Manipulating stomatal density enhances drought tolerance without deleterious effect on nutrient uptake.
Manipulating stomatal density enhances drought tolerance without deleterious effect on nutrient uptake.
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DOI：
10.1111/nph.13598
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发表时间：
2015-10
期刊：
影响因子：
--
通讯作者：
Gray JE
中科院分区：
文献类型：
--
作者：
Hepworth C;Doheny-Adams T;Hunt L;Cameron DD;Gray JE
气孔密度的操纵被调查作为一个潜在的工具，提高耐旱性或养分吸收。耐旱性和土壤持水能力进行了评估拟南芥表皮图案因子突变体操纵气孔密度增加或减少。在不同的植物浇水制度下，使用氮-15（15 N）同位素和质谱法监测通过质量流的根系养分吸收。植物的气孔不足其正常补充的一半，并相应地降低蒸腾水平，保持土壤水分和高度耐旱性，但表现出很少或没有减少，尤其是当水的可用性受到限制的芽氮浓度。相比之下，气孔密度超过正常密度两倍的植物具有更大的氮吸收能力，除非水分供应受到限制。我们证明了生产具有减少的蒸腾作用的植物的可能性，其具有增加的耐旱性，很少或没有营养吸收的损失。我们证明，增加蒸腾作用可以提高养分吸收时，水是丰富的。
Manipulation of stomatal density was investigated as a potential tool for enhancing drought tolerance or nutrient uptake. Drought tolerance and soil water retention were assessed using Arabidopsis epidermal patterning factor mutants manipulated to have increased or decreased stomatal density. Root nutrient uptake via mass flow was monitored under differing plant watering regimes using nitrogen‐15 (15N) isotope and mass spectrometry. Plants with less than half of their normal complement of stomata, and correspondingly reduced levels of transpiration, conserve soil moisture and are highly drought tolerant but show little or no reduction in shoot nitrogen concentrations especially when water availability is restricted. By contrast, plants with over twice the normal density of stomata have a greater capacity for nitrogen uptake, except when water availability is restricted. We demonstrate the possibility of producing plants with reduced transpiration which have increased drought tolerance, with little or no loss of nutrient uptake. We demonstrate that increasing transpiration can enhance nutrient uptake when water is plentiful.