籼粳亚种间组合秆高的初步研究

对54个籼粳交组合及其亲本的分析表明,F1代秆高优势明显,表现为地上部伸长节间数增多和各节间伸长,特别是第二、三节间伸长,F1秆高与高、中亲值及其抽穗日数均呈极显著正相关,与单株粒数不存在显著的线性相关,F1具6个伸长节间,以第四、第六节间长度对秆高的直接影响大,第六节长度与每穗总粒数呈极显著正相关。但第1、2、3、4节间长度与每穗总粒数则是极显著或显著负相关。

Preliminary Studies on The Culm Height of Indica-Japonica Hybrids

Fifty four indica-japonica hybrids and corresponding parents were evaluated. The results were as follow.: The culm Leight of Fl hybrids exhibited high degree of keterosis due to more and longer internodes. among which the second and third internods were much longer.The culm height of Fl hybrids was positively correlated with the high and mean parental values as well as the days from sowing to helding of F1 hybrids at significant level. No linear relation was observed between the culm height and total grains per plant of Fl hybrids.The length of the forth and f sixth internodes had greater direct contribution to the culm height of F1 hybrids than that of other 4 internodes. Grains pit panicle showed significantly positive correlation with the length of the sixth internode but very significantly or significantly. negative correlation with the length of the first. second, third and forth internodes.