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首页> 外文期刊>Journal of Experimental Botany >Augmentation of abscisic acid (ABA) levels by drought does not induce short-term stomatal sensitivity to CO2 in two divergent conifer species
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Augmentation of abscisic acid (ABA) levels by drought does not induce short-term stomatal sensitivity to CO2 in two divergent conifer species

机译：干旱增加脱落酸（ABA）的水平不会引起两种不同针叶树种对CO 2 的短期气孔敏感性

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摘要

The stomata of conifers display very little short-term response to changes in atmospheric CO2 concentration (Ca), whereas the stomatal responses of angiosperms to Ca increase in response to water stress. This behaviour of angiosperm stomata appears to be dependent on foliar levels of abscisic acid (ABAf). Here two alternative explanations for the stomatal insensitivity of conifers to Ca are tested: that conifers have either low ABAf or a higher or absent threshold for ABA-induced sensitivity. The responsiveness of stomatal conductance (gs) to a sequence of transitions in Ca (386, 100, and 600 μmol mol−1) was recorded over a range of ABAf in an angiosperm and two divergent conifer species. The different ABA levels were induced by a mild drought cycle. Although the angiosperm and conifer species showed similar proportional increases in ABAf following drought, conifer stomata remained insensitive to changes in Ca whereas angiosperm stomata showed enhanced sensitivity with increasing ABAf. The conifers, however, had much higher ABAf prior to drought than the angiosperm species, suggesting that non-sensitivity to Ca in these conifers was due to an absent or inactive response/signalling pathway rather than insufficient ABAf.
机译：针叶树的气孔对大气CO 2 浓度（C a ）变化的短期响应很小，而被子植物的气孔对C a < / sub>响应水分胁迫而增加。被子植物气孔的这种行为似乎取决于脱落酸（ABA f ）的叶面水平。这里测试了针叶树对C a 的气孔不敏感性的两种替代解释：针叶树的ABA f 较低或ABA诱导的敏感性较高或不存在阈值。气孔电导（g s ）对C a （386、100和600μmolmol -1 ）中一系列转变序列的响应性在被子植物和两种不同的针叶树种中的ABA f 范围内记录到了该基因。温和的干旱周期诱导了不同的ABA水平。虽然干旱后被子植物和针叶树种的ABA f 呈比例增加，但针叶树的气孔对C a 的变化不敏感，而被子植物的气孔随着ABA a的增加而增强。 > f 。然而，针叶树在干旱前的ABA f 比被子植物高得多，这表明这些针叶树对C a 的不敏感性是由于缺少或不活跃响应/信号通路，而不是不足的ABA f 。

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