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Cytoplasmic Effects on Photosynthetic Activities of Soybean Leaves
Author(s) -
Diethelm R.,
Shibles R.,
Green D. E.,
Shoemaker R. C.
Publication year - 1989
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1989.0011183x002900020021x
Subject(s) - photosynthesis , biology , chloroplast , rubisco , thylakoid , botany , genome , plastid , gene , biochemistry
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 F 1 'S in a field experiment behaved similarly for CO 2 ‐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 ratelimiting 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 F 1 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.