Comparative Analysis of Photosynthetic Charactics Asociated with the Three Ear Leaves at Filling Stage between Hybrid and Its Parants
Two maize hybrid combinations of Tang 65/Chang 7-2 and PH6WC/PH4CV were studied,and the length,width,area,chlorophyll content,main photosynthetic parameters and water use efficiency of the leaves were compared and analyzed.The results showed that the leaf length,width,leaf area and dry quality of the two hybrids were significantly or extremely significantly superior to their parents in leaf length,width,leaf area and dry quality.In terms of leaf length and width,the width dominance of the two hybrids was more significant than that of their parents,among which Xianyu 335 was the most dominant parent.The comparison of leaf dry quality and leaf heterosis showed that both of them were not identical,and some leaves had a larger difference in heterosis in two characters.Only the contents of Chla and Chlb in the ear leaf and the lower leaf of Xianyu 335 had significant overparent dominance,but the chlorophyll contents of the other two leaves had no super parental dominance.The results of Chla/Chlb ratio analysis showed that the Chla/Chlb ratio of hybrids had little change compared with their parents,among which,the Chla/Chlb ratio of Xianyu 335 was larger in panicle leaves.At about 3.0,the other two leaves were about 2.0.Tang 65/Chang 7-2 had a maximum value of 3.0 in the upper ear leaf,and the other two leaves were about 2.0.The 3 parameters ofPn,Tr and Gs on the superior leaves of Xianyn 335 and the Pn expression of the ear leaves of Tang 65/Chang 7-2 were over dominant expression patterns,while the Ci of the superior leaves of Xianyu 335 was negative super dominant,while the others were additive or dominant expression patterns.Further analysis of the water use efficiency of the three ear leaves showed that,the WUE of ear leaf and inferior leaf of Xianyu 335 was significantly higher than that of two parents,the OPH was 48.04％ and 38.97％,respectively,while the WUE of the superior leaf was-18.40％.Tang 65/Chang 7-2 had the OPH only in the inferior leaf WUE,which reached 52.12％,the changes of ear leaf and superior leaf were lower and higher affinity respectively.These results have accumulated valuable materials and information for the creation of new maize germplasm and the breeding of new varieties with strong heterosis.
NETL
NSTL
万方数据
维普
