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田间渗漏计中,四种叶龄的玉米植株(分别为4,6,8和11片叶)同期经受水渍5天。各种株龄受涝后籽粒产量都明显下降,影响随株龄增大逐次减轻,以4叶期产量下降幅度最大。淹水导致叶片生理状况恶化,也以4叶期受影响严重。淹水刺激了次生根的出生,根组织内有较大的孔隙度,次生根数占总根数的比值随株龄而增大。这一比值与籽粒产量下降率之间呈极显著的负相关。由此推知,次生根出生潜力的不同可能是各种叶龄植株对淹水适应性差异的重要原因之一,从而也可解释4叶期为夏玉米对涝渍反应的敏感期。
In the field leakage meter, four leaf age corn plants (4, 6, 8 and 11 leaves, respectively) experienced water stains over the same period for 5 days. The grain yield of all ages after waterlogging decreased obviously, and the effect of allelopathic alleviating gradually decreased with the increase of plant age, and the yield of 4-leaf decreased the most. Flooding led to deteriorating leaf physiological status, but also to 4-leaf stage affected seriously. Flooding stimulated the birth of secondary roots, with greater porosity in the root tissues, and the ratio of secondary roots to total roots increased with age. This ratio has a very significant negative correlation with the rate of grain yield decline. It can be deduced that the difference in the potential for secondary root growth may be one of the important reasons for the differences in adaptability to flooding among various leaf age plants and thus may also explain the sensitive period of 4-leaf stage to the waterlogging response of summer maize.