不同种植方式对水稻颖花穗部分布的影响

为研究在不同种植方式下水稻穗颖花量的变化特征,设置4种不同田间种植方式,研究水稻稻穗颖花特征。试验发现:(1)稻穗颖花由穗基部向穗顶方向在稻穗呈抛物线型分布,穗中部颖花量最大;(2)随着单株水稻稻田生态空间增加,稻穗颖花总量及穗上、中、下部颖花量分别增加;稻穗一次枝梗数及其颖花量无明显增加;稻穗二次枝梗数及其颖花量和稻穗中、下部二次枝梗数增加及稻穗上、中、下部二次枝梗颖花量显著增加,其中杂交稻表现穗中、下部二次枝梗数增加,常规稻仅为穗中部二次枝梗数增加;(3)单株水稻颖花量与其籽粒重显著正相关(R~2=0.804)。研究结果表明不同种植方式对水稻颖花穗部分布影响主要表现在二次枝梗数总数及分布在穗中、下部位的二次枝梗数,和二次枝梗的颖花量及其在穗的下、中、上部位的分布数量。

The Effect of Different Rice Planting Patterns on Spikelet of Rice Panicle

Four different rice planting patters were carried out in paddy field of Rice Experiment Base in Danzhou City of Hainan to reveal the changing characteristics of rice spikelets in different planting patters. The results showed that: (1)The quantity of rice spikelets was a parabola on rice panicle from rice panicle basal part to rice panicle top part. (2)With the field ecological space of individual rice plants increasing, the total spikelets, top spikelets, middle spikelets and basal part spikelets of rice panicle were increased, and the number of primary branches and their spikelets were not increased significantly, and the number of secondary branches and their spikelets were increased. The number of secondary branches of hybrid rice was increased by middle and basal part secondary branches, and the number of secondary branches of inbred rice was increased by middle part secondary branches only. (3)The quantity of rice spikelets per palnt was significantly positive correlated with grain weight (R2=0.804). Based on the study results, the distribution of the spikelets of rice panicle in different planting patterns mainly showed that the total number of secondary branches and their distribution in the middle and basal part of rice panicle, and the number of spikelets of secondary branches and their distribution in different parts of the rice panicle.