Karyology and sex determination in Aglaothamnion oosumiense Itono (Ceramiaceae, Rhodophyta)

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Abstract: 

A cytogenetic investigation on male and female reproductive cells of Aglaothamnion oosumiense Itono indicates that the sexuality of this species might be determined by a sex chromosome. Chromosome counts in female and male gametophytes gave 37 and 36, respectively. Sex ratio of gametophytes was 1:1. Both male-derived and female-derived bisexual plants were observed. Bisexual plants were different in gross morphology and position of carpogonial branches from normal unisexual gametophytes. The chromosome number of female-derived bisexual plants was N=37 and male-derived bisexual plants was N=36. Some male plants developed parasporangia in addition. The paraspore germlings showed the same chromosome number as the male plants. The fertilized carpogonium and gonimoblast cells had 2N = ca. 70 chromosomes.

Author(s): 
Gwang Roon Kim
In Kyu Lee
Ok-Kyong Chah
Keywords: 
Aglaothamnion oosumiense
chromosome
karyology
sex determination
post-fertilization
Rhodophyta
Link / Ref: 
Semantics Scholar
Attachment: 
PDF icon Karyology and sex determination in Aglaothamnion oosumiense Itono (Ceramiaceae, Rhodophyta).pdf
Article Source: 
Hydrobiologia 512: 157-164, 2004
Category: 
Basic Biology
Seaweed composition