剪叶对茭白肉质茎膨大的影响

Effect of Defoliation on Gall Swelling of Zizania caduciflora

以 1个单季茭和 1个双季茭茭白品种为试材 ,在肉质茎开始膨大时进行不同程度的剪叶处理 ,结果表明 :各处理在开始膨大后最初几天内干、鲜质量差异不明显 ;剪去叶片对肉质茎膨大影响不大 ,但切除叶鞘后 ,肉质茎膨大初期以后的干、鲜质量显著下降 ;整株剪叶比单茎剪叶处理对肉质茎膨大的影响大 ,剪去叶片与切除叶鞘、叶片表现相似。由此认为 ,茭白肉质茎膨大所需养分主要依靠短缩茎和叶鞘在肉质茎膨大前的积累 ,肉质茎膨大过程中植株茎蘖间存在养分交流 ,品种间在膨大速率上有一定差异。

Comparative studies were conducted on the swollen culms at different defoliation treatments when zizania gall began to swelling with two water bamboo varieties. The results showed that dry weight and fresh weight had no notably difference at the early period of swollen gall development, and there were no markable influences on gall swelling after removing the leave.But afterwards the dry and fresh weight of swollen gall descended observably when all leave and sheath were cut. Defoliation in all plant engendered a more evident influence than that in single tiller. Conclusion was that the nutrients that swelling gall needed depended a great upon the nutrient accumulation in culm and sheath previously. Nutrients exchange occurred between tillers when the gall swelling. There were difference in varieties at swelling rate.