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Matter production in wheat plant 3. changes with growth in photosynthetic capacity and respiratory capacity of wheat strand



Matter production in wheat plant 3. changes with growth in photosynthetic capacity and respiratory capacity of wheat strand



Japanese Journal of Crop Science 47(1): 63-68



Using the data on diurnal changes of CO2 exchange and environmental factors obtained at each stage of growth in 2 experiments of 1969-1970 and 1971-1972, the authors investigated the developmental changes in photosynthetic capacity and respiratory capacity of wheat stand and their related factors. In both experiments, photosynthetic capacity of wheat stand (rate of net CO2 uptake per unit land area at the radiation level of 0.6 ly min-1 and at comparatively favorable temperatures) gradually increased in winter and then rapidly attained the maximum value (ca. 5 gCO2 m-2 h-1) at flowering, and thereafter decreased rapidly. The time trend in photosynthetic capacity was closely related with that of LAI (leaf area index) throughout the whole growth period in the 2 experiments. From the investigation of LAI-photosynthetic capacity curve, which was drawn from the data obtained at various times of growth, it was shown that photosynthetic capacity increased with increasing LAI in its range up to 4-5. Above this range of LAI, photosynthetic capacity did not seem to increase with increasing LAI. According to comparisons between photosynthetic capacity of the stand before and after heading and between apparent photosynthetic rate of the stand before and after ear removal, wheat ears contributed to the photosynthetic capacity of stand by 10-20%. The respiratory capacity of stand (rate of CO2 release per unit land area at 10.degree. C temperature) increased with growth and attained the maximum value (ca. 0.4 gCO2 m-2 h-1, 1969-1970; ca. 0.3 gCO2 m-2 h-1, 1971-1972) at flowering or a little earlier, and thereafter decreased rapidly. The respiratory activity of plant (rate of CO2 release per unit plant dry weight under 10.degree. C temperature) remained relatively low and constant during winter. The activity began to increase at the middle of Feb. and attained the maximum value at the beginning or middle of March when the stand just started to grow vigorously, decreasing thereafter with the progress of growth. In the 1st half of the growth period, the change with growth in respiratory capacity of stand was mainly attributed to that in total plant dry weight per unit land area, and in the latter half, to that in respiratory activity of plant.

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Accession: 005858645

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