留桩节位与母叶对再生稻生长发育的影响

EFFECT OF CUTTING NODE AND LEAVES RETAINED ON THE MOTHER STEM ON RICE RATOONIGN

本文探讨了头季稻收获时保留的母茎节数与母叶数对再生稻生长发育与产量形成的影响．结果表明：在同样保留例二节上休眠芽的情况下，保留母茎到叶或倒二叶和倒一节可以增加母茎的干物重和营养物质贮藏量，因而可以减少头季稻收获后再生芽的死亡率，促进再生芽的萌发，增加发南数。相应地也使再生稻育效德数有所增加．但发苗期延长．迟发苗和弱苗增多，加之母叶与倒一节的严重荫蔽作用，使再生稻株生长发育较差，结实率、稳实粒数和千粒重均降低．产量不高。在去除倒二节后的第三节再生芽较保留了第二节的发苗多、生长好、有效稳增加、结实率、德实粒数和千粒重提高，在去除了第三节后的第四节再生芽也表现同样趋势，表明再生芽的萌发生长也具有顶端优势现象。再生稻产量以去掉第一节保留第二节的最高。

The effect of cutting node and the leaves retained on the mother stem on the growth and grain yield of rice ratooning,ere studied. The results were showed as follows: Retaining the flag leaf or the second leaf and the first inter-node (from top to bottom) of the mother stem could increase the dry weight and food reserves of the stubble. as a result. it reduced the percentage of dead bud. increased the tiller number and effective panicles of ratooning rice by some extent. But it,ould shade the ratoon plant. retarded its growth, as a result the percentage of filled spikelets. filled spikelets per panicle and 1000-grain weight of ratoon plant decreased in this case. There were more effective panicles.more filled spikelets per panicle and higher percentage of filled spikelets on the ratoon plants origined from the third node after cutting the second node of the oother stem. The similar results,ere found on the ratoon plant origined from the fourth node after cutting the third node of the mother stem. It seemed that the apical dorminance,as broken in this case.