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首页> 美国卫生研究院文献>Frontiers in Plant Science >Physiological and growth responses to water deficit in the bioenergy crop Miscanthus x giganteus
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Physiological and growth responses to water deficit in the bioenergy crop Miscanthus x giganteus

机译：生物能源作物Miscanthus x giganteus对缺水的生理和生长响应

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High yielding perennial biomass crops of the species Miscanthus are widely recognized as one of the most promising lignocellulosic feedstocks for the production of bioenergy and bioproducts. Miscanthus is a C4 grass and thus has relatively high water use efficiency. Cultivated Miscanthus comprises primarily of a single clone, Miscanthus x giganteus, a sterile hybrid between M. sacchariflorus and M. sinensis. M. x giganteus is high yielding and expresses desirable combinations of many traits present in the two parental species types; however, it responds poorly to low water availability. To identify the physiological basis of the response to water stress in M. x giganteus and to identify potential targets for breeding improvements we characterized the physiological responses to water-deficit stress in a pot experiment. The experiment has provided valuable insights into the temporal aspects of drought-induced responses of M. x giganteus. Withholding water resulted in marked changes in plant physiology with growth-associated traits among the first affected, the most rapid response being a decline in the rate of stem elongation. A reduction in photosynthetic performance was among the second set of changes observed; indicated by a decrease in stomatal conductance followed by decreases in chlorophyll fluorescence and chlorophyll content. Measures reflecting the plant water status were among the last affected by the drought treatment. Metabolite analysis indicated that proline was a drought stress marker in M. x giganteus, metabolites in the proline synthesis pathway were more abundant when stomatal conductance decreased and dry weight accumulation ceased. The outcomes of this study in terms of drought-induced physiological changes, accompanied by a proof-of-concept metabolomics investigation, provide a platform for identifying targets for improved drought-tolerance of the Miscanthus bioenergy crop.
机译：芒草种的高产多年生生物量作物被广泛认为是生产生物能源和生物产品的最有前景的木质纤维素原料之一。芒草是C4草，因此具有较高的用水效率。栽培的芒草主要由单个克隆，芒草x糖衣藻和中华芒草的无菌杂种组成。 M. x giganteus高产，表达两种亲本物种类型中许多性状的理想组合。但是，它对水供应不足的响应很差。为了确定M. x giganteus对水分胁迫响应的生理基础，并确定育种改良的潜在目标，我们在盆栽试验中对水分亏缺胁迫的生理响应进行了表征。该实验提供了宝贵的见解，以了解干旱引起的巨型墨西哥卷柏反应的时态。禁水使受影响的植物生理发生显着变化，其中最主要的影响是生长相关性状，最迅速的响应是茎伸长率下降。在观察到的第二组变化中，光合性能下降。表明气孔导度降低，随后叶绿素荧光和叶绿素含量降低。反映植物水分状况的措施是受干旱影响的最后一项措施。代谢物分析表明，脯氨酸是雄性无花果中的干旱胁迫标记，当气孔导度降低且干重积累停止时，脯氨酸合成途径中的代谢产物更加丰富。这项研究的结果在干旱引起的生理变化方面，并伴随有概念验证的代谢组学研究，为确定提高芒草生物能源作物的耐旱性的目标提供了平台。

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