| 查看: 419 | 回复: 1 | ||
[求助]
摘要翻译 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. |
回复此楼» 猜你喜欢
一志愿鲁东大学071000生物学学硕初试分数276求调剂
已经有15人回复
-
308求调剂
已经有17人回复
-
一志愿0807 数一英一 313 有没有二轮调剂
已经有12人回复
-
材料调剂
已经有5人回复
-
289 分105500药学专硕求调剂
已经有3人回复
-
考研调剂-材料类-284
已经有21人回复
-
314求调剂
已经有11人回复
-
0703调剂
已经有19人回复
-
一志愿北京2，材料与化工308求调剂
已经有18人回复
-
086004 求调剂 309
已经有3人回复
Rio2016
木虫 (小有名气)
- 翻译EPI: 72
- 应助: 28 (小学生)
- 贵宾: 0.013
- 金币: 3301.7
- 散金: 25
- 红花: 6
- 帖子: 300
- 在线: 243.3小时
- 虫号: 1910117
- 注册: 2012-07-25
- 专业: 抗肿瘤药物药理
2楼2013-03-14 12:17:16
