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Correction of chlorophyll deficiency in alloplasmic male sterile Brassica juncea through recombination between chloroplast genomes

Published online by Cambridge University Press:  14 April 2009

P. B. Kirti ,
S. B. Narasimhulu ,
T. Mohapatra ,
S. Prakash  and
V. L. Chopra
P. B. Kirti
Affiliation:
Biotechnology Centre, Indian Agricultural Research Institute, New Delhi- 110012, India
S. B. Narasimhulu
Affiliation:
Biotechnology Centre, Indian Agricultural Research Institute, New Delhi- 110012, India
T. Mohapatra
Affiliation:
Biotechnology Centre, Indian Agricultural Research Institute, New Delhi- 110012, India
S. Prakash
Affiliation:
Biotechnology Centre, Indian Agricultural Research Institute, New Delhi- 110012, India
V. L. Chopra*
Affiliation:
Biotechnology Centre, Indian Agricultural Research Institute, New Delhi- 110012, India
*
*Corresponding author.

Summary

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Brassica juncea cv. Pusa Bold carrying B. oxyrrhina cytoplasm (oxy cytoplasm) was male sterile and chlorotic under field conditions at low temperature (Prakash & Chopra, 1990). Leaf protoplasts of the chlorotic male sterile alloplasmic line (2n = 36) were fused with hypocotyl protoplasts of green male fertile, B. juncea cv. RLM-198 (2n = 36) using polyethylene glycol. Of the 1043 plants regenerated from 10 fusion experiments, 123 had ‘gigas’ features and were identified as presumptive fusion products. Among field-grown population, one plant was dark green even at low temperatures and male sterile. It possessed 72 chromosomes which formed 36 bivalents at late diakinesis of meiosis-I. This plant was back-crossed to B. juncea cv. Pusa Bold (the maintainer line) for three successive generations. One male sterile, normal green BC3 progeny plant with 2n = 36 was analyzed for organelle constitution. Probing its total DNA with the mitochondrial gene for cytochrome oxidase subunit I revealed that it possessed mitochondria of B. oxyrrhina. Southern hybridization pattern with the gene for ribulose bisphosphate carboxylase oxygenase-large subunit (rbcL) revealed that the chloroplast genome of the chlorophyll deficiencycorrected plant had characteristics of both B. juncea and B. oxyrrhina. The deficiency correction has been attributed to recombination between chloroplast genomes of the two species.

Type
Research Article
Information
Genetics Research , Volume 62 , Issue 1 , August 1993 , pp. 11 - 14
Copyright
Copyright © Cambridge University Press 1993

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