Chloroplast substitution overcomes leaf chlorosis in a Moricandia arvensis-based cytoplasmic male sterile Brassica juncea |
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Authors: | P B Kirti S Prakash K Gaikwad V Dinesh Kumar S R Bhat V L Chopra |
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Institution: | (1) National Research Centre on Plant Biotechnology, IARI, New Delhi, India Fax: +91-11-5766420, IN |
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Abstract: | A male sterile Brassica juncea line based on Moricandia arvensis cytoplasm was developed previously by backcrossing the somatic hybrid M. arvensis+B. juncea, and the gene for restoring fertility was introgressed. The CMS line is very severely chlorotic because of the presence of
alien chloroplasts and flowering is delayed by 30–40 days, making it unsuitable for the exploitation of heterosis. We have
resorted to another cycle of protoplast fusion between green fertile B. juncea and chlorotic male sterile B. juncea, and developed green male-sterile plants. Molecular analysis revealed that in green male-sterile plants chloroplasts of M. arvensis origin were substituted by those from B. juncea, giving rise to intergeneric cytoplasmic hybrids with mitochondria of M. arvensis origin. With the development of dark-green male-sterile plants, the CMS fertility restoration system is suitable for the
production of hybrid mustard.
Received: 23 February 1998 / Accepted: 12 May 1998 |
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Keywords: | Brassica juncea Moricandia arvensis Cytoplasmic male sterility Chlorosis correction Cytoplasmic hybrids Chloroplast substitution |
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