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两个不同穗型的冬小麦品种 :多穗型品种济南 16和大穗型品种鲁麦 2 2 ,在冠层结构、光合特性、干物质积累运转等方面存在较大的差异 ,济南 16上部节间相对较长 ,株高构成指数 I值较大。鲁麦 2 2上三叶面积、长宽比、夹角较小。济南 16冠层光截获大于鲁麦 2 2 ,而鲁麦 2 2下层相对光强较大。生育期内小麦群体光合速率的变化呈单峰型曲线 ,济南 16始终高于鲁麦 2 2 ,而鲁麦 2 2平均单茎光合速率占一定优势。群体和单茎呼吸速率的变化趋势及品种间差异同光合相似 ,但峰值出现时间晚于光合。产量形成主要靠花后光合产物 ,而济南 16花前产物在中后期向穗部运转能力较强。促进和延长灌浆期间的群体光合速率有利于产量进一步提高。对两种穗型小麦品种进一步改良的有关问题进行了讨论
Two winter wheat cultivars with different panicle types: multi-panicle type Jinan 16 and large panicle type Lumai 2 2 had significant differences in canopy structure, photosynthetic characteristics and dry matter accumulation and transportation. The upper section of Jinan 16 Relatively long, plant height index I value larger. Lumai 2 2 on the three leaf area, aspect ratio, angle smaller. Jinan 16 canopy light intercepted more than Lumai 2 2, while Lumai 2 2 relatively large relative light intensity. The photosynthetic rate of wheat population during the growth period showed a single peak curve, Jinan 16 was always higher than Lumai 2 2, and Lumai 2 2 average single stem photosynthetic rate accounted for certain advantages. The trend of population respiration and single stem respiration rate were similar to photosynthesis, but the peak appeared later than photosynthesis. The yield mainly depends on the photosynthetic products after anthesis, while the flower products of Jinan 16 are more capable of running to the ears in the mid and late stages. Promote and extend the population photosynthesis rate during grain filling is conducive to further improve the yield. The issues related to the further improvement of the two types of spike wheat varieties were discussed