Cytoplasmic effects on photosynthetic activities of soybean leaves.
1989
Diethelm R. | Shibles R. | Green D.E. | Shoemaker R.C.
Many of the thylakoid proteins involved in photosynthesis, as well as the catalytic subunit of ribulose 1,5-bisphosphate carboxylaseoxygenase (rubisco), are encoded in the chloroplast, which is inherited maternally. Different chloroplast genomes might result in different photosynthetic rates or differential regulation of photosynthetic enzymes. Nine soybean lines [Glycine max (L.) Merr. and G. gracilis], representing four different chloroplast genomes, were reciprocally crossed to a common high-photosynthetic parent. Reciprocal F1's in a field experiment behaved similarly for CO2-exchange rate (CER), photosynthetic electron transport, rubisco activity, and soluble protein content. Hence, these traits were not influenced by the different chloroplast genomes, implying that the chloroplast genomes used were not different with respect to genes involved in rate-limiting photosynthesis or any sequence changes were not expressed. Partial dominance for low CER seemed evident in the progeny of parents having large differences in CER. This effect seems to be under nuclear influence because it occurred in both F1 progeny of reciprocal crosses. This partial dominance for low CER appeared in both Glycine species and was mainly due to low protein content resulting in low rubisco activity per leaf area. The performance of the two species in photosynthesis and the related traits was similar.
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