Effect of Pre- and Post-heading Water Deficit on Growth and Grain Yield of Four Millets
Effect of Pre- and Post-heading Water Deficit on Growth and Grain Yield of Four Millets
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DOI：
10.1626/pps.15.323
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发表时间：
2012-10-01
影响因子：
2.5
通讯作者：
Murata, Kouhei
中科院分区：
文献类型：
--
作者：
Matsuura, Asana;Tsuji, Wataru;Murata, Kouhei
黍、苏门答腊黍、灰狗尾草和粟粟的种子;在温室内用聚氯乙烯（PVC）管填充桑迪，研究了抽穗前后水分亏缺对italica生长和产量的影响。播种后25天开始水分胁迫处理。S. italica和S.在水分胁迫下，青冈藻的光合速率分别下降了80%和70%，粟茅和苏门答腊藻的光合速率分别下降了36%和20%。穗粒数减少、穗数减少和总干重减轻是造成产量下降的主要原因。抽穗前水分胁迫使小麦籽粒产量下降。italica和S.青冈在抽穗前和抽穗后的生长速率均高于白僵菌和苏门答腊白僵菌。轻度水分胁迫降低了所有谷子的叶水势。叶片的渗透调节不能解释种间耐旱性的差异。水分胁迫促进了S. italica，S.在抽穗期较深土层中，青冈和苏门答腊青冈的生长量最大。在收获时，它也增加了根的生长在较深的土壤层在S。italica和S. glauca。谷子产量与根干重呈极显著正相关。意大利语。耐旱谷子无论在营养生长期还是生殖生长期都比两个敏感谷子表现出更强的耐旱性。
Seeds of Panicum miliaceum, P sumatrense, Setaria glauca and S. italica were raised in polyvinylchloride (PVC) tubes filled with sandy soil in a greenhouse to determine the effect of pre- and post-heading water deficit on growth and grain yield. Water stress treatment was initiated 25 days after sowing. The grain yield of S. italica and S. glauca decreased 80 and 70%, respectively, under water stress; and that of P miliaceum and P sumatrense decreased 36 and 20%, respectively. The reductions were ascribed to smaller number of grains per panicle, smaller number of panicles and lighter total dry weight. The grain yield decreased when water stress was imposed before heading in S. italica and S. glauca, but both before and after heading in P. miliaceum and P sumatrense. Mild water stress decreased the leaf water potential of all millets. Osmotic adjustment of the leaf could not explain the interspecific difference in drought tolerance. Water stress increased the root growth of S. italica, S. glauca and P sumatrense at deeper soil layers at heading. At harvest, it also increased root growth at deeper soil layers in S. italica and S. glauca. There was a significant correlation between grain yield and root dry weight among the millets except S. italica. The drought tolerant millet showed greater drought tolerance to water deficit not only at the vegetative stages but also at the reproductive stages than two susceptible millets.