What are the implications of variation in root hair length on tolerance to phosphorus deficiency in combination with water stress in barley (Hordeum vulgare)?

被引:159
作者
Brown, L. K.
George, T. S. [1 ]
Thompson, J. A.
Wright, G.
Lyon, J.
Dupuy, L.
Hubbard, S. F. [1 ]
White, P. J.
机构
[1] Univ Dundee, JHI, Div Plant Sci, Dundee DD2 5DA, Scotland
关键词
barley mutants; P-use efficiency; drought; rhizosheath; agricultural sustainability; root hairs; combined stress; ARABIDOPSIS-THALIANA; PHOSPHATE STARVATION; GROWTH; ACQUISITION; EXPRESSION; MUTANT;
D O I
10.1093/aob/mcs085
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Phosphorus commonly limits crop yield and is frequently applied as fertilizer; however, supplies of quality rock phosphate for fertilizer production are diminishing. Plants have evolved many mechanisms to increase their P-fertilizer use efficiency, and an understanding of these traits could result in improved long-term sustainability of agriculture. Here a mutant population is utilized to assess the impact of root hair length on P acquisition and yield under P-deficient conditions alone or when combined with drought. Mutants with various root hair phenotypes were grown in the glasshouse in pots filled with soil representing sufficient and deficient P treatments and, in one experiment, a range of water availability was also imposed. Plants were variously harvested at 7 d, 8 weeks and 14 weeks, and variables including root hair length, rhizosheath weight, biomass, P accumulation and yield were measured. The results confirmed the robustness of the root hair phenotypes in soils and their relationship to rhizosheath production. The data demonstrated that root hair length is important for shoot P accumulation and biomass, while only the presence of root hairs is critical for yield. Root hair presence was also critical for tolerance to extreme combined P deficit and drought stress, with genotypes with no root hairs suffering extreme growth retardation in comparison with those with root hairs. The results suggest that although root hair length is not important for maintaining yield, the presence of root hairs is implicit to sustainable yield of barley under P-deficient conditions and when combined with extreme drought. Root hairs are a trait that should be maintained in future germplasm.
引用
收藏
页码:319 / 328
页数:10
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