Photosynthetica 1998, 35(4):573-578 | DOI: 10.1023/A:1006935125111

Photosynthetic and Transpiration Rates of Soybean as Affected by Different Irradiances During Growth

Y. Koesmaryono1, H. Sugimoto1, D. Ito1, T. Haseba1, T. Sato1
1 College of Agriculture, Ehime University, Matsuyama, Japan

The diurnal variation of net photosynthetic (PN) and transpiration (E) rates in soybean [Glycine max (L.) Merr. cv. Fukuyutaka] plants grown under 100, 50, or 25 % of full sun irradiance (I100, I50, I25 plants) were compared. In the morning, activities of the plants were measured at irradiances under which they grew. However, during the afternoon, all the plants were tested under full irradiance. The lower the growth irradiance, the lower PN, E, and mesophyll conductance values were found. Stomatal conductance was considerably lower in I25 plants only. Both the increase in specific leaf area (SLA) and the decrease in nitrogen content per leaf area unit contributed to the PN reduction of soybean plants grown under low irradiances. Though E of the plants grown under different irradiances differed less markedly than PN, the water use efficiency declined from I100 to I25.

Additional key words: Glycine max; growth; leaf nitrogen content; mesophyll conductance; specific leaf area; stomatal conductance

Prepublished online: December 1, 1998; Published: January 1, 1998  Show citation

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Koesmaryono, Y., Sugimoto, H., Ito, D., Haseba, T., & Sato, T. (1998). Photosynthetic and Transpiration Rates of Soybean as Affected by Different Irradiances During Growth. Photosynthetica, 35(4), 573-578. doi: 10.1023/A:1006935125111
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