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Altered Circadian Rhythms Regulate Growth Vigour In Hybrids And Allopolyploids

机译:昼夜节律的改变调节杂种和同种多倍体的生长活力。

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Segregating hybrids and stable allopolyploids display morphological vigour, and Arabidopsis allotetraploids are larger than the parents Arabidopsis thaliana and Arabidopsis arenosa-the mechanisms for this are unknown. Circadian clocks mediate metabolic pathways and increase fitness in animals and plants. Here we report that epigenetic modifications of the circadian clock genes CIRCADIAN CLOCK ASSOCIATED 1 (CCA1) and LATE ELONGATED HYPOCOTYL (LHY) and their reciprocal regulators TIMING OF CAB EXPRESSION 1 (TOC1) and GIGANTEA (GI) mediate expression changes in downstream genes and pathways. During the day, epigenetic repression of CCA1 and LHY induced the expression of TOC1, GI and downstream genes containing evening elements in chlorophyll and starch metabolic pathways in allotetraploids and F_1 hybrids, which produced more chlorophyll and starch than the parents in the same environment. Mutations in cca 1 and cca 1 lhy and the daily repression of cca 1 by RNA interference (RNAi) in TOC1::cca 1(RNAi) transgenic plants increased the expression of downstream genes and increased chlorophyll and starch content, whereas constitutively expressing CCA1 or ectopically expressing TOC1::CCA1 had the opposite effect. The causal effects of CCA1 on output traits suggest that hybrids and allopolyploids gain advantages from the control of circadian-mediated physiological and metabolic pathways, leading to growth vigour and increased biomass.
机译:分离的杂种和稳定的异源多倍体表现出形态活力,并且拟南芥的异源四倍体比亲本的拟南芥和拟南芥更大,其机制尚不清楚。昼夜节律钟调节代谢途径并增加动植物的适应性。在这里,我们报告的昼夜节律时钟基因CIRCADIAN CLOCK ASSOCIATED 1(CCA1)和晚期加长的油菜素(LHY)及其相互调节的表观遗传修饰CAB EXPRESSION 1(TOC1)和GIGANTEA(GI)的时序介导下游基因和途径的表达变化。白天,CCA1和LHY的表观遗传抑制诱导了异源四倍体和F_1杂种中叶绿素和淀粉代谢途径中TOC1,GI和下游元件的表达,该基因晚于相同环境下的亲本。 TOC1 :: cca 1(RNAi)转基因植物中cca 1和cca 1 lhy的突变以及RNA干扰(RNAi)对cca 1的每日抑制增加了下游基因的表达并增加了叶绿素和淀粉含量,而组成型表达CCA1或异位表达TOC1 :: CCA1具有相反的效果。 CCA1对输出性状的因果关系表明,杂种和同种多倍体从昼夜节律介导的生理和代谢途径控制中获得优势,从而导致生长活力和生物量增加。

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