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首页> 外文期刊>Journal of Experimental Botany >Terminal drought-tolerant pearl millet [Pennisetum glaucum (L.) R. Br.] have high leaf ABA and limit transpiration at high vapour pressure deficit.
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Terminal drought-tolerant pearl millet [Pennisetum glaucum (L.) R. Br.] have high leaf ABA and limit transpiration at high vapour pressure deficit.

机译：最终耐旱的珍珠粟[（L.）R. Br。]具有较高的叶片ABA，并且在高蒸气压下限制了蒸腾作用。

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It was previously shown that pearl millet genotypes carrying a terminal drought tolerance quantitative trait locus (QTL) had a lower transpiration rate (Tr; g cm-2 d-1) under well-watered conditions than sensitive lines. Here experiments were carried out to test whether this relates to leaf abscisic acid (ABA) and Tr concentration at high vapour pressure deficit (VPD), and whether that leads to transpiration efficiency (TE) differences. These traits were measured in tolerant/sensitive pearl millet genotypes, including near-isogenic lines introgressed with a terminal drought tolerance QTL (NIL-QTLs). Most genotypic differences were found under well-watered conditions. ABA levels under well-watered conditions were higher in tolerant genotypes, including NIL-QTLs, than in sensitive genotypes, and ABA did not increase under water stress. Well-watered Tr was lower in tolerant than in sensitive genotypes at all VPD levels. Except for one line, Tr slowed down in tolerant lines above a breakpoint at 1.40-1.90 kPa, with the slope decreasing >50%, whereas sensitive lines showed no change in that Tr response across the whole VPD range. It is concluded that two water-saving (avoidance) mechanisms may operate under well-watered conditions in tolerant pearl millet: (i) a low Tr even at low VPD conditions, which may relate to leaf ABA; and (ii) a sensitivity to higher VPD that further restricts Tr, which suggests the involvement of hydraulic signals. Both traits, which did not lead to TE differences, could contribute to absolute water saving seen in part due to dry weight increase differences. This water saved would become critical for grain filling and deserves consideration in the breeding of terminal drought-tolerant lines.
机译：以前的研究表明，在极端条件下，携带最终耐旱定量性状（QTL）的珍珠粟基因型蒸腾速率较低（Tr; g cm -2 d -1 ）。条件比敏感线路要好。在这里进行实验以测试这是否与高蒸气压亏缺（VPD）时的叶片脱落酸（ABA）和Tr浓度有关，以及是否导致蒸腾效率（TE）差异。这些性状是在耐受/敏感的珍珠粟基因型中进行测量的，包括以终端干旱耐受性QTL（NIL-QTL）渗入的近等基因系。大多数基因型差异是在水分充足的条件下发现的。耐旱基因型（包括NIL-QTL）在水分充足条件下的ABA水平高于敏感基因型，并且在水分胁迫下ABA并未升高。在所有VPD水平下，水分充足的Tr的耐受性均低于敏感基因型。除一条线外，Tr在1.40-1.90 kPa的断点以上的耐受线中减慢，斜率降低> 50％，而敏感线在整个VPD范围内均未显示该Tr响应变化。结论是，在耐水的珍珠粟中，在节水的条件下，有两种节水（避免）机理：（i）即使在低VPD条件下，Tr值也很低，这可能与叶片ABA有关; （ii）对更高VPD的敏感性进一步限制了Tr，这暗示了液压信号的参与。不会导致TE差异的这两个性状可能有助于绝对节水，部分原因是干重增加差异。节省的水对于灌浆至关重要，在终端耐旱品系的育种中值得考虑。

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