| 玉米氮素吸收的基因型差异及其与根系形态的相关性 |
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| 引用本文： | 王艳,米国华,陈范骏,张福锁.玉米氮素吸收的基因型差异及其与根系形态的相关性[J].生态学报,2003,23(2):297-302. |
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| 作者姓名： | 王艳 米国华 陈范骏 张福锁 |
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| 作者单位： | 1. 中国农业大学植物营养系,北京,100094;山西农业大学资源与环境学院,太谷,030801
2. 中国农业大学植物营养系,北京,100094 |
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| 基金项目： | 国家 973重点基础研究规划资助项目 ( G1 9990 1 1 70 7)，国家自然基金“十五”重大资助项目 ( 2 0 0 3-2 0 0 6)~~ |
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| 摘 要： | 采用溶液培养的方法，选用在田间、土培试验中对氮反应有典型差异的玉米自交系：478、H21、Wu312、Zong31、Baici，在4个供N水平（0.04、0.4、2.4mmol/L）下，研究了玉米苗期氮素吸收、分配的基因差异以及与根系形态之间的相关关系，结果表明：在一定的NO3^-浓度范围内（0.04-2mmol/L），根系生物量随N水平的提高而增加，而高N不同程度地降低了5个自交系根系干重。低N下（0.04mmol/L），与其它自交系相比，N高效基因型478具有较大的根系生物量，其根系干重分别为H21、Wu312、Zong31、Baici的1.1、1.74、1.6、1.18倍，并往根系分配了较大比例的N素，根系N累积占总N量的百分率比Wu312、Zong31分别高18.34％、17.08％，而N低效基因型Wu312、Zong31则往地上部分配了较大比例的氮素。随N水平的增加，显著促进了地上部的生长，并在地上部分配了较大比例的N素。当N水平增至4mmol/L时，地上部N素分配的基因型差异减小。低N下，5个自交系根系干重、总根长、根轴总长与总吸N量显著线性相关，而高N下不表现相关关系，说明在N素胁迫的条件下，根系形态对N吸收效率起重要作用。
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| 关 键 词： | 玉米 氮素吸收 基因型差异 根系形态 相关性 |
| 文章编号： | 1000-0933(2003)02-0297-06 |
| 收稿时间： | 2001/10/25 0:00:00 |
| 修稿时间： | 2002/9/12 0:00:00 |
Genotypic differences in nitrogen uptake by maize inbred lines its relation to root morphology |
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| WANG Yan,MI Guohu,CHEN Fanjun and ZHANG Fusuo.Genotypic differences in nitrogen uptake by maize inbred lines its relation to root morphology[J].Acta Ecologica Sinica,2003,23(2):297-302. |
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| Authors: | WANG Yan MI Guohu CHEN Fanjun and ZHANG Fusuo |
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| Affiliation: | .Department of Plant Nutrition in CAU; Beijing; China; |
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| Abstract: | Five maize inbred lines, (478,H21,Wu312, Zong31,Baici), selected from previous field and pot experiments were used in order to compare the genotypic variations in total N uptake, N partition between shoot and root and its relation to root morphology at four nitrate levels (0.04,0.4,2, 4mmol/L). Seedlings were grown in solution cultures. The results showed that 478, a N efficient variety, partitioned a larger amount N to its root in comparison with the other inbred lines. The percentage of root N accumulation to total N accumulation was increased by 18.34% and 17.08%, respectively in comparison with N inefficient lines, Wu312 and Zong31, when it was grown in N-deficient treatment (0.04mmol/L), whereas there was no significant difference between 478, Baici and H21. As the NO- 3 concentration increased, the percentage of total N partitioned to root declined for all the genotypes. Genotypic variation of N partitioning was not detected among the five maize inbred lines at high nitrate supply. ;The highest N accumulation in 478 at low nitrate supply was mainly due to its large root biomass which was 0.10, 0.74, 0.6 and 0.18 times larger than H21, Wu312, Zong31 and Baici respectively. When nitrate concentration increased from 0.04 to 2 mmol/L, root and shoot biomass of all the lines increased to various degrees. At the high nitrate level (4 mmol/L), however, shoot biomass keep increasing whereas root growth was inhibited. The genotypic variation in root dry weight among the five varieties was larger than that of shoot dry weight at low nitrate concentration. Total N uptake was significantly and positively correlated to root dry weight, total root length and length of root axis at 0.04 mmol/L, the coefficients of which were 0.9590, 0.9345 and 0.9050 correspondingly, but not at 4 mmol/L nitrate level. This indicates that genotypes with large root systems are able to obtain more N from low N medium. When N is not a limiting factor for plant growth, root morphology becomes less important in N uptake. |
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| Keywords: | maize genotype nitrate root N uptake |
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