Anther development and the orientation of the interchange quadrivalent in pearl millet

Koduru, P.R.K. and Rao, M.K. and Lakshmi, K.V. and Sybenga, J. (1984) Anther development and the orientation of the interchange quadrivalent in pearl millet. Chromosoma, 90 (2). pp. 89-93.

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The effects of developmental stage of the anther, aging of the plant, inbreeding and season on meiotic segregation of an interchange chain quadrivalent were studied in Pennisetum americanum. The frequency of adjacent orientation (and segregation) increased with developmental stage of the anther, independently of other factors. Plant age and degree of inbreeding had no demonstrable effects, but there was an indication that high temperature favoured adjacent orientation. Chromosome contraction as measured by change in chromosome length appeared to be negligible during metaphase/anaphase. Therefore, increased adjacent orientation cannot readily be explained by metaphase reorientation resulting from the strengthening of chromosomes caused by an increase in their rigidity. It is probable that unorientated or badly orientated quadrivalents observed regularly at early metaphase I continue to straighten out prior to their delayed orientation. When they finally orientate late in metaphase, their orientation will more likely be adjacent than alternate

Item Type: Article
Author Affiliation: Botany Department, Andhra University, Waltair 530 003, India
Subjects: Crop Improvement > Genetics/Genomics
Crop Improvement > Plant Breeding
Divisions: Millet
Depositing User: Ms K Syamalamba
Date Deposited: 31 May 2012 03:59
Last Modified: 31 May 2012 03:59
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