不同穗型小麦品种群体光合特性及产量性状的研究

Study on Canopy Apparent Photosynthesis Characteristics and Grain Yield Traits of Two Winter Wheat Cultivaters with Different Spike Type

多穗型品种豫麦 4 9和大穗型品种周麦 13的群体光合 (CAP)速率在整个生育期内的变化趋势一致 ,均为单峰曲线 ,峰值出现在开花期 ;但生育前期豫麦 4 9的 CAP高于周麦 13,而开花后周麦 13有明显优势。两品种的群体叶源量 (CLSC)具有与 CAP相同的趋势。开花期和灌浆中期的 CAP日变化都呈单峰曲线 ,峰值出现在上午 10 h左右。不同穗型品种不同密度处理之间的群体光合特性和产量性状存在着差异。在此研究基础上 。

There was the same trend in the change of canopy apparent photosynthesis (CAP) rate in both small spike type cultivar(Yumai 49)and large spike type cultivar(Zhoumai 13). During the entire growth period the CAP generally appeared as a single peaked curve and the peak value reached at the anthesis stage. Yumai 49 had a higher CAP before booting stage, but Zhoumai 13 showed obvious dominance in CAP after flowering stage. The change of CAP in canopy leaf source capacity(CLSC) of the two cultivars was similar to that of CAP. The diurnal changes of CAP at flowering stage and mid filling stage were single peaked ones and the peak value reached at 10am. The differences existed in the CAP and grain yield characteristics among different planting densities of the two cultivars. The main cultivating way for the two cultivars was presented for the super high yield object.