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首页> 外文期刊>African Journal of Biotechnology >High/low nitrogen adapted hybrid of rice cultivars and their physiological responses
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High/low nitrogen adapted hybrid of rice cultivars and their physiological responses

机译：水稻品种的高/低氮适应性杂种及其生理响应

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Seventy?(70)?selective bred hybrid?of?rice combinations were treated with three levels of pure nitrogen (N1/2,?20.0mg/l; N1,?40.0mg/l; N2,?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 N1/2?and N2?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 N2?and N1/2conditions 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.
机译：用三种水平的纯氮（N1 / 2，≤20.0mg/ l; N1，≤40.0mg/ l; N2，≤80.0mg/ l）处理七十（70）个杂交品种的水稻组合。两周以确定氮的适应性。它们被分为花型的六种类型：一类在不同氮浓度下具有良好的适应性，在N1 / 2和N2处理下它们的根和茎比（R / S比）显着增加。但是6型对那些环境敏感，在相应的治疗下R / S比明显降低。其他四种类型位于中间，具有适度的氮适应性。此外，从上述六种类型中分别选择了五个品种，然后在无氮条件下生长，以研究它们在缺乏氮的情况下的性能。结果表明，第一种类型的材料的干重最初是在N2中生长的，而N1 / 2条件均降低，对无氮条件的适应性最低;在第3类中，生长相似条件的材料都增加了，对无氮条件具有更好的适应性。从总体上讲，具有良好氮适应性的水稻材料是由于在低氮条件下较高的硝酸还原酶活性（NRA），在高氮条件下具有更多的叶绿素含量和可溶性蛋白质，以及在无氮条件下也可移动的Rubisco。 。

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