Correlates of nuclear DNA content in angiosperms have been noted previously for a range of features, cellular to geographic. A new hypothesis, the correlation between nuclear DNA content and reproductive developmental features (after Cavalier-Smith, Journal of Cell Science 34, 247-268. 1978) is posed and tested here. Of three features tested (megasporogenesis, microsporogenesis, and endosperm development), megasporogenesis alone was shown to be correlated with nuclear DNA amount. The hypothesis was examined in 107 families of angiosperms using nonparametric statistics, and in 53 families of monocotyledons and outgroups using a phylogenetic test of association. A correlation was found between large genomes and successive microsporogenesis for all angiosperms, but not for monocots and dicots analyzed separately, thus underlining the importance of taking into account phylogenetic relationships in such studies. A correlation between cellular endosperm and large genomes in dicotyledons needs to be confirmed in a phylogenetic context. A tendency for deviations from monosporic megasporogenesis to occur in taxa that have a nuclear DNA content of over 9.0 pg/C was demonstrated using both phylogenetic and nonphylogenetic tests. It is hypothesized that cytoskeleton dynamics are affected in reproductive cells, enabling decoupling between nuclear and cytoplasmic cell cycles and leading to variation in reproductive development.
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页码
v.440-451(4)
其它主题
Anatomia de la planta; Analisis cuantitativo; Anatomie vegetale; Stade de developpement vegetal; Tecnicas analiticas; Monocotiledoneas; Monocotyledone; Dicotyledone; Division celular
语言
英语
注释
references. AVAILABILITY: US (DNAL 450 Am36).
类型
Journal Article; Journal Part
来源
American-journal-of-botany (USA). (Apr 1996). v. 83(4) p. 440-451.
团体作者
University of California, Davis, CA.
Selskostopanska Akademiya, Sofia (Bulgaria).
2012-11-15
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