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淀粉作为调控植物生长的一个主要参数

(2009-08-26 08:34:11)
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淀粉作为调控植物生长的一个主要参数

 

    随着食品和生物能源需求的上升,使得培育作物增加产量成为急需解决的问题。营养的获取或发育程序可驱动植物的营养生长。本文选了94份拟南芥材料,其代谢谱显示生物量与大量代谢物呈负相关,特别是淀粉。淀粉在白天积累,在夜间降解,可为植物生长提供持续的碳源。多变量分析表明,淀粉是整个代谢反应的一个主要参数。我们推测,这个反映了平衡生长所需碳源的调控变化。其中21份材料中的转录谱研究显示,超过70个碳调控基因的转录本的协调改变,并且鉴定了与生物量相关转录的2个基因(肌醇- 1 -磷酸合酶和Kelch域蛋白)。这2个位点的等位变异的影响由关联作图分析表现出来,可将它们确定为增加生物量的候选基因。

 

Starch as a major integrator in the regulation of plant growth

 

Rising demand for food and bioenergy makes it imperative to breed for increased crop yield. Vegetative plant growth could be driven by resource acquisition or developmental programs. Metabolite profiling in 94 Arabidopsis accessions revealed that biomass correlates negatively with many metabolites, especially starch. Starch accumulates in the light and is degraded at night to provide a sustained supply of carbon for growth. Multivariate analysis revealed that starch is an integrator of the overall metabolic response. We hypothesized that this reflects variation in a regulatory network that balances growth with the carbon supply. Transcript profiling in 21 accessions revealed coordinated changes of transcripts of more than 70 carbon-regulated genes and identified 2 genes (myo-inositol-1-phosphate synthase, a Kelch-domain protein) whose transcripts correlate with biomass. The impact of allelic variation at these 2 loci was shown by association mapping, identifying them as candidate lead genes with the potential to increase biomass production.

  

(本消息来源自:http://www.pnas.org/content/106/25/10348.abstract?etoc)

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