Lack of evidence for programmed root senescence in common bean (Phaseolus vulgaris) grown at different levels of phosphorus supply
Lack of evidence for programmed root senescence in common bean (Phaseolus vulgaris) grown at different levels of phosphorus supply
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DOI：
10.1046/j.0028-646x.2001.00285.x
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发表时间：
2002-01-01
期刊：
影响因子：
9.4
通讯作者：
Lynch, JP
中科院分区：
文献类型：
--
作者：
Fisher, MCT;Eissenstat, DM;Lynch, JP
本文报道了磷 (P) 有效性对菜豆（Phaseolus vulgaris cv. Carioca）根系寿命的影响，以及与营养和生殖发育相关的根存活模式。植物在温室中的沙培系统中生长，具有不同的磷有效性： ，以及具有更高生物活性的高磷田间土壤。使用 minirhizotron 系统评估根动态。磷限制使植物生长减少 90%，但并没有降低根存活率。在非限制性和限制性 P 下，根的存活与芽的发育和衰老并不密切同步；大部分根部仍然存在，甚至在生殖成熟之后似乎还活着。在田间种植的豆类和沙养中磷严重限制的豆类中，存活率下降了约 10%。 50%，但仅在荚果填充几乎完成后。普通豆在荚果填充期间和之后立即不会表现出程序性根衰老。根部在芽经历其他衰老过程（例如落叶和荚果干燥）后死亡。在田间条件下，土壤生物可能会调节磷缺乏和荚果填充对根系死亡的影响。
The influence of phosphorus (P) availability on root lifespan in common bean (Phaseolus vulgaris cv. Carioca) is reported here, as well:as patterns of root survivorship in relation to vegetative and reproductive development.Plants were grown in a glasshouse in a sand-culture system with varying P availability: , and in a high-P field soil with greater biotic activity. Root dynamics were assessed using a minirhizotron system.Phosphorus limitation, which reduced plant growth by 90%, did not diminish root survivorship. At nonlimiting and limiting P, root survivorship was not synchronized closely with shoot development and senescence; a substantial portion of the roots were present and seemingly alive even beyond reproductive maturity. In field-grown beans and in beans under severe P limitation in sand culture, survivorship fell approx. 50%, but only after pod fill was nearly complete.Common bean does not exhibit programmed root senescence during and immediately following pod fill. Roots died after the shoot had undergone other senescence processes, such as leaf drop and pod dry-down. Under field conditions, soil organisms are likely to modulate the effects of phosphorus deficiency and pod fill on root death.