| 不同氮效率水稻品种增硝营养下根系生长的响应特征 |
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| 引用本文： | 王东升,张亚丽,陈石,段英华,沈其荣.不同氮效率水稻品种增硝营养下根系生长的响应特征[J].植物营养与肥料学报,2007,13(4):585-590. |
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| 作者姓名： | 王东升 张亚丽 陈石 段英华 沈其荣 |
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| 作者单位： | 1.南京农业大学资源与环境科学学院 江苏南京210095 |
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| 摘 要： | 试验采用两室分根盒和溶液培养方法,研究了在增硝营养下不同氮效率水稻品种根系生长的响应特征。结果表明,在本试验条件下,与全铵培养下的根系相比,氮高效水稻品种南光在铵硝混合培养下的根系干重和氮积累量显著增加,增幅达33%和41%;同时其根系表面积、根系体积和侧根数增幅均达到显著水平,但根系长度却无明显增加。氮低效水稻品种Elio在铵硝混合培养下的根系生长差异均不显著。这表明氮高效水稻品种南光的根系生长对增硝营养的响应度强,进而促进了根系对氮素的吸收利用。从本试验的结果可推论,水稻对增硝营养的强响应度可能是水稻氮素高效吸收利用的生理机制之一。
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| 关 键 词： | 水稻 硝态氮(NO3-) 氮效率 根系生长 |
| 文章编号： | 1008-505X（2007）04-0585-06 |
| 收稿时间： | 2006-03-22 |
| 修稿时间： | 2006-03-222006-08-18 |
Response of root growth of rice genotypes with different N use efficiency to enhanced nitrate nutrition |
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| WANG Dong-sheng,ZHANG Ya-li,CHEN Shi,DUAN Ying-hua,SHEN Qi-rong.Response of root growth of rice genotypes with different N use efficiency to enhanced nitrate nutrition[J].Plant Nutrition and Fertilizer Science,2007,13(4):585-590. |
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| Authors: | WANG Dong-sheng ZHANG Ya-li CHEN Shi DUAN Ying-hua SHEN Qi-rong |
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| Institution: | 1.College of Resource and Environment Science;Nanjing Agricultural University;Nanjing 210095;China |
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| Abstract: | Rice roots can excrete O2 to surrounding soil and this can convert ammonium(NH 4) to nitrate(NO-3) in the process of nitrification at root surface or in rhizosphere and rice roots are actually always exposed to a mixture of NH 4 and NO-3,although the predominant species of mineral nitrogen(N) in the soil collected from the lowland rice field is NH 4.Therefore,NO-3 nutrition on the surface of rice roots is an important part of N nutrition of rice plants.Two experiments,including whole plant root culture and root-split culture in NH 4 and NH 4/NO-3(75/25) solutions,were conducted to study the effect of enhanced NO-3 nutrition on root growth of rice cultivars with different N use efficiency(NUE) during whole growth stage.Two rice cultivars,namely Nanguang(a high NUE rice cultivar) and Elio(a low NUE rice cultivar) selected from 2003 and 2004 field experiments were used in the two experiments.Whole plant root culture indicated that differences existed in the root biomass accumulation between the two rice cultivars when rice roots were exposed to a mixture of NH 4 and NO-3.Compared to NH 4 solution,enhanced NO-3 nutrition increased root biomass accumulation of Nanguang during different growth stages while no difference occurred in Elio.Root-split culture showed that the growth of rice roots was stimulated by localized NO-3 supply.For example,localized NO-3 nutrition increased root biomass accumulation and N accumulation of localized roots in Nanguang cultivar by about 33% and 41%.Moreover,the number of laberal root,surface area and volume of localized roots were also significantly increased in Nanguang cultivar.It is concluded that high N use efficiency rice cultivar was more responsive to NO-3 nutrition than low NUE cultivar,implying that enhanced growth of rice roots by NO3 may be one of physiological mechanisms of high nitrogen use efficiency in rice plants. |
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| Keywords: | rice nitrate(NO-3) N use efficiency root growth |
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