Photosynthetic rate in Triticum in relation to ribulose bisphosphate carboxylase (RuBPCase) and leaf conductance.
1990
Xu Zengfu | Fang Zhiwei
Photosynthetic rate (Pn), ribulose 1,5-bisphosphate carboxylase (RuBPCase) and leaf conductance of the sixth and flag leaves of different wheat genotypes were examined to determine whether differences in RuBPCase and leaf conductance could be related to known differences in their Pn. The significant variation in Pn was observed that the wild diploid T. boeoticum had higher Pn than other wheat genotypes. Differences in Pn among wheat genotypes were not explained by differences in RuBPCase, since there was no significant correlation between Pn and RuBPCase activity, specific activity, activation and content, and no significant correlation between Pn and the ratio of RuBPCase protein to total soluble protein. Also, there was no significant correlation between Pn and the stomatal conductance (r=+0.284). On the other hand, higher Pn was associated with higher mesophyll conductance (r=+0.802***, significant at the 0.001 probability), so the variation in Pn among wheat genotypes was to a significant extent attributable to their differences in mesophyll conductance.
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