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Journal of Cell Science, Vol 97, 565-570, Copyright © 1990 by Company of Biologists

Submitted on May 3, 1990
Accepted on August 6, 1990

The three-dimensional arrangement of chromosomes at meiotic metaphase I in normal and interchange heterozygotes of Briza humilis

JANET M. MOSS 1 and BRIAN G. MURRAY 1

1 Department of Botany, University of Auckland, Private Bag, Auckland, New Zealand

Author for correspondence

Pollen mother cells at metaphase I have been reconstructed from serial sections in normal and interchange heterozygotes of Briza humilis. The pollen mother cells have an irregular shape with a prominent projection from the tangential face into the anther loculus. The seven bivalents of the normal plant are usually arranged with one bivalent in a central position surrounded by a ring of the remaining six or as a ring of all seven bivalents. The central:peripheral distribution of quadrivalents is different in two different interchange plants; in a sector analysis, where cells are divided into four quarters relative to the tangential face of the pollen mother cell, the two plants also show differences in quadrivalent distribution, indicating that individual chromosomes occupy different positions in the cell. The relevance of these results to the positioning of quadrivalents in lateral squashes of meiotic metaphase I are discussed.

Key words: Briza humilis, 3D reconstruction, interchange heterozygotes, chromosome positioning

Submitted on May 3, 1990
Accepted on August 6, 1990






© The Company of Biologists Ltd 1990