Phosphorus stress induced variations in growth behavior and P-efficiency among Brassica cultivars grown with sparingly soluble P-sources.
Phosphorus stress induced variations in growth behavior and P-efficiency among Brassica cultivars grown with sparingly soluble P-sources.
复制标题
磷胁迫导致使用微溶性磷源生长的芸苔属品种的生长行为和磷效率发生变化。
DOI：
10.1080/00103624.2014.919310
复制
发表时间：
2014
影响因子：
1.8
通讯作者：
C.
中科院分区：
文献类型：
--
作者：
Akhtar;M. S.;Oki;Y.;Nishigaki;M.;Adachi;T.;Nakashima;Y.;Nakamoto;Y. and Hartwig;C.
为了评估磷胁迫诱导的相对生长响应、磷效率特征、磷再动员和根结构系统的再设计，在溶液和砂培试验中，油菜品种在低溶性磷酸钙和磷酸钙[Ca3(PO4)2]环境下生长，或在低/高磷环境下生长。被试品种在生物量积累、磷浓度和含量、磷胁迫因子（PSF）和磷效率特性[磷利用效率（PUE）、磷效率（PE）和磷效率比（PER）]方面表现出相当大的遗传多样性。磷效率与生长参数之间存在显著的统计学相关性。缺磷处理下，主根伸长率降低，侧根长度和分枝区伸长率增加。品种将磷从代谢不活跃的部位重新激活到磷胁迫植物的活性部位，这可能有助于低耐磷品种建立更好的生根系统，这为提高磷利用效率和抗磷胁迫能力提供了基础。高磷效率和低PSF值的品种对磷的耐受性更强，是磷胁迫环境下生长的较好选择。
To evaluate phosphorus (P)–stress–induced relative growth responses, P-efficiency characteristics, P remobilization, and redesign in root architectural systems,Brassicacultivars were grown with sparingly soluble rock phosphate and calcium phosphate [Ca3(PO4)2] or with low/high P supply in solution and sand culture experiments. Tested cultivars showed considerable genetic diversity in biomass accumulation, concentration and contents of P, P-stress factor (PSF), and P-efficiency characteristics [P-utilization efficiency (PUE), P efficiency (PE), and P-efficiency ratio (PER)]. Statistically significant correlations were observed between P efficiency and growth parameters. Elongation rates of primary roots decreased but the length of lateral roots and branched zone elongation rates increased under P starvation. Cultivars remobilized P from metabolically inactive to active sites in P-stressed plants that may have helped low-P-tolerant cultivars to establish a better rooting system, which provided basis for enhanced P-use efficiency and tolerance against P stress. Cultivars depicting high P efficiency and low PSF values were more tolerant and are a better choice to grow under P-stress environments.