Effects of Drought on Nutrient Uptake and the Levels of Nutrient-Uptake Proteins in Roots of Drought-Sensitive and -Tolerant Grasses

被引:177
|
作者
Bista, Deepesh R. [1 ]
Heckathorn, Scott A. [1 ]
Jayawardena, Dileepa M. [1 ]
Mishra, Sasmita [2 ]
Boldt, Jennifer K. [3 ]
机构
[1] Univ Toledo, Dept Environm Sci, 2801 W Bancroft St, Toledo, OH 43606 USA
[2] Kean Univ, Dept Biol, Union, NJ 07083 USA
[3] USDA, Toledo, OH 43606 USA
来源
PLANTS-BASEL | 2018年 / 7卷 / 02期
关键词
PERENNIAL C-4 GRASSES; AMMONIUM TRANSPORTER; NITROGEN; STRESS; PHOSPHORUS; PHYSIOLOGY; RESPONSES; GROWTH; LIGHT; HAIRS;
D O I
10.3390/plants7020028
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Climate change will increase drought in many regions of the world. Besides decreasing productivity, drought also decreases the concentration (%) of nitrogen (N) and phosphorous (P) in plants. We investigated if decreases in nutrient status during drought are correlated with decreases in levels of nutrient-uptake proteins in roots, which has not been quantified. Drought-sensitive (Hordeum vulgare, Zea mays) and -tolerant grasses (Andropogon gerardii) were harvested at mid and late drought, when we measured biomass, plant %N and P, root N- and P-uptake rates, and concentrations of major nutrient-uptake proteins in roots (NRT1 for NO3, AMT1 for NH4, and PHT1 for P). Drought reduced %N and P, indicating that it reduced nutrient acquisition more than growth. Decreases in P uptake with drought were correlated with decreases in both concentration and activity of P-uptake proteins, but decreases in N uptake were weakly correlated with levels of N-uptake proteins. Nutrient-uptake proteins per gram root decreased despite increases per gram total protein, because of the larger decreases in total protein per gram. Thus, drought-related decreases in nutrient concentration, especially %P, were likely caused, at least partly, by decreases in the concentration of root nutrient-uptake proteins in both drought-sensitive and -tolerant species.
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页数:16
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