小麦主茎总叶数的变异

小麦主茎总叶数是重要的植株性状。它也具有变异性。春型品种的主茎叶数少,冬型品种的主茎叶数多,过渡型品种居中。在不同播期中,强春性小麦的主茎叶数相近,一般春性品种变化不大。随着播期的推迟,过渡型和冬型品种的主茎总叶数逐渐发生变化,冬型品种的变化幅度大。冬播期中,在翌春出苗的情况下,所有品种的主茎总叶数都较少,

Variation of Total Leaf Numbers on Main Stalks in Wheat

The variation patterns of total leaf numbers on main stalk were observed with 31 varieties of wheat from 1982 to 1985 in Beijing.The leaf number is an important character ofwheat and it also shows the variability.The leaf numbers on main stalks were less inspringness varieties than that in winterness varieties,while the transition type got a middlevalue.At different sowing dates,the strong springness varieties got similar number ofleaves.And no obvious differences was found in the springness varieties.As the sowingdates delayed,the leaf numbers on main stalks showed differences gradually betweentransitional and winterness types.And a wide range of variation was found in winternessvarieties.Under the condition of winter sowing and seedling emerging at the next year,theleaf numbers on main stalks for all varieties were less than that in the other conditions andthe difference among varieties were quite small.This phenomenon could be related to thecharacters of various reactions to vernalization and photoperiod in the different stages ofplant growth and development.