While screening the gennplasm ofcassava lor pollen fertility, diverse types of poUen sterility were
noticed. TIle male sterile clones were n10re frequent among the indigenous than exotic genotypes.
TIlough the male sterile clones of indigenous origin showed empty anthers, those of exotic origin,
except Ce 539, had lOOCliJ sterile pollen of small size. Male sterility among the indigenous strains
resulted from nonseparation 01 microspores lrom the tetrads, which may be due to the suppression
of callase activity. In the exotics, delayed separation of microspores leads to the production of
small sterOe pollen. TIle partial pollen sterility resulted from the cryptic structural hybridity
manifested through aberrant pachytene pairing.
Keywords: Male sterility, tapetum,late disjunction, microspores, callase, cassava.
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906
J. S. JOS, R. B. NAIR AND M. T. SREEKUMARI info_circle