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首页> 外文期刊>Plant Cell Reports >Comparative physiological and molecular responses of a common aromatic indica rice cultivar to high salinity with non-aromatic indica rice cultivars.
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Comparative physiological and molecular responses of a common aromatic indica rice cultivar to high salinity with non-aromatic indica rice cultivars.

机译：普通芳香rice稻品种与非芳香in稻品种对高盐度的比较生理和分子响应。

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摘要

In an attempt to understand the molecular basis of salt-stress response in the aromatic rice Gobindobhog, a comprehensive analysis encompassing physiological or biochemical assays and gene expression studies under high salt (200 mM NaCl) supply regimes were initiated and compared with a salt-sensitive (M-1-48) and salt-tolerant (Nonabokra) rice. The detrimental effects of salinity stress were the most pronounced in Gobindobhog, as reflected by the maximally increased root to shoot ratio, the highest chlorophyll degeneration, the highest foliar concentration of Na(+) ions and peroxide content, with their maximum increment after salt treatment. The amplification of oxidative damages was further stimulated by the accumulation of putrescine and lipid peroxidation-derived toxic degradation products (increased malondialdehyde and lipoxygenase activity), which were comparable in M-1-48 and Gobindobhog. Antioxidants like anthocyanin and particularly cysteine and the osmolytes like reducing sugar, proline and polyamines (spermidine and spermine) showed the highest level in Nonabokra. While the inhibition of catalase activity occurred in all the varieties following salt-stress, the maximum induction in guaiacol peroxidase activity, elevated cysteine and proline levels in Gobindobhog probably constituted the detoxification mechanism obligatory for its survival. Intensification of the aroma content with salt treatment was markedly noted in Gobindobhog. A very low abundance of Rab16A/SamDC transcript and the corresponding proteins were observed both in M-1-48 and Gobindobhog, induced only after salt-stress, whereas they were constitutively expressed in Nonabokra. Thus, our data reflect Gobindobhog as a salt-sensitive cultivar, susceptible to high-stress-induced growth-inhibition, ion imbalances, membrane/oxidative damages with lower expression of stress-tolerant genes.
机译：为了了解芳香水稻Gobindobhog中盐胁迫响应的分子基础，发起了一项全面的分析，包括在高盐（200 mM NaCl）供给制度下的生理或生化分析和基因表达研究，并将其与对盐敏感的盐进行比较（M-1-48）和耐盐（Nonabokra）大米。盐胁迫的不利影响在戈宾多博格州最为明显，这反映在根茎比最大增加，叶绿素变性最高，Na（+）离子的叶面浓度最高和过氧化物含量最高，而盐处理后它们的增量最大。腐胺和脂质过氧化衍生的毒性降解产物（丙二醛和脂氧合酶活性增加）的积累进一步刺激了氧化损伤的放大，这在M-1-48和Gobindobhog中可比。抗氧化剂如花色苷，尤其是半胱氨酸，渗透剂如还原糖，脯氨酸和多胺（亚精胺和精胺）在Nonabokra中的含量最高。盐胁迫后所有品种的过氧化氢酶活性均受到抑制，但愈创木酚中最大的愈创木酚过氧化物酶活性，半胱氨酸和脯氨酸水平的最大诱导可能构成了其生存所必需的排毒机制。 Gobindobhog中明显注意到用盐处理后香气含量增加。仅在盐胁迫后诱导的M-1-48和Gobindobhog中都观察到非常低的Rab16A / SamDC转录本和相应的蛋白质丰度，而在Nonabokra中组成性表达。因此，我们的数据反映了戈宾多夫犬是一种盐敏感性品种，易受高压力诱导的生长抑制，离子失衡，膜/氧化损伤，且耐胁迫基因的表达较低。

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