Zhang Feng-Ping, Zhang Shi-Bao
College of Traditional Chinese Medicine, Yunnan University of Chinese Medicine, Kunming, China.
Key Laboratory of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China.
Front Plant Sci. 2021 Dec 16;12:793516. doi: 10.3389/fpls.2021.793516. eCollection 2021.
Genome size is known to influence phenotypic traits in leaves and seeds. Although genome size is closely related to cellular and developmental traits across biological kingdoms, floral longevity is a floral trait with important fitness consequence, but less is known about the link between floral longevity and sizes of genomes and cells. In this study, we examined evolutionary coordination between genome size, floral longevity, and epidermal cell size in flowers and leaves in 13 species. We found that, across all the study species, the genome size was positively correlated with floral longevity but negatively associated with labellum epidermal cell size, and a negative relationship was found between floral longevity and labellum epidermal cell size. This suggested that genome size is potentially correlated with floral longevity, and genome size has an important impact on life-history trait. In addition, genome size was positively correlated with leaf epidermal cell size, which was different from the relationship in flower due to different selective pressures they experienced or different functions they performed. Therefore, genome size constraints floral longevity, and it is a strong predictor of cell size. The impact of genome size on reproduction might have more implications for the evolution of flowering plants and pollination ecology.
已知基因组大小会影响叶片和种子的表型性状。尽管基因组大小与生物界的细胞和发育性状密切相关，但花寿命是一种具有重要适合度后果的花性状，然而关于花寿命与基因组和细胞大小之间的联系却知之甚少。在本研究中，我们调查了13个物种花和叶中基因组大小、花寿命及表皮细胞大小之间的进化协同关系。我们发现，在所有研究物种中，基因组大小与花寿命呈正相关，但与唇瓣表皮细胞大小呈负相关，并且花寿命与唇瓣表皮细胞大小之间呈负相关。这表明基因组大小可能与花寿命相关，且基因组大小对生活史性状有重要影响。此外，基因组大小与叶表皮细胞大小呈正相关，这因它们所经历的选择压力不同或所执行的功能不同而与花中的关系有所不同。因此，基因组大小限制花寿命，且是细胞大小的有力预测指标。基因组大小对繁殖的影响可能对开花植物的进化和传粉生态学有更多启示。
