Effect of phosphorus deficiency on growth angle of basal roots in Phaseolus vulgaris
Effect of phosphorus deficiency on growth angle of basal roots in Phaseolus vulgaris
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DOI：
10.1111/j.1469-8137.1996.tb01847.x
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发表时间：
1996-02-01
期刊：
影响因子：
9.4
通讯作者：
Snapp, S
中科院分区：
文献类型：
--
作者：
Bonser, AM;Lynch, J;Snapp, S
根构型可塑性可能是植物吸收磷等固定养分的一个重要因素。在本研究中，我们研究了磷的有效性对菜豆(Phaseolus vallgaris L.)根基向的影响，从而影响了这些根的生长角度。在一组研究中，测量了豆苗基根的生长角随时间的变化。共检测了16个菜豆品种，其中6个品种在低磷条件下根位向随重力降低，1个品种根位向增加，9个品种在基根萌发后5d内基本无差异。在低磷条件下，菜豆主根在重力作用下的根向也变小，生长5d后的生长角度与低磷热带土壤上不同基因型的田间表现相关。P以外的矿物质缺乏不会引起根角的变化。在向根系不同部位提供高磷或低磷溶液的裂袋系统中，低磷条件下根角的减小是对整体磷有效性的响应，而不是对低磷条件下根系部分的局部影响。有效磷对根角的影响与地上部磷浓度的降低有关，但对植物生物量积累和叶面积扩大的影响先于植物生物量积累和叶面积扩大。用三个水平的固相缓冲砂培系统对G-19833基因型生长袋的结果进行了确认。豌豆(Pisum Sativum)、大豆(Glyine Max Williams)、鹰嘴豆(Cier Arietina)、利马豆(Phaseolus Luatus)和小扁豆(Lens Culinaris)在低磷条件下生长，大豆和豌豆的基本根角也降低。
Root architectural plasticity might be an important factor in the acquisition by plants of immobile nutrients such as phosphorus (P). In this study, we examined the effect of P availability on the orientation of basal roots with respect to gravity, and thereby on the growth angle of these roots of common bean (Phaseolus vulgaris L.). In one set of studies the growth angle of basal roots of bean seedlings was measured over time. Sixteen bean genotypes were examined; six showed a decrease in root orientation with respect to gravity in low P media, one increased orientation, and nine showed no difference within 5 d of basal root emergence. Bean taproots also showed decreased root orientation with respect to gravity in low P. Growth angle after 5 d was correlated with field performance of contrasting genotypes in low P tropical soils. Mineral deficiencies other than P did not cause changes in root angle. In a split pouch system that provided high or low P solution to different parts of the root system, the decrease in root angle in low P was found to be a response to global P availability, and not local to the portion of the root system in low P. Effects of P availability on root angle were associated with reduced shoot P concentration, but preceded effects on plant biomass accumulation and leaf area expansion. Results from growth pouches for genotype G 19833 were confirmed using a solid-phase buffered sand-culture system supplying P at three levels. Pea (Pisum sativum), soybean (Glycine max Williams), chickpea (Cicer arietinum), lima bean (Phaseolus lunatus), and lentil (Lens culinaris) were grown with and without P; soybean and pea also showed decreased basal root angles in low P.