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本研究在开花时去除一半穗粒数使库强发生变化,由此评价小麦库源关系的本质.其主要假设为水分胁迫可改变库源关系,弱库可改进源的抗旱性.研究包括两个试验,试验一评价了去粒对大田小麦(两个品种)的影响;试验二在温室中评价了植株开花后受水分胁迫〔将作物根系浸入聚乙二醇(6000)溶液中处理〕时去粒的效应,并以无胁迫处理为对照.两个试验去粒后所提供的数据有:叶气体交换、叶水势、叶和穗(温室中)的渗透调节,作为茎贮存物移动指数的茎损失百分率,最终根重(温室中)和穗重构成因素.去粒导致旗叶气孔传导力、碳交换率和蒸腾的降低,但却增加了旗叶水势;在水分胁迫下,这些影响有所增强.去粒并不影响旗叶的透渗调节,但改善了颖壳和芒的调节.去粒,尤以在干旱胁迫下,降低了茎重损失百分率,增加最终根重.弱库,由于能保持较高的叶水势,有较大的根系.较好的穗部渗透调节,以及可能延长旗叶的寿命,故被认为可以改进植株的抗旱性.这种抗旱性的改进是以降低旗叶碳交换率和减少茎(和根?)贮存物的移动量为代价的.
In this study, half the grain number per spike was removed to change the intensity of the plant, which was used to evaluate the nature of the relationship between source and sink of wheat.Its main assumption is that water stress can change the relationship between source and sink, and weak source can improve the source drought resistance.Studies include two In experiment two, the effect of degranulation on field wheat (two cultivars) was evaluated. In experiment two, the effect of water stress on the flowering of plants was observed in the second experiment (immersing crop roots in polyethylene glycol (6000) solution) The effect of degranulation was compared with that of the no-stress treatment.The data provided by the two experiments after degranulation were: leaf gas exchange, leaf water potential, osmotic adjustment of leaf and spike (in greenhouse) as index of stem storage mobility Stem weight loss, ultimate root weight (in the greenhouse) and panicle weight formation.Degradation led to reduced stomatal conductance, carbon exchange rate and transpiration of flag leaves, but increased flag leaf water potential. Under water stress, these effects were The grain weight did not affect the osmotic adjustment of flag leaves, but the regulation of glume shell and mantle was improved.Drying, especially under drought stress, reduced the percentage of stem weight loss and increased the final root weight.Weak pool, As to maintain a high leaf water potential, there is greater The better osmotic regulation of the ear and the possible extension of the life span of the flag leaf are considered to improve the drought resistance of the plant.The improvement of drought resistance is based on the reduction of the carbon exchange rate of the flag leaf and the reduction of the stem (root) The amount of storage moved at the expense of.