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六种冬小麦基因型对干旱的代谢响应。

Metabolic response to drought in six winter wheat genotypes.

机构信息

Department of Food and Nutrition Research, Faculty of Food Technology, Josip Juraj Strossmayer University of Osijek, Osijek, Croatia.

Department of Zoology, Plant Protection Institute, Centre for Agricultural Research of the Hungarian Academy of Sciences, Budapest, Hungary.

出版信息

PLoS One. 2019 Feb 19;14(2):e0212411. doi: 10.1371/journal.pone.0212411. eCollection 2019.

Abstract

Wheat is one of the most important cereals, whose growth and development is strongly limited by drought. This study investigated the physiological and metabolic response of six winter wheat cultivars to drought with the emphasis on the induction of dominant metabolites affected by the treatment and genotypes or both. The plants were exposed to a moderate (non-lethal) drought stress, which was induced by withholding watering for six days under controlled greenhouse conditions. A decline in CO2 assimilation (Pn) and transpiration rate, stomata closure, a decrease in relative water content (RWC) and increase of malondialdehyde content were observed in drought-treated plants of all cultivars. These changes were most pronounced in Ellvis, while Soissons was able to retain the higher RWC and Pn. Among the studied metabolites, sugars (sucrose, glucose, fructose, several disaccharides), organic acids (malic acid, oxalic acids), amino acids (proline, threonine, gamma-aminobutyric acid (GABA), glutamine) and sugar alcohols such as myo-inositol accumulated to higher levels in the plants exposed to drought stress in comparison with the control. The accumulation of several metabolites in response to drought differed between the genotypes. Drought induced the production of sucrose, malic acid and oxalic acid, unknown organic acid 1, unknown disaccharide 1, 2 and 3, GABA, L-threonine, glutamic acid in four (Soissons, Žitarka, Antonija or Toborzó) out of six genotypes. In addition, Soissons, which was the most drought tolerant genotype, accumulated the highest amount of unknown disaccharide 5, galactonic and phosphoric acids. The two most drought sensitive cultivars, Srpanjka and Ellvis, demonstrated different metabolic adjustment in response to the stress treatment. Srpanjka responded to drought by increasing the amount of glucose and fructose originated from hydrolyses of sucrose and accumulating unidentified sugar alcohols 1 and 2. In Ellvis, drought caused inhibition of photosynthetic carbon metabolism, as evidence by the decreased Pn, gs, RWC and accumulation levels of sugar metabolites (sucrose, glucose and fructose). The results revealed the differences in metabolic response to drought among the genotypes, which drew attention on metabolites related with general response and on those metabolites which are part of specific response that may play an important role in drought tolerance.

摘要

小麦是最重要的谷物之一,其生长和发育受到干旱的强烈限制。本研究通过强调受处理和基因型或两者影响的优势代谢物的诱导,研究了六种冬小麦品种对干旱的生理和代谢反应。在受控温室条件下,将植物暴露于适度(非致死)干旱胁迫下,通过停止浇水六天来诱导干旱胁迫。在所有品种的干旱处理植物中观察到 CO2 同化(Pn)和蒸腾速率下降、气孔关闭、相对水含量(RWC)下降和丙二醛含量增加。这些变化在 Ellis 中最为明显,而 Soissons 能够保持较高的 RWC 和 Pn。在所研究的代谢物中,糖(蔗糖、葡萄糖、果糖、几种二糖)、有机酸(苹果酸、草酸)、氨基酸(脯氨酸、苏氨酸、γ-氨基丁酸(GABA)、谷氨酰胺)和糖醇如肌醇在暴露于干旱胁迫的植物中积累水平高于对照。与对照相比,几种代谢物在基因型之间的差异对干旱的响应不同。干旱诱导了蔗糖、苹果酸和草酸、未知有机酸 1、未知二糖 1、2 和 3、GABA、L-苏氨酸、谷氨酸在六个基因型中的四个(Soissons、Žitarka、Antonija 或 Toborzó)中产生。此外,Soissons 是最耐旱的基因型,积累了最高量的未知二糖 5、半乳糖酸和磷酸。两个最耐旱的品种 Srpanjka 和 Ellis 对胁迫处理表现出不同的代谢调节。Srpanjka 通过增加蔗糖水解产生的葡萄糖和果糖的量并积累未鉴定的糖醇 1 和 2 来响应干旱。在 Ellis 中,干旱导致光合碳代谢受到抑制,这表现在 Pn、gs、RWC 和糖代谢物(蔗糖、葡萄糖和果糖)的积累水平下降。结果表明,基因型之间对干旱的代谢反应存在差异,这引起了对与一般反应相关的代谢物以及可能在耐旱性中起重要作用的特定反应部分的代谢物的关注。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/584e/6380608/6a513e91227f/pone.0212411.g001.jpg

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