• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Botany >On the Relationship between Pollen Size and Genome Size
【24h】

On the Relationship between Pollen Size and Genome Size

机译：花粉大小与基因组大小的关系

获取原文
       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Here we test whether genome size is a predictor of pollen size. If it were, inferences of ancient genome size would be possible using the abundant paleo-palynolgical record. We performed regression analyses across 464 species of pollen width and genome size. We found a significant positive trend. However, regression analysis using phylogentically independent contrasts did not support the correlated evolution of these traits. Instead, a large split between angiosperms and gymnosperms for both pollen width and genome size was revealed. Sister taxa were not more likely to show a positive contrast when compared to deeper nodes. However, significantly more congeneric species had a positive trend than expected by chance. These results may reflect the strong selection pressure for pollen to be small. Also, because pollen grains are not metabolically active when measured, their biology is different than other cells which have been shown to be strongly related to genome size, such as guard cells. Our findings contrast with previously published research. It was our hope that pollen size could be used as a proxy for inferring the genome size of ancient species. However, our results suggest pollen is not a good candidate for such endeavors.
机译：在这里，我们测试基因组大小是否是花粉大小的预测因子。如果是这样的话，利用丰富的古地理记录就可以推断出古代基因组的大小。我们对464种花粉宽度和基因组大小进行了回归分析。我们发现了明显的积极趋势。但是，使用系统发育独立对比的回归分析不支持这些特征的相关进化。相反，揭示了被子植物和裸子植物在花粉宽度和基因组大小上的巨大差异。与较深的结节相比，姊妹类群不太可能显示出积极的反差。但是，同属物种的数量明显多于偶然的趋势。这些结果可能反映出较小的花粉选择压力。同样，由于花粉粒在测量时不具有代谢活性，因此它们的生物学特性不同于已显示出与基因组大小密切相关的其他细胞，例如保卫细胞。我们的发现与先前发表的研究形成对比。我们希望花粉大小可以用作推断古代物种基因组大小的代理。但是，我们的结果表明，花粉不是进行此类努力的良好选择。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号