Arabidopsis HECATE genes function in phytohormone control during gynoecium development.
Arabidopsis HECATE genes function in phytohormone control during gynoecium development.
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DOI：
10.1242/dev.120444
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发表时间：
2015-10-01
期刊：
影响因子：
--
通讯作者：
Lohmann JU
中科院分区：
文献类型：
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作者：
Schuster C;Gaillochet C;Lohmann JU
果实是被子植物的生殖器官，也是被子植物中最复杂的结构之一，由花最内轮的受精雌蕊群发育而来。植物激素在花和果实的形成、形态发生和生长过程中起着重要作用，并且有证据表明在这些过程中不同种类的植物激素之间存在相互作用。在这里，我们表明，bHLH转录因子HECATE 1（HEC 1），HEC 2和HEC 3，这以前已被确定为传输道形成的重要组成部分，影响生殖组织发育过程中生长素和细胞分裂素的反应。我们发现，HEC 1与SPATlets（SPT）相互作用，以控制心皮融合，这两个转录因子限制细胞分裂素在雌蕊群的敏感性。此外，HEC 1在生物合成、运输和转录反应水平上紧密整合到生长素信号网络中。基于这些数据，我们建议HEC 1作为一个本地调制器的生长素和细胞分裂素的反应，以控制雌蕊发育拟南芥。突出显示的文章：在植物的生殖组织发育中，HECATE 1和SPATlavin协调生长素和细胞分裂素信号以协调雌蕊群的发育。
The fruit, which develops from the fertilised gynoecium formed in the innermost whorl of the flower, is the reproductive organ and one of the most complex structures of an angiosperm plant. Phytohormones play important roles during flower and fruit patterning, morphogenesis and growth, and there is emerging evidence for a cross-talk between different classes of plant hormones throughout these processes. Here, we show that the bHLH transcription factors HECATE 1 (HEC1), HEC2 and HEC3, which have previously been identified as essential components of transmitting tract formation, affect both auxin and cytokinin responses during reproductive tissue development. We find that HEC1 interacts with SPATULA (SPT) to control carpel fusion and that both transcription factors restrict sensitivity to cytokinin in the gynoecium. In addition, HEC1 is tightly integrated into the auxin-signalling network at the levels of biosynthesis, transport and transcriptional response. Based on this data, we propose that HEC1 acts as a local modulator of auxin and cytokinin responses to control gynoecium development in Arabidopsis. Highlighted article: In the developing reproductive tissue of plants, HECATE 1 and SPATULA coordinate auxin and cytokinin signalling to orchestrate the development of the gynoecium.