Contrasting responses of salinity-stressed salt-tolerant and intolerant winter wheat (Triticum aestivum L.) cultivars to ozone pollution.
Contrasting responses of salinity-stressed salt-tolerant and intolerant winter wheat (Triticum aestivum L.) cultivars to ozone pollution.
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DOI：
10.1016/j.plaphy.2012.01.007
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发表时间：
2012-03
期刊：
影响因子：
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通讯作者：
Y. Zheng;X. Li;Y. Li;B. Miao;H. Xu;M. Simmons;X. H. Yang
中科院分区：
文献类型：
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作者：
Y. Zheng;X. Li;Y. Li;B. Miao;H. Xu;M. Simmons;X. H. Yang
将耐盐型冬小麦DK961和不耐盐型JN17分别播种在无盐（−S）和无盐（+S）箱中，暴露于木炭过滤空气（CF）和高氧（+O3）敞篷箱中30 d。在−S DK961和JN17中，+O3DK961和JN17的光饱和净光合速率（Asat， 26%和24%）、气孔导度（gs， 20%和32%）和叶绿素含量（10%和21%）显著降低，而o3则显著提高了叶面电解质渗漏（13%和39%）、丙二醛含量（9%和23%）、POD活性和ABA含量。然而，这些参数对o3的反应在DK961中显著，而在+S处理的JN17中不显著。DK961的相关系数达到了0.01的显著水平，而JN17在o3和盐度的交互作用下相关性不显著。臭氧对两个品种茎部的影响均大于对根部的影响。结果表明，耐盐品种受盐害较不耐盐品种小，但在+S条件下o3对其伤害较大。因此，选择更强的耐盐性可能不会导致中等（100 mM）盐度区域在高浓度o3存在时的预期产量增加。相反，盐诱导的气孔关闭有效降低了耐盐品种对o3的敏感性。因此，我们认为耐盐冬小麦品种可能很好地适应高盐度（100 ~ 100 mM）和臭氧胁迫地区，而不耐盐冬小麦品种可能适应中、轻盐度高臭氧污染地区。
Contrasting winter wheat cultivars, salt-tolerant DK961 and intolerant JN17, which sown in no salinity (−S) and salinity (+S) boxes were exposed to charcoal filtered air (CF) and elevated O3(+O3) in open top chambers (OTCs) for 30 days. In −S DK961 and JN17 plants, +O3DK961 and JN17 plants had significantly lower light-saturated net photosynthetic rates (Asat, 26% and 24%), stomatal conductance (gs, 20% and 32%) and chlorophyll contents (10% and 21%), while O3considerably increased foliar electrolyte leakage (13% and 39%), malondialdehyde content (9% and 23%), POD activity and ABA content. However, responses of these parameters to O3were significant in DK961 but not in JN17 in +S treatment. Correlation coefficient of DK961 reached significance level of 0.01, but it was not significant in JN17 under interaction of O3and salinity. O3-induced reductions were larger in shoot than in root in both cultivars. Results indicate that the salt-tolerant cultivar sustained less damage from salinity than did the intolerant cultivar but was severely injured by O3under +S condition. Therefore, selecting for greater salt tolerance may not lead to the expected gains in yield in areas of moderate (100 mM) salinity when O3is present in high concentrations. In contrast, salinity-induced stomatal closure effectively reduced sensitivity to O3in the salt-intolerant cultivar. Hence we suggest salt-tolerant winter wheat cultivars might be well adapted to areas of high (>100 mM) salinity and O3stress, while intolerant cultivars might be adaptable to areas of mild/moderate salinity but high O3pollution.