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Nature Plants∣小立碗藓受精作用中水的供应以及精子移动最新...

已有 198 次阅读 2018-1-4 15:12 |系统分类:论文交流

2018年1月3日,Nature Plants发表了题为“Physcomitrella MADS-box genes regulate water supply and sperm movement for fertilization”的文章。文章讲述了MIKCC型MADS-box转录因子在小立碗藓受精作用中水的供应以及精子移动中的作用。MIKCC型MADS-box基因冗余地调节茎中的细胞分裂和生长以获得适当的外部水传导,以及用活动鞭毛形成精子。


MIKC经典(MIKCC)型MADS-box基因编码的转录因子在各种发育过程中起作用,其中包括被子植物花器官的决定。对MIKCC型MADS-box家族(包括来自非开花植物的基因)的系统发育分析表明,开花植物中这些基因的数目增加与其功能分化有关;然而,它们在非开花植物中确切功能及其在陆生植物多样化中的演变是未知的。本研究表明,苔藓小立碗藓中MICC型MADS-box基因,以两种方式行使受精作用。对所有六种基因的蛋白质定位,缺失突变体和过表达株系的分析表明,三种MIKCC型MADS-box基因冗余地调节茎中的细胞分裂和生长以获得适当的外部水传导,以及用活动鞭毛形成精子。前者的功能似乎保持在开花植物中,而后者则根据精子的丧失而丢失。


MIKC classic (MIKCC)-type MADS-box genes encode transcription factors that function in various developmental processes, including angiosperm floral organ identity. Phylogenetic analyses of the MIKCC-type MADS-box family, including genes from non-flowering plants, suggest that the increased numbers of these genes in flowering plants is related to their functional divergence; however, their precise functions in non-flowering plants and their evolution throughout land plant diversification are unknown. Here, we show that MIKCC-type MADS-box genes in the moss Physcomitrella patens function in two ways to enable fertilization. Analyses of protein localization, deletion mutants and overexpression lines of all six genes indicate that three MIKCC-type MADS-box genes redundantly regulate cell division and growth in the stems for appropriate external water conduction, as well as the formation of sperm with motile flagella. The former function appears to be maintained in the flowering plant lineage, while the latter was lost in accordance with the loss of sperm.








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