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Plasticity of wheat seedling responses to K^(+) deficiency highlighted by integrated phenotyping of roots and root hairs over the whole root system

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Stress Biology 2023年第1期3卷 69-83页

作者： Ikram Madani Jean-Benoit Peltier martin boeglin Hervé Sentenac Anne-Aliénor Véry Institut des Sciences des Plantes de Montpellier UMR 5004 CNRS-386 INRAE-Université Montpellier-Institut AgroCampus SupAgro-INRAE Bat 7Place VialaMontpellier 34060 Cedex 2France

The availability in the soil of potassium(K^(+)),a poorly mobile macronutrient required in large quantities for plant growth,is generally suboptimal for crop production in the absence of fertilization,making improvement of the ability of crops to adapt to K^(+)deficiency stress a major *** the uptake capacity of the root system is among the main strategies to achieve this ***,we report an integrative approach to examine the effect of K^(+)deficiency on the development of young plant entire root system,including root hairs which are known to provide a significant contribution to the uptake of poorly mobile nutrients such as K^(+),in two genetically distant wheat varieties.A rhizobox-type methodology was developed to obtain highly-resolved images of root and root hairs,allowing to describe global root and root hair traits over the whole root system via image analysis *** two wheat varieties responded differently to the K^(+)shortage:Escandia,a wheat ancestor,reduced shoot biomass in condition of K^(+)shortage and substantially increased the surface area of its root system,specifically by increasing the total root hair *** Zenati,a landrace,conversely appeared unresponsive to the K^(+)shortage but was shown to constitutively express,independently of the external K^(+)availability,favorable traits to cope with reduced K^(+)availability,among which a high total root hair ***,valuable information on root system adaptation to K^(+)deficiency was provided by global analyses including root hairs,which should also be relevant for other nutrient stresses.

关键词： K^(+)deficiency Root hair Root system Phenotyping Wheat Rhizobox Root plasticity

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