Indian Society of Genetics & Plant Breeding

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INTERACTION EFFECTS IN HEXAPLOID WHEAT INVOLVING AEGILOPS COMOSA CHROMOSOMES AND CYTOPLASM

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Interaction studies of nucleus and cytoplasm in aIIoplasmic hybrids involving one or two
chromosomes of cytoplasm donor, Aegilops comosa (2n = 14), and genomes of seven
varieties of common wheat, Triticum aestivum (2n =42), were made. The plants normally
exhibited delayed heading, reduced vigour, complete male.sterility and partial or complete
male fertility. On the contrary, however, some of the 43- and 44-chromosome plants showed
considerable restoration of male fertility with normal or increased vigour and set normal
seeds after selfing. Meiotic analysis showed two critical comosa chromosomes involved in
interaction for fertility restoration which were identified to be median or submedian and
satellite (nucleolus organizing) chromosomes. In addition, some undesirable side effects
on the morphology of some plants were also observed which need rectification.
 

Keywords: Triticum aestivum, Aegilops comosa, alloplasmic addition lines, nucleocytoplasmic interaction, fertility restoration.

Info

Year: 1996
Volume: 56
Issue: 2
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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