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首页> 外文期刊>Plant and Soil >The effect of NaCl stress and relief on gas exchange properties of two olive cultivars differing in tolerance to salinity.
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The effect of NaCl stress and relief on gas exchange properties of two olive cultivars differing in tolerance to salinity.

机译：NaCl胁迫和缓解对两个耐盐性不同的橄榄品种气体交换特性的影响。

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Young olive cv. Frantoio and Leccino plants were grown either in hydroponic or soil culture in a greenhouse over two growing seasons. Plants were exposed to NaCl concentrations between 0 and 200 mM for 34-35 days followed by 30-34 days of relief from stress. Salt stress brought about a reduction in net CO2 assimilation and stomatal conductance in both cultivars, but the effect was more pronounced in the salt-tolerant Frantoio than in the salt-sensitive Leccino cultivar. Therefore, gas exchange parameters may be misleading if used to evaluate the salt tolerance of olive genotypes. Recovery in gas exchange parameters during relief from stress was slower in the salt-sensitive cultivar. In general, the decline in assimilation reflected the salt-induced reduction in stomatal conductance, but a marked effect on carboxylation efficiency and CO2 compensation point was measured in plants treated with 200 mM NaCl for four weeks. Frantoio showed a 50% reduction in assimilation and stomatal conductance at 146 and 78 mM leaf Na+ concentration (tissue water molar basis), respectively, whereas the corresponding 50% thresholds for the Leccino were 275 and 264 mM, respectively.
机译：年轻的橄榄简历。 Frantoio和Leccino植物在水培或土壤培养中于温室中生长了两个生长季节。将植物暴露于0至200 mM的NaCl浓度下34-35天，然后缓解30-34天。盐胁迫导致两个品种的净CO2同化和气孔导度降低，但耐盐Frantoio比对盐敏感的Leccino品种的影响更为明显。因此，如果用于评估橄榄基因型的耐盐性，气体交换参数可能会产生误导。在盐敏感品种中，缓解压力时气体交换参数的恢复较慢。通常，同化作用的下降反映了盐诱导的气孔导度降低，但是在用200 mM NaCl处理4周的植物中测得了对羧化效率和CO2补偿点的显着影响。 Frantoio在146和78 mM的叶片Na +浓度（以组织水摩尔为基准）下，同化和气孔导度分别降低了50％，而Leccino的相应50％阈值分别为275和264 mM。

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