重穗型杂交稻Ⅱ优6078生育后期生理特性研究

测定了籼粳稻亚种间重穗型组合Ⅱ优６０７８和对照汕优６３生育后期剑叶中叶绿素含量与净光合速率（Ｐｎ）、超氧化物歧化酶（ＳＯＤ）与过氧化物酶（ＰＯＤ）活性、可溶性蛋白质含量与硝酸还原酶（ＮＲ）活性、内源激素（ＺＴ、ＧＡ３、ＩＺＺ）含量。结果表明，Ⅱ优６０７８生育后期叶绿素含量高，光合能力强，且叶片衰老缓慢，内源激素含量高，是Ⅱ优６０７８获得高产的重要原因。

Studies on the Physiological Characteristics of Heavypanicle Hybrid Rice You 6078 in Late Stage

The chlorophyll content, net photosynthetic rate (Pn), superoxide dismutase (SOD) activity, peroxidase (POD) activity, soluble protein content, nitrate reductase (NR) activity and contents of endogenous plant hormones (ZT, GA3, IZZ) were tested in the flag leaves of You 6078, a heavypanicle type intersubspecific hybrid rice, and the check Shanyou 63 in full heading and grain filling stages. The results showed that You 6078 had higher contents of chlorophyll and endogenous plant hormones, a higher photosynthetic intensity and NR activity, and a slower decreasing rate in SOD and POD activity and soluble protein content in the late stage, which is the important reason for You 6078 yielding higher than Shanyou 63.