《植物生理学报》 2010, 46(1): 51-54

磷有效性对大豆根冠中碳分配的影响

赵静, 刘嘉儿, 严小龙 , 廖红*

华南农业大学根系生物学研究中心, 广州 510642

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

Effects of Phosphorus Availability on Carbon Allocation between Shoots and Roots in Soybean

ZHAO Jing, LIU Jia-Er, YAN Xiao-Long , LIAO Hong*

Root Biology Center, South China Agricultural University, Guangzhou 510642, China

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