Effects of Nitrogen Supply on Water Stress and Recovery Mechanisms in Kentucky Bluegrass Plants.
Effects of Nitrogen Supply on Water Stress and Recovery Mechanisms in Kentucky Bluegrass Plants.
复制标题
氮供应对早熟禾植物水分胁迫及恢复机制的影响
DOI：
10.3389/fpls.2017.00983
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发表时间：
2017
影响因子：
5.6
通讯作者：
Alharby H
中科院分区：
文献类型：
--
作者：
Saud S;Fahad S;Yajun C;Ihsan MZ;Hammad HM;Nasim W;Amanullah Jr;Arif M;Alharby H
温带地区的非灌溉作物和干旱地区的灌溉作物面临着一系列持续不断的干旱压力和重新浇水。因此，快速有效地从干旱胁迫中恢复可能是植物干旱调整的关键决定因素之一。有效的氮（N）营养有能力缓解作物的水分胁迫，即使在组织水势降低的情况下也能维持代谢活动。本研究旨在通过对干旱胁迫下肯塔基州早熟禾的形态、生理特征和氮素同化的研究，了解合理营养管理的潜力。在本研究中，在田间试验期间检查了一个异质生境和四个处理的同质生境，每个处理四个重复。干旱胁迫导致了显着减少的氮含量的母亲和第一分株，最大半径，地上和地下的质量，每小区的分株数，叶含水量和水势和增加的碳含量和C：N比在均匀和异质的地块相比，浇水和营养条件。电镜观察结果表明，干旱胁迫使肯塔基州早熟禾叶片横切面、第1、2、3分株叶的导管直径、周长和木质部面积缩小，而筛径和韧皮部面积增大。因此，可以得出结论，水分胁迫显着降低了肯塔基州早熟禾的所有重要性状，然而，适当的营养管理处理导致最佳的补偿性能在干旱缓解其逆境在一定程度上，并可能被认为是在制定良好的可行性和成本效益的做法，为环境条件下的相关研究。
Non-irrigated crops in temperate and irrigated crops in arid regions are exposed to an incessant series of drought stress and re-watering. Hence, quick and efficient recuperation from drought stress may be amongst the key determinants of plant drought adjustment. Efficient nitrogen (N) nutrition has the capability to assuage water stress in crops by sustaining metabolic activities even at reduced tissue water potential. This study was designed to understand the potential of proper nutrition management by studying the morphological and physiological attributes, and assimilation of nitrogen in Kentucky bluegrass under drought stress. In present study, one heterogeneous habitat and four treatments homogenous habitats each with four replications were examined during field trial. Drought stress resulted in a significant reduction in the nitrogen content of both mother and first ramets, maximum radius, above and below ground mass, number of ramets per plot, leaf water contents and water potential and increased the carbon content and the C:N ratio in both homogenous and heterogeneous plots compared to well-watered and nutritional conditions. Observation using electron microscopy showed that drought stress shrunk the vessel diameter, circumference and xylem area, but increased the sieve diameter, and phloem area in the leaf crosscutting structure of Kentucky bluegrass, first, second, and third ramet leaf. Thus, it can be concluded that water stress markedly reduced all the important traits of Kentucky bluegrass, however, proper nutritional management treatment resulted in the best compensatory performance under drought assuaging its adversity up to some extent and may be considered in formulating good feasible and cost-effective practices for the environmental circumstances related to those of this study.