乐恢188与不同不育系配组的杂交稻茎秆物理性状与抗倒伏力的相关性

为抗倒伏杂交稻育种提供参考,以乐恢188与7个不育系配组的系列杂交水稻品种为材料,对比分析不同不育系配组的杂交稻植株的抗倒伏能力与基部各节间长度、茎秆粗度和茎壁厚度等性状的相关性。结果表明:基部各节间长度与倒伏指数呈正相关,与抗折力呈负相关;茎秆粗度、茎壁厚度、节间基部至穗顶长度与倒伏指数呈显著负相关,与抗折力呈显著正相关。金优188茎秆粗度与茎壁厚度小于其他品种,倒伏指数最大,最易发生倒伏;冈优188、福伊优188和蓉18优188茎秆粗度与茎壁厚度较大,倒伏指数小,不易发生倒伏。

Correlation between Stem Physical Characteristics and Lodging Resistance Capability in Hybrid Rice Varieties from Combinations between Lehui 188 × Different Sterile Lines

The correlations between lodging resistance and different internodes' length,stem diameter,stem wall thickness,length from basal to spike top in hybrid rice varieties from Lehui 188 × 7 sterile lines to provide a reference for breeding of hybrid rice varieties with a lodging resistance.Results:The length of different basal internode is positively related to lodging index and negatively related to breaking resistant strength.The stem diameter,stem wall thickness and length from basal to spike top are negatively related to lodging index significantly and positively related to breaking resistant strength significantly.The lodging phenomenon occurs in Jinyou 188 with the maximum lodging index easily because its stem diameter and stem wall thickness are less than other tested varieties but the lodging phenomenon does not occur in Gangyou 188,Fuyiyou 188 and Rong18 You 188 with the minimum lodging index easily because of their bigger stem diameter and stem wall thickness.