| 不同磷营养油菜品种根系形态及生理特性差异研究 |
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| 引用本文： | 刘慧,刘景福,刘武定.不同磷营养油菜品种根系形态及生理特性差异研究[J].植物营养与肥料学报,1999,5(1):40-45. |
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| 作者姓名： | 刘慧 刘景福 刘武定 |
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| 作者单位： | 1.华中农业大学资源环境与农业化学系,武汉 430070 |
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| 基金项目： | 农业部95-农-17-04-01课题资助 |
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| 摘 要： | 研究不同磷营养油菜对磷素的反应及其根系形态特征、生理特性等方面的差异，结果表明:磷高效油菜需磷量较小，而在缺磷时吸磷量较大；缺磷时两种油菜品种根冠比增加，且磷高效品种增加幅度大于磷低效品种；缺磷时，磷高效品种具有较长的根系，较大的根体积、根表面积与根活跃吸收表面积，而加磷时，两品种差异不大。油菜缺磷时，磷高效品种磷外渗率小于磷低效品种，加磷时两品种磷外渗率差异不大。缺磷时磷高效品种对磷的亲和力大于磷低效品种，加磷时磷高效品种中磷进入根系的最大净流量小于磷低效品种。
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| 关 键 词： | 油菜 磷吸收效率 品种差异 根系形态 生理特性 |
| 修稿时间： | 1997年9月1日 |
DIFFERENCES OF ROOT MORPHOLOGY ANDPHYSIOLOGICAL CHARACTERISTICS BETWEEN TWO RAPE GENOTYPES WITH DEFFERENT P-EFFICIENCY |
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| Liu Hui Liu Jingfu Liu Wuding.DIFFERENCES OF ROOT MORPHOLOGY ANDPHYSIOLOGICAL CHARACTERISTICS BETWEEN TWO RAPE GENOTYPES WITH DEFFERENT P-EFFICIENCY[J].Plant Nutrition and Fertilizer Science,1999,5(1):40-45. |
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| Authors: | Liu Hui Liu Jingfu Liu Wuding |
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| Affiliation: | 1.Huazhong Agri Univ;Wuhan 430070 |
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| Abstract: | The two rape ( Brassica napus L) genotype with different P-efficiency (HB:higer P-efficiency, SH:lower P-efficiency) were selected from 32 rape cultivas Further studies were carried out to the ability of P absorption; the root morphology such as root/shoot ratio, root length, root volume, root surface area and active absorb surface area; the physiological characteristic such as root membrane permeability, P-efflux rate and kinetic parameters between two rape genotype under P-deficiency and P-adequate conditions The results showed that HB can take in more P from soil than SH The reason was that when P was deficient, HB maintained higher ratio of root to shoot, bigger root system, larger root surface area, higher root activity, stronger affinity to P, so it's uptake efficiency was higher; meanwhile, its root cell membrane permeability and P efflux rate decreased, so the net uptake rate was higher Under the P adequate conditions there was very little difference between two genotype of rape in ability to P absorption |
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