J Integr Plant Biol. ›› 1981, Vol. 23 ›› Issue (2): -.

• Research Articles •    

Studies on the Chemical Properties and Photorespiration in Wheat

Lai Shi-deng, Liu Zuo-chang, Yu Yan-po and An Qing-kun   

Abstract: The rate of photosynthesis in various types of wheat was ordered in descending scale as follows: wild type, spring, winter and local varieties. The increase amount in the rate of photosynthesis depended on the course of growth and develoment of the wheat plant itself. It reached maximum at flowering stage, there after, it decreased gradually. The curve of the rate of photosynthesis was unipeak type. 2. The rate of photosynthesis in wheat leaves was higher in upper leaves than the lower ones. It was raised to maximum in flag leaves. The rate of photosynthesis in flag leaves of 61 cultivars was 28.44 mg CO2/dm2 hr. in average, the range of variation was 19.97 to 32.66 mg CO2/dm2 hr. Difference of the rate of photosynthesis among varieties was significant. In 21 cultivars the rate of photosythesis was in average 8.11 mg CO2/dm2. hr. and the range of variation was in 5.0 to 14.0 mg CO2/dm2. hr. and significant difference occurred. 3. The light compensation point of flag leaves of wheat plant was about 700 Lux. At this time, with increasing light intensity the rate of photosynthesis raised too. The satura- tion point of light was about 50,000 Lux. The light intensity was further increased the rate of photosynthesis decreased. On the contrary it was found that the rate of photorespiration did not decreace. 4. In different years and under the different enviromental conditions, the rate of photosynthesis varied among different cultivars of wheat, but the order of that was basically the same. The differece was not significant.

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