The maintenance of growth and turgor in pearl millet (Pennisetum glaucum [L.] Leeke) cultivars with different root structures and osmo-regulation under drought stress
The maintenance of growth and turgor in pearl millet (Pennisetum glaucum [L.] Leeke) cultivars with different root structures and osmo-regulation under drought stress
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DOI：
10.1016/j.plantsci.2004.06.021
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发表时间：
2005-01-01
期刊：
影响因子：
5.2
通讯作者：
Fujimura, T
中科院分区：
文献类型：
--
作者：
Kusaka, M;Lalusin, AG;Fujimura, T
珍珠谷子(Pennisetum glucum[L.](Leeke)可以适应非常干燥的条件，然而，对干旱失水和脱水耐性的控制仍然不完全清楚。研究了水分胁迫对植物根系形态、渗透关系和气孔导度的影响。在温室苗期不浇水3周，施加水分胁迫。进行了灌水处理和两种胁迫处理的试管培养试验。一种胁迫处理是通过施加水分亏缺，特别是在土壤的浅层(半干旱)，另一种是通过在土壤中施加广泛的水分亏缺(干旱)。在两种胁迫处理中，总根长(TRL)的遗传多样性与保持水分后4-21天内的地上部分的相对生长率(RGR)显著相关。另一方面，渗透调节与RGR和叶片膨胀势(LTP)也有很强的相关性，但在干旱条件下，TRL和OA对RGR变异的影响相对较小。这些结果表明，干旱条件下水稻苗期的水分亏缺程度决定了植株的伸长和伸长，这是影响苗期水分维持和植株生长的最重要的因素。(C)2004爱思唯尔爱尔兰有限公司。保留所有权利。
Pearl millet (Pennisetum glaucum [L.] Leeke) is known to adapt to very dry conditions, however, the control of water loss and dehydration tolerance to drought is still not completely understood. Effects of water stress on root morphologies, osmotic relations, and stomatal conductance contributing to plant growth or turgor maintenance was investigated. Water stress was imposed by withholding water for 3 weeks at the seedling stage in a greenhouse. Irrigated treatments and two stress treatments were conducted in a tube culture experiment. One stress treatment was done by imposing water deficit, particularly in shallow areas of the soil (semi-drought), and the other was done by imposing widespread water deficit in the soil (drought).The genetic diversities in the total root length (TRL) were significantly related to the relative growth ratio of the shoot (RGR) within 4-21 days after withholding water in both stress treatments. On the other hand, osmotic adjustment was also strongly correlated with RGR and leaf turgor potential (LTP) in both stress treatments, but the effects of TRL and OA in terms of contributing to the variance in RGR was comparatively low under drought conditions. These results demonstrated that OA and TRL were dependent on the degree of water deficit, and these traits were the most important factors regarding turgor maintenance and plant growth under drought conditions during the seedling stage. (C) 2004 Elsevier Ireland Ltd. All rights reserved.