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Genetically based differences in photochemical activities of isolated maize (Zea mays L.) mesophyll chloroplasts |
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| Authors: | Holá D Ko?ová M Körnerová M Sofrová D Sopko B |
| Institution: | (1) Department of Genetics and Microbiology, Faculty of Science, Charles University, Viničná 5, CZ-128 44 Praha 2, Czech Republic;(2) Department of Biochemistry, Faculty of Science, Charles University, Albertov 2030, CZ-128 44 Praha 2, Czech Republic;(3) Department of Teaching and Didactics of Chemistry, Faculty of Science, Charles University, Albertov 2030, CZ-128 44 Praha 2, Czech Republic |
| Abstract: | Photochemical activity of isolated mesophyll chloroplasts was measured as Hill reaction activity (HRA) and photosystem 1 (PS1) activity in three diallel crosses of maize (Zea mays L.) inbred lines and F1 hybrids. Statistically significant differences between genotypes together with positive heterotic effect in F1 generation were found for both traits studied. These differences were more pronounced when HRA or PS1 activity was expressed per leaf area unit or dry matter unit compared to the expression per chlorophyll content unit. Analysis of variance showed that both the genetic and non-genetic components of variation in the photochemical activity of isolated mesophyll chloroplasts are present in all three diallel crosses examined. The positive heterosis in F1 hybrids probably arises from non-additive genetic effects of a positive dominance type. Additive genetic effects were also statistically highly significant. We found no differences between reciprocal crosses. This revised version was published online in September 2006 with corrections to the Cover Date. |
| Keywords: | diallel cross genetic analysis heterosis Hill reaction activity photosystem 1 |
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