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北京石油化工學(xué)院2026年研究生招生接收調(diào)劑公告

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千尋@德院

銅蟲 (小有名氣)

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注冊(cè): 2011-12-01
專業(yè): 植物生理與生化

[求助] 摘要翻譯求助

A key innovation of flowering plants is the female reproductive organ, the carpel. Here, we show that a mechanism that regulates carpel margin development in the model flowering plant Arabidopsis thaliana was recruited from light-regulated processes. This recruitment followed the loss from the basic helix-loop-helix transcription factor SPATULA (SPT) of a domain previously responsible for its negative regulation by phytochrome. We propose that the loss of this domain was a prerequisite for the light-independent expression in female reproductive tissues of a genetic module that also promotes shade avoidance responses in vegetative organs. Striking evidence for this proposition is provided by the restoration of wild-type carpel development to spt mutants by low red/far-red light ratios, simulating vegetation shade, which we show to occur via phytochrome B, PHYTOCHROME INTERACTING FACTOR4 (PIF4), and PIF5. Our data illustrate the potential of modular evolutionary events to generate rapid morphological change and thereby provide a molecular basis for neo-Darwinian theories that describe this nongradualist phenomenon. Furthermore, the effects shown here of light quality perception on carpel development lead us to speculate on the potential role of light-regulated mechanisms in plant organs that, like the carpel, form within the shade of surrounding tissues.

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1樓 2013-03-13 21:34:49

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Rio2016

木蟲 (小有名氣)

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蟲號(hào): 1910117
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專業(yè): 抗腫瘤藥物藥理

【答案】應(yīng)助回帖

★
sltmac: 金幣+1 2013-04-19 08:06:43

雌性生殖器官：心皮對(duì)有花植物是一個(gè)關(guān)鍵的革新。本文將展示一種來自光調(diào)節(jié)過程的機(jī)制，它能調(diào)節(jié)模式有花植物擬南芥心皮邊緣的生長(zhǎng)。

贊一下

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寥寥數(shù)年、將就過活

2樓2013-03-14 12:17:16

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