Cytoplasm Influences the Photosynthetic Efficiency in Brassica carinata

Cytoplasmic effects on the photosynthesis was investigated in experimentally produced Brassica carinatas of reciprocal cytoplasmic origin. These are obtained by hybridizing B. nigra x B. oleracea var. italica ( B. carinata 226) and B. oleracea x B. nigra ( B. carinata 241). Natural B. carinata and the two parents viz. B. nigra and B. oleracea var. italica were also included in this study. It was observed that the rate of photosynthesis in B. carinata 226 with nigra cytoplasm, and natural B. carinata was higher than that of B. carinata 241 with oleracea cytoplasm. This was substantiated by the diurnal values of photosynthesis among these cultivars. The result indicated that the cytoplasm does affect the rate of photosynthesis in B. carinata and high photosynthetic efficiency in natural B. carinata was due to B. nigra maternal parent.