Variation of Photosynthetic Gas-exchange Parameters among Soybean Gerplasm
Photosynthesis plays an important role in determining crop's yield. Photosynthetic gas-exchange parameters have been widely used to reflect the photosynthetic capacity of plant. In the present study, pot experiment was conducted to evaluate 162 soybean varieties (lines) for four gas-exchange parameters, photosynthetic rate,stomatal conductance, internal CO2 concentration and transpiration rate, at R6 development stage with portable photosynthesis systems ( LI-6400). The results showed; (ⅰ) the four gas-exchange parameters correlated with each other positively and significantly; (ⅱ)the gas-exchange parameters demonstrated significant difference, wide variation range and quantitative distribution among varieties (lines), suggesting a larger potential for breeding improvement of these parameters; (ⅲ) fifteen varieties (lines) with high photosynthetic rate were selected, which could be used as base materials for future high photosynthetic efficiency breeding.
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