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1.各类型小麦光合速率的高低顺序为野生麦、春麦、冬麦和地方品种。小麦的光合速率随着它们的生长发育而提高,开花期达到最大值,以后下降,其光合速率曲线为单峰型。2.小麦叶片的光合速率上位叶比下位叶高,旗叶最高。61个栽培小麦的旗叶光合速率平均为28.44毫克 CO_2/分米~2·小时,变幅为19.97—32.66毫克。品种间光合速率差异显著。21个栽培小麦光呼吸速率平均为8.11毫克 CO_2/分米~2·小时,变幅为5.0—14.0毫克,亦存在明显的差异。3.小麦旗叶的光补偿点为700 Lux 左右。此时光强增加,光合速率提高,到50,000 Lux 达饱和,饱和后若再增加光强则光合速率下降,光呼吸速率则不同,在光合速率的光饱和点以后仍继续提高,没有看到下降的趋势。4.在不同年分和栽培条件下,小麦品种间的光合速率有变化,但顺序基本相同,保持相对稳定值,差异不显著。
1. The photosynthetic rate of all types of wheat in the order of the wild wheat, spring wheat, winter wheat and local varieties. The photosynthetic rate of wheat increased with their growth and development, the flowering stage reached the maximum, and then decreased. The photosynthetic rate curve of the wheat was unimodal. The photosynthetic rate of wheat leaves in the upper leaves than the lower leaves, flag leaves the highest. The average photosynthetic rate of flag leaf in 61 cultivated wheat was 28.44 mg CO 2 / dm 2 · h, and the amplitude was 19.97-32.66 mg. Differences in photosynthetic rate among cultivars were significant. The average photosynthetic rate of 21 cultivated wheat cultivars was 8.11 mg CO 2 / dm 2 · h and the amplitude was 5.0-14.0 mg. There were also significant differences. 3. Wheat flag leaf light compensation point is about 700 Lux. At this time, the light intensity increased, photosynthetic rate increased to 50,000 Lux up to saturation, and then if you increase the light intensity after saturation, photosynthetic rate decreased, the photo respiration rate is different from the photosynthetic rate of light saturation point after continued to increase, did not see the decline trend. In different years and cultivation conditions, the photosynthetic rate of wheat varieties have changed, but the order is basically the same, to maintain a relatively stable value, the difference was not significant.