Abstract
Male meiotic studies have been performed on plants basis in Deutzia staminea collected from three localities of Parvati valley, Kullu district, Himachal Pradesh, India. The scored accessions uniformly exhibited the diploid chromosome count of 2n=26 confirming the earlier reports from other regions of North-West Himalayas. The individuals studied from Gurthigarh showed perfectly normal meiosis, microsporogenesis and 100% pollen fertility. On the other hand, plants studied from Pulga and Malana showed the existence of multiple associations of chromosomes due to structural heterozygosity for reciprocal translocations. Analysis of 118 countable pollen mother cells (PMCs) showed that 17.8% meiocytes depicted multivalent of ring or chain type involving 2.87% of the chromosomes. Also these individuals showed the phenomenon of cytomixis (6.57% PMCs), chromatin stickiness, and abnormal spindle activity depicted in form of out of plate bivalents, chromatin bridges and laggards. The existence of some pollen sterility (15–29%) in diploid individuals seems to be the consequence of multivalents during metaphase I (MI) and cytomictically induced meiotic irregularities in the PMCs.
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