Abstract

In pollen mother cells of triploid Petunia axillaris (Lam.) B. S. P. at the stage of late diakinesis some of the chain trivalents revealed an unusual form of rigidity. These are here described as “hook-shaped”, although earlier documented as ‘L’ shaped chain trivalents (Reddi and Padmaja 1979). The other point considered was whether a similar form of rigidity is also true for some rod bivalents, where the single chiasma was terminalized. Such“ paranormal bivalents” were in fact observed. The corresponding observation of hook-shaped trivalents at late diakinesis is interpreted to be a factor that could limit the frequency of alternate orientation and incidentally increase the frequency of adjacent orientation of such chains at metaphase I.

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