辽宁省不同熟期水稻品种株型特征比较研究

Comparative Study on Plant Type Characteristics of Different Maturity Stage Rice Cultivars in Liaoning Province

以参加2015年辽宁省水稻区域试验的早熟组、中熟组和中晚熟组品种(系)为材料,研究了不同熟期水稻品种的株型特征关系。结果表明,早熟品种主要是弯穗型、轻穗型,中熟品种多为直立穗型、重穗型品种,晚熟品种以半直立穗型、重穗型品种为主;不同熟期品种叶长差异不显著,叶宽表现为中晚熟品种>中熟品种>早熟品种,但叶基角正好相反;二次枝梗结实率表现为早熟品种>中晚熟品种>中熟品种,二次枝梗贡献率表现为中晚熟品种>中熟品种>早熟品种;穗型指数均以下部优势粒为主。

The plant type characteristics and their relationships of different maturity stage rice cultivars were studied in this paper, us- ing forty cultivars as materials which participated in the rice regional trial in Liaoning Province in 2015. The results indicated that the plant type of early maturity cultivars were mainly curve panicle type（CPT）and light panicle type（LPT）, the medium mature varieties were erect panicle type （EPT） and heavy panicle type（HPT）, the late maturity varieties were semi-erect panicle type and HPT. There existed no significant differences among different maturity type rice cuhivars for leaf length, leaf width showed late maturity varieties 〉 medium maturity varieties 〉 early maturity varieties, but the leaf base angle was opposite. The secondary branch grain rate showed early maturity varieties 〉 medium maturity varieties 〉 late maturity varieties. The contribution rate of secondary branch showed late ma- turity varieties 〉 medium maturity varieties〉 early maturity varieties. The panicle type index was mainly dominated by the superior grains on the low part.