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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 ,提出了两种穗型品种实现超高产的主攻方向及相应技术措施
The trend of photosynthetic rate (CAP) of multi-spike cultivar Yumai 49 and large-spike cultivar Zhoumai 13 was the same during the whole growth period, both of them were single peak curve, and the peak appeared in flowering stage. However, The CAP of 49 was higher than that of Zhoumai 13, while Zhoumai 13 had obvious advantages after flowering. The population leaf volume (CLSC) of both cultivars has the same tendency as CAP. The diurnal variations of CAP in the flowering and mid filling stages all showed a single peak curve with the peak appearing at about 10 h in the morning. There were differences in photosynthetic characteristics and yield traits of different spikelet varieties under different density treatments. On the basis of this research, the author proposes the main directions and corresponding technical measures for achieving two types of panicle varieties