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Influence of Photoperiod on the Ear Differentiation of Winter Wheat

QIAN Zhao-guo et al(Taian Municipal Academy of Agricultural Sciences,Tainan,Shandong 271000)  
[Objective] The study aimed to know about the influence of photoperiod on the ear differentiation of wheat.[Method] In the pot test,the wheat varieties such as Taishan 9818,Taishan 21,4133 and J30 were treated by photoperiods with different sunshine time so as to study the influence of photoperiod on the ear differentiation of winter wheat.[Result] J30 was the variety sensitive to photoperiod and Tanshan 9818,4133 and Taishan 21 were the varieties insensitive to photoperiod.The variety sensitive to photoperiod got inhibition on growth in short sunshine,had least days of differentiation stage from glume to flowerlet,got strongest inhibition in the stages while the double ridge stage appeared and was passed and the pistil and stamen appeared.The inhibition degree of short sunshine for 8 h on the varieties insensitive to photoperiod was obvious less than that on the variety sensitive to photoperiod.The inhibition was strongest in initial double ridge stage,differentiation stage of pistil and stamen primordia and pistil and stamen-heading stage,secondary in double ridge-glume stage.The inhibition degree of short sunshine on large-spike variety Tanshan 9818 was obviously bigger than that on multi-spike varieties Tanshan 21 and 4133.[Conclusion] A certain stage during ear differentiation couldn't be as the sign of wheat passing sunshine stage.
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