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首页> 外文期刊>Journal of Plant Physiology >Atnoa1 mutant Arabidopsis plants induce compensation mechanisms to reduce the negative effects of the mutation.
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Atnoa1 mutant Arabidopsis plants induce compensation mechanisms to reduce the negative effects of the mutation.

机译：Atnoa1 突变体拟南芥植物诱导补偿机制以减少突变的负面影响。

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摘要

Alterations in temperature adaptation processes and changes in the content of stress-related compounds, polyamines and salicylic acid were evaluated in Atnoa1 (NO-associated 1) Arabidopsis mutant. The Fv/Fm chlorophyll-a fluorescence induction parameter and the actual quantum yield were significantly lower in the Atnoa1 mutant than in the wild-type. In the wild-type Col-0, the fastest increase in the non-photochemical quenching (NPQ) occurred in plants pre-treated at low temperature (4 degrees C), while the slowest was in those adapted to 30 degrees C. The NPQ showed not only a substantially increased level in the light-adapted state, but also more rapid light induction after the dark-adapted state in the Atnoa1 mutant than in the wild-type. The results of freezing tests indicated that both the wild-type and the mutant had better freezing tolerance after cold hardening, since no significant differences were found between the genotypes. The level of putrescine increased substantially, while that of spermine decreased by the end of the cold-hardening (4 degrees C, 4 d) period. The quantity of spermidine in Atnoa1 was significantly higher than in Col-0, at both control and cold-hardening temperatures. A similar trend was observed for spermine, but only under control conditions. The mutant plants showed substantially higher salicylic acid (SA) contents for both the free and bound forms. This difference was significant not only in the control, but also in the cold-hardened plants. These results suggest that there is a compensation mechanism in Atnoa1 mutant Arabidopsis plants to reduce the negative effects of the mutation. These adaptation processes include the stimulation of photoprotection and alterations in the SA and polyamine compositions.
机译：在 Atnoa1 （与NO相关的1个）拟南芥突变体中评估了温度适应过程的变化以及胁迫相关化合物，多胺和水杨酸含量的变化。 F v / F m 叶绿素-a的荧光诱导参数和实际量子产率在 Atnoa1 突变体比野生型中的突变体好。在野生型Col-0中，非光化学猝灭（NPQ）的增加最快发生在低温（4摄氏度）预处理的植物中，而最慢的发生在适应30摄氏度的植物中。不仅显示出在光适应状态下的水平显着提高，而且在 Atnoa1 突变体中在黑暗适应状态后的光诱导比野生型更快。冷冻试验的结果表明，野生型和突变体在冷硬化后均具有更好的冷冻耐受性，因为在基因型之间没有发现显着差异。到冷硬化期（4摄氏度，4天）结束时，腐胺的水平大幅上升，而精胺的水平下降。在控制温度和冷硬化温度下， Atnoa1 中亚精胺的数量均显着高于Col-0。对于精胺观察到类似的趋势，但是仅在对照条件下。对于游离形式和结合形式，突变植物均显示出明显更高的水杨酸（SA）含量。这种差异不仅在对照中，而且在冷硬化植物中也很明显。这些结果表明，在 Atnoa1 突变体拟南芥植物中存在补偿机制，以减少突变的负面影响。这些适应过程包括光保护的刺激以及SA和多胺组合物中的改变。

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