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首页> 美国卫生研究院文献>Frontiers in Plant Science >Changes in free polyamine levels expression of polyamine biosynthesis genes and performance of rice cultivars under salt stress: a comparison with responses to drought
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Changes in free polyamine levels expression of polyamine biosynthesis genes and performance of rice cultivars under salt stress: a comparison with responses to drought

机译：盐胁迫下水稻游离多胺水平的变化多胺生物合成基因的表达以及水稻品种的性能：与干旱反应的比较

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Soil salinity affects a large proportion of rural area and limits agricultural productivity. To investigate differential adaptation to soil salinity, we studied salt tolerance of 18 varieties of Oryza sativa using a hydroponic culture system. Based on visual inspection and photosynthetic parameters, cultivars were classified according to their tolerance level. Additionally, biomass parameters were correlated with salt tolerance. Polyamines have frequently been demonstrated to be involved in plant stress responses and therefore soluble leaf polyamines were measured. Under salinity, putrescine (Put) content was unchanged or increased in tolerant, while dropped in sensitive cultivars. Spermidine (Spd) content was unchanged at lower NaCl concentrations in all, while reduced at 100 mM NaCl in sensitive cultivars. Spermine (Spm) content was increased in all cultivars. A comparison with data from 21 cultivars under long-term, moderate drought stress revealed an increase of Spm under both stress conditions. While Spm became the most prominent polyamine under drought, levels of all three polyamines were relatively similar under salt stress. Put levels were reduced under both, drought and salt stress, while changes in Spd were different under drought (decrease) or salt (unchanged) conditions. Regulation of polyamine metabolism at the transcript level during exposure to salinity was studied for genes encoding enzymes involved in the biosynthesis of polyamines and compared to expression under drought stress. Based on expression profiles, investigated genes were divided into generally stress-induced genes (ADC2, SPD/SPM2, SPD/SPM3), one generally stress-repressed gene (ADC1), constitutively expressed genes (CPA1, CPA2, CPA4, SAMDC1, SPD/SPM1), specifically drought-induced genes (SAMDC2, AIH), one specifically drought-repressed gene (CPA3) and one specifically salt-stress repressed gene (SAMDC4), revealing both overlapping and specific stress responses under these conditions.
机译：土壤盐分影响了很大一部分农村地区，并限制了农业生产力。为了研究对土壤盐分的差异适应性，我们使用水培系统研究了18个水稻品种的耐盐性。基于外观检查和光合参数，根据品种的耐性水平对其进行分类。另外，生物量参数与耐盐性相关。多胺经常被证明参与植物的逆境反应，因此测定了可溶性叶多胺。在盐度下，腐胺的含量保持不变或增加，而敏感品种的腐胺含量下降。在较低的NaCl浓度下，亚精胺（Spd）的含量均保持不变，而在敏感品种中，在100 mM NaCl下，亚精胺（Spd）的含量却降低。所有品种中精胺（Spm）含量均增加。与来自21个品种的长期，中等干旱胁迫下的数据进行的比较表明，两种胁迫条件下Spm均增加。尽管Spm在干旱下成为最突出的多胺，但在盐胁迫下，所有三种多胺的含量相对相似。在干旱和盐胁迫下，Put水平均降低，而在干旱（减少）或盐（不变）条件下，Spd的变化有所不同。研究了在盐分暴露过程中多胺代谢在转录水平上的调控，研究了编码参与多胺生物合成的酶的基因，并将其与干旱胁迫下的表达进行了比较。根据表达谱，将研究的基因分为一般应激诱导基因（ADC2，SPD / SPM2，SPD / SPM3），一种一般应激抑制基因（ADC1），组成型表达基因（CPA1，CPA2，CPA4，SAMDC1，SPD / SPM1），特别是干旱诱导的基因（SAMDC2，AIH），一个特别是干旱抑制的基因（CPA3）和一个特别是盐胁迫抑制的基因（SAMDC4），揭示了在这些条件下的重叠和特异性胁迫响应。

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