使后来的播种暴露于较高的温度和水分胁迫。硼的叶面喷剂(0.2%B),锌（0.5%锌），和铁（0.5％Fe）在开花前和豆荚发育阶段单独或组合施用。由于膜降解和叶片叶绿素含量降低，高温增加了丙二醛（MDA）含量，净光合速率，气孔导度,水势,和产量(kgha-1)。营养处理影响了受胁迫的小扁豆植物的生长和生理。在两个播期，B+Fe处理的表现都优于其他养分处理，增加过氧化物酶（POX）和抗坏血酸过氧化物酶（APX）活性，叶绿素含量，净光合速率，气孔导度,相对叶片含水量（RLWC），种子灌浆持续时间，种子生长速率,和每公顷产量。BFe处理使播种后期的小扁豆（12月）的种子产量提高了35-38％。此外,微量营养素处理对热量和水分胁迫下的生理反应产生了积极影响，其中BFe和BFeZn缓解了热量和水分胁迫引起的扰动。此外，外源营养素有助于改善理化属性，如叶绿素含量，净光合速率，气孔导度,水势,种子灌浆持续时间，和种子生长速度。
