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Photosynthetic Characters of F_1 Hybrids in Winter Wheat and Their Parents

The photosynthetic characteristics of 10 F 1 hybrids in winter wheat ( Triticum aestivum L.) and their parents were studied. The result showed that overall photochemical quantum yield of PSⅡ (Yield) and the coefficient of photochemical fluorescence quenching ( q P) of only each 4 F 1 hybrids winter wheat surpassed their parents in 10 cross combinations, but the photosynthetic functions, such as Yield, q P, PSⅡ activity (F v/F o), the efficiency of primary conversion of light energy of PSⅡ(F v/F m) and the coefficient of non photochemical fluorescence quenching ( q N) of F 1 hybrids in most cross combinations were similar with their female parents. The experimental results of reciprocal cross F 1 hybrids further proved this interrelationship. It is obvious that the excellence or poorness of most photosynthetic functions depends on matrilineal inheritance. According to the experimental results, we consider that the variety possessing excellent photosynthetic functions should be chosen as female parent when cross combinations are made in winter wheat crossbreeding. It might create the favorable conditions for further sifting stable cultivars of winter wheat possessing excellent photosynthesis functions. It is one of the ways that accelerates the process of crossbreeding in wheat.