CYTOLOGIA
Online ISSN : 1348-7019
Print ISSN : 0011-4545
Seed Ageing and Meiotic Chromosomal Abnormalities in Lettuce
N. K. RaoE. H. Roberts
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1989 年 54 巻 2 号 p. 373-379

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Meiotic chromosomal abnormalities observed in lettuce plants grown from aged seeds increased with the decrease in the viability of the seed lot. Univalents, fragments and a few cases of precocious segregation were observed in metaphase I. Abnormalities found at anaphase I and anaphase II included dicentric bridges with or without fragments, acentric fragments and lagging chromosomes and chromatids.
The spread of the distribution for pollen and seed sterility increased considerably in some ageing treatments; however, average pollen and seed fertilities were not significantly different from the control.

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© The Japan Mendel Society
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