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首页> 外文期刊>Functional Plant Biology >Physiological and morphological responses to water stress in Aegilops biuncialis and Triticum aestivum genotypes with differing tolerance to drought.
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Physiological and morphological responses to water stress in Aegilops biuncialis and Triticum aestivum genotypes with differing tolerance to drought.

机译：不同抗旱性的埃及伊蚊和普通小麦基因型对水分胁迫的生理和形态响应。

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摘要

The physiological and morphological responses to water stress induced by polyethylene glycol (PEG) or by withholding water were investigated in A. biuncialis genotypes (Ae1050, Ae 550 and Ae225) differing in the annual rainfall of their habitat (1050, 550 and 225 mm/year) and in wheat genotypes (MV9kr1, Sakha and Capelle Desprez) differing in drought tolerance. A decrease in the osmotic pressure of the nutrient solution from -0.027 to -1.8 MPa resulted in significant water loss, a low degree of stomatal closure and a decrease in the intercellular CO2 concentration (Ci) in Aegilops genotypes originating from dry habitats, while in wheat genotypes, high osmotic stress increased stomatal closure, resulting in a low level of water loss and high Ci. Nevertheless, under saturating light at normal atmospheric CO2 levels, the rate of CO2 assimilation was higher in Aegilops accessions under high osmotic stress compared to wheat genotypes. Moreover, in the wheat genotypes, CO2 assimilation exhibited less or no O2 sensitivity. These physiological responses were manifested in changes in the growth rate and biomass production, since Aegilops (Ae550 and Ae225) genotypes retained a higher growth rate (especially in the roots), biomass production and yield after drought stress than wheat. These results indicate that Aegilops genotypes, originating from a dry habitat have better drought tolerance than wheat, making them good candidates for improving the drought tolerance of wheat through intergeneric crossing.
机译：研究了聚乙二醇（PEG）或滞留水诱导的水分胁迫的生理和形态响应，其基因型为A.biuncialis（Ae1050，Ae 550和Ae225），其栖息地的年降雨量不同（1050、550和225 mm /年）和小麦基因型（MV9kr1，Sakha和Capelle Desprez）在耐旱性方面有所不同。营养液的渗透压从-0.027降低到-1.8 MPa，导致水分大量流失，气孔关闭程度降低以及源自干旱生境的埃及伊蚊基因型的细胞间CO2浓度（Ci）降低，而在小麦的基因型，高渗透胁迫增加了气孔闭合，从而导致低水平的水分流失和高Ci。尽管如此，在正常大气CO2水平下的饱和光下，与小麦基因型相比，在高渗透胁迫下的Aegilops品种的CO2同化率更高。此外，在小麦基因型中，CO2同化显示较少或没有O2敏感性。这些生理反应表现为生长速率和生物量产量的变化，这是因为干旱后的Aegilops（Ae550和Ae225）基因型保持了较高的生长速率（尤其是在根部），生物量产量和单产，高于小麦。这些结果表明，起源于干旱生境的Aegilops基因型具有比小麦更好的耐旱性，使其成为通过种间杂交提高小麦耐旱性的良好候选者。

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