《植物生理学报》 2010, 46(1): 51-54
通信作者:廖红;E-mail: hliao@scau.edu.cn;Tel: 020-85283380
摘 要:
在水培条件下, 研究不同浓度磷影响大豆根冠中碳分配的结果表明: 磷有效性对大豆根冠中碳分配的影响依赖于磷 浓度与胁迫时间。磷浓度高于 0.125 mmol•L-1 或低磷胁迫 7 d 以内, 大豆根冠中碳分配受到的影响不显著。低磷胁迫 14 d 的大豆的净光合速率和根呼吸速率均显著下降, 根冠比显著提高。这显示长期低磷胁迫下大豆碳同化总量和根呼吸消耗的 碳量虽然减少, 但根系生长的碳消耗则增加, 光合碳同化形成的碳水化合物向根部的分配是受到促进的。关键词:磷有效性; 碳分配; 大豆
收稿:2009-10-30 修定:2009-11-19
资助:教育部新世纪人才基金
Corresponding author: LIAO Hong; E-mail: hliao@scau.edu.cn; Tel: 020-85283380
Abstract:
Effects of phosphorus (P) availability on carbon (C) allocation between shoots and roots in soybean were studied in hydroponics. The results showed that the effects of P availability on C allocation between shoots and roots in soybean mainly depended on P concentration and duration of P deficiency. P concentration higher than 0.125 mmol·L-1 or duration of P deficiency shorter than 7 days could not affect the C allocation between shoots and roots. But the net photosynthetic rate, root respiration rate of soybean decreased 14 days after P stress and resulted in increased root/shoot ratio. Therefore, long-term P deficiency could reduce the total amount of C assimilation and C cost on root respiration, but increase the C cost on root growth so as to facilitate the C allocation to roots from photosynthetic C source.Key words: phosphorus availability; carbon allocation; soybean
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