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Carbon isotope discrimination varies genetically in c(4) species

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Hubick, K. T., Hammer, G. L., Farquhar, G. D., Wade, L. J., von Caemmerer, S. and Henderson, S. A. (1990) Carbon isotope discrimination varies genetically in c(4) species. Plant physiology, 92 (2). pp. 534-537. ISSN 0032-0889 1532-2548


Article Link: https://doi.org/10.1104/pp.92.2.534

Article URL: https://pubmed.ncbi.nlm.nih.gov/16667310
Article URL: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1062326/


Carbon-isotope discrimination (Delta) is used to distinguish between different photosynthetic pathways. It has also been shown that variation in Delta occurs among varieties of C(3) species, but not as yet, in C(4) species. We now report that Delta also varies among genotypes of sorghum (Sorghum bicolor Moench), a C(4) species. The discrimination in leaves of field-grown plants of 12 diverse genotypes of sorghum was measured and compared with their grain yields. Discrimination varied significantly among genotypes, and there was a significant negative correlation between grain yield and Delta. The variation in Delta may be caused by genetic differences in either leakiness of the bundle-sheath cells or by differences in the ratio of assimilation rate to stomatal conductance. At the leaf level, the former should be related to light-use efficiency of carbon fixation and the latter should be related to transpiration efficiency. Both could relate to the yield of the crop.

Item Type:Article
Additional Information:Open access PDF attached
Subjects:Science > Botany > Plant physiology
Science > Botany > Genetics
Plant culture > Field crops
Plant culture > Field crops > Sorghum
Plant pests and diseases
Live Archive:29 Sep 2020 05:49
Last Modified:03 Sep 2021 16:46

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