Cytological, cytohistological and morphological causes for pollen breakdown in two
cytoplasmic genetic male sterile lines MS 577A and IR 58025A were carried out in
comparison with their corresponding maintainer lines (MS 5778 and IR 580258) and a
restorer line (Vajram). The anther sac layers, i.e. the inner tapetum, middle endothecium
and outer epidermis showed slight variation in their thickness at all stages among the lines
but showed normal behaviour in development in both the cytoplasmic genetic male sterile
lines, IR 58025A and MS 577A, as well as their maintainer lines (IR 580258 and MS 5778)
and the restorer (Vajram). In IR 58025A, the critical stage of breakdown was observed to be
at binucleate stage whereas in MS 577A pollen grains were morphologically similar to its
maintainer line but failed to fertile in selfing. The reason for pollen breakdown may be
incompatibility between nuclear and plasma genes.
Keywords: Cytology, histology, CGMS, rice.
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906
S. V. SAl PRASAD AND G. M. RAO info_circle