不同穗型水稻品种穗部参数及其相互关系

研究了5个不同穗型的杂交稻品种主要穗部性状参数及其相互关系。分析了穗长、枝梗分布、枝梗颖花数及其结实率、穗部维管束数目和开花期单茎干物重对穗粒数的影响。初步确立大穗型品种所需参数指标。讨论了株型设计中大穗型的培育方向。结果表明:不同穗型品种的穗长与颖花数呈极显著正相关(P0.01),基部和颈部直径与穗粒数呈显著正相关(P0.05)。培育基部节间粗的品种,并以单位干物重的高颖花数作为选择指标,可以增强抗倒伏能力,也是培育适合当今种植需要的大穗型品种的选择之一。

Panicle Parameters and Their Relationships of Rice Varieties with Different Type of Panicle

The relationship of panicle parameters with rice varieties with different type of panicle was studied. The effects of the panicle length, branch distribution, number of spikelets, seed set percentage, neck vascular bundles and plant weight per stem on spikelet number per panicle were analyzed. Parameters index of large panicle type were established preliminarily, and the cultivatable foreground of plant type design was discussed. The result showed that:the panicle length of different panicle types was positively and significantly correlated with spikelet numbers(P＜0.01), the diameters at the base and neck were positively and significantly correlated with grain number per spike(P＜0.05), too. Breeding of thicker basal internode and more spikelet numbers was beneficial to increase lodging resistance and suite for planting system nowdays.