Abstract:
: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.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Hubick KT,Hammer GL,Farquhar GD,Wade LJ,von Caemmerer S,Henderson SAdoi
10.1104/pp.92.2.534subject
Has Abstractpub_date
1990-02-01 00:00:00pages
534-7issue
2eissn
0032-0889issn
1532-2548journal_volume
92pub_type
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