文献类型: 外文期刊
作者: Li Xia 1 ; Sun Zhiwei 1 ; Jin Lei 1 ; Han Lei 1 ; Ren Chenggang 1 ; Wang Man 1 ; Lu Chuangen 1 ;
作者机构: 1.Jiangsu Acad Agr Sci, Inst Food Crops, Jiangsu High Qual Rice R&D Ctr, Nanjing 210014, Jiangsu Prov, Peoples R China
关键词: Rice;ratio of root and stem;SPAD;nitrogen;adaptation
期刊名称:AFRICAN JOURNAL OF BIOTECHNOLOGY ( 影响因子:0.573; 五年影响因子:0.794 )
ISSN: 1684-5315
年卷期: 2011 年 10 卷 19 期
页码:
收录情况: SCI
摘要: Seventy (70) selective bred hybrid of rice combinations were treated with three levels of pure nitrogen (N(1/2), 20.0mg/l; N(1), 40.0mg/l; N(2), 80.0mg/l) for two weeks for indentifying the adaptation of nitrogen. They were divided into six types with the cluster analysis as flowers: Type 1 with good adaptability of different concentrations of nitrogen, their ratio of root and stem (R/S ratio) was significantly increased under N(1/2) and N(2) treatment; but type 6 with sensitivity to those environments, the R/S ratio was significantly decreased under corresponding treatments. Other four types were lying in the middle with moderate adaptability of nitrogen. Furthermore, five varieties were selected from each of the mentioned six types and then grew in N-free conditions to investigate their performance on lack of N. The results showed that type 1, the dry weight of the materials originally growing in N(2) and N(1/2) conditions were both decreased, which had the lowest adaptability to N-free conditions; type 3, those of the materials growing similar conditions were both increased, which had better adaptability to N-free conditions. On the whole physiologically, the rice materials with good adaption of N were due to higher nitrate reductase activity (NRA) at low nitrogen conditions, more chlorophyll content and soluble protein in high nitrogen conditions, and the Rubisco mobilized in N-free conditions as well.
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