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在春季小麦返青后的各生育期中，供试化杀型（ＣＨＡ）杂种麦优４号和Ｔ型三系杂种麦优１号与亲本和对照相比，在群体光合速率（ＣＡＰ）、群体叶源量（ＣＬＳＣ）和叶面积指数（ＬＡＩ）上都表现明显杂种优势，这些优势随生育进程呈逐渐增强趋势。杂种小麦在返青后各生育期的群体干物重（ＰＤＷ）均优于亲本。ＣＬＳＣ与ＰＤＷ呈极显著正相关表明，ＣＬＳＣ可作为反映群体物质生产力大小的可靠指标。供试杂种在籽粒产量上的优势亦较明显，其平均优势（ＡＨ）大于超标优势（ＳＨ）。麦优４号、麦优１号的穗数、粒数、粒重三产量构成因素的ＡＨ均为正值，ＳＨ在麦优４号中表现为单位面积穗数和千粒重为正值，穗粒数为负值；在麦优１号中则单位面积穗数和穗粒数为正值，千粒重为负值。麦优４号的籽粒产量优于麦优１号。杂种小麦在ＣＡＰ、ＣＬＳＣ上的明显优势是其获得ＰＤＷ优势及籽粒产量优势的重要生理基础。本文还就杂种光合优势和光合作用与产量的关系进行了讨论。
Compared with the parental and the control, the test-killing CHA hybrid Maoyou 4 and the T-type three-line hybrid Maoyu 1 showed no significant difference in the photosynthetic rate (CAP) Both CLSC and LAI showed obvious heterosis, and these advantages tended to increase along with the growth process. The population dry matter weight (PDW) of hybrid wheat was higher than that of its parent at each growth stage after returning to green. The extremely significant positive correlation between CLSC and PDW indicates that CLSC can be used as a reliable indicator of population productivity. The heterosis of tested hybrids was also more obvious in the grain yield, with the average superiority (AH) greater than the superiority (SH). AH of wheat yield and grain weight and grain weight of wheat cultivars were all positive, and the number of spike and grain weight per unit area of SH was the highest in wheat cultivar No.4. The number is negative. In Maoyou 1, the number of spikes per panicle and the number of grains per spike are positive, and the value of 1000-grain is negative. The grain yield of Maoyou 4 was better than that of Maoyu 1. The obvious advantage of hybrid wheat on CAP and CLSC is its important physiological basis to obtain the advantages of PDW and grain yield. The paper also discussed the relationship between the heterosis of photosynthesis and photosynthesis and yield.