玉米杂交种与亲本主要光合性状的比较

Comparison of Photosynthetic Characteristics of Parents and Hybrids of Corn ( Zea mays L.)

对５个自交系及其组配的４个杂交种光合性能的分析表明，杂交种较其亲本在光合面积上表现出三种关系类型，即居中、偏高亲、超高亲；而在光合时间上表现为负优势；在光合速率上表现为正优势，幅度在３．１％～２３．４％，超高亲２．４％～９．３％。光合速率杂种优势与叶绿素含量有关。杂交种的叶绿素ａ／ｂ和类胡萝卜素／叶绿素较亲本有降低的趋势。结合产量及有关性状分析表明。

The photosynthetic characteristics of 4 hybrids and their parents of corn were comparetively analysed in this paper.There were 3 kinds of types in leaf area of hybrids:middle,inclined to high parent and superhigh parent. The hybrid was negative hybrid vigor in photosynthetic time,but positive vigor in photosynthetic rate which ranged from 3.1% to 23.4%.The photosynthetic vigor in hybrid was related with concentration of chlorophyll.The ratios of chlorophyll a/b and carotene/chlorophyll in hybrids were lower than that in their parents. Hybrid vigor in grain yield primarily dependent upon the sink and source system.