Response-based selection of barley cultivars and legume species for complementarity: Root morphology and exudation in relation to nutrient source
Response-based selection of barley cultivars and legume species for complementarity: Root morphology and exudation in relation to nutrient source
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DOI：
10.1016/j.plantsci.2016.11.002
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发表时间：
2017-02-01
期刊：
影响因子：
5.2
通讯作者：
George, Timothy S.
中科院分区：
文献类型：
--
作者：
Giles, Courtney D.;Brown, Lawrie K.;George, Timothy S.
通过增加农业生态系统的生物多样性，可以提高磷(P)和氮(N)的利用效率。植物对养分缺乏反应的表型差异可能影响间作系统的正互补性。采用多组分筛选方法，研究了磷源和氮源对L大麦和豆科牧草营养取食性状表型可塑性的影响。测定了6种植物养分处理的根系形态和分泌物。大麦和豆科作物对营养处理的反应有明显的差异。豆科植物的根系形态差异最大，而大麦的渗出物柠檬酸和植酸酶活性差异最大。与硝酸盐相比，施铵的植株根系形态变化最小，但缺磷时根系形态的变化加剧。不同豆科植物的分泌物植酸酶活性和pH值不同，而柠檬酸流出量、比根长和根径长度在大麦品种间差异较大。3个豆科植物和4个大麦品种被鉴定为对缺磷最敏感，并且在供试品种和物种中反差最大。对养分有效性的表型反应可能是选择最小投入种植制度的植物组合的一种很有前途的方法。(C)2016爱思唯尔爱尔兰有限公司。保留所有权利。
Phosphorus (P) and nitrogen (N) use efficiency may be improved through increased biodiversity in agroecosystems. Phenotypic variation in plants' response to nutrient deficiency may influence positive complementarity in intercropping systems. A multicomponent screening approach was used to assess the influence of P supply and N source on the phenotypic plasticity of nutrient foraging traits in barley (H. vulgare L) and legume species. Root morphology and exudation were determined in six plant nutrient treatments. A clear divergence in the response of barley and legumes to the nutrient treatments was observed. Root morphology varied most among legumes, whereas exudate citrate and phytase activity were most variable in barley. Changes in root morphology were minimized in plants provided with ammonium in comparison to nitrate but increased under P deficiency. Exudate phytase activity and pH varied with legume species, whereas citrate efflux, specific root length, and root diameter lengths were more variable among barley cultivars. Three legume species and four barley cultivars were identified as the most responsive to P deficiency and the most contrasting of the cultivars and species tested. Phenotypic response to nutrient availability may be a promising approach for the selection of plant combinations for minimal input cropping systems. (C) 2016 Elsevier Ireland Ltd. All rights reserved.