氮素形态对甜菜抗氮胁迫能力的效应研究

Studies on effect of N applying form on sugarbeet resistance to N stress

试验采用土培和液培相结合的方法，对不同基因型甜菜的抗氮胁迫能力进行了研究，结果表明：1）甜菜对氮胁迫具有多样性，不同基因型甜菜的抗氮胁迫能力具有较大差异（为2～6倍）；2）甜菜的抗氮胁迫能力受外界供给氮素的形态影响较大，参试的6个品种（系）中，对NH4－N胁迫抗性强的，对NH4－N加NO3－N混合营养液胁迫的抗性也强；3）氮素的供给形态左右甜菜的吸收氮特性，但不同基因型的甜菜对3种氮源的反应不一；4）甜菜的抗氮胁迫指数与叶面积、叶绿素含量和全氮量呈显著正相关。

By the using of soil pot and liquid culture the resistance to N stress in different sugarbeet genotypes was studied and the results showed that 1 sugarbeet has a versatile reactions to N stress the difference of resistance to N stress ranged from 2～6 times 2 N applying form had a great effect on sugarbeet resistance to N stress for the 6 varieties lines which were used in this study that had a higher resistance to NH4-N stressalso showed a higher resistance to NO3-N＋NH4-N mixed nutrient 3 N applying form regulated N uptake character in sugarbeetbut the reactions of different genotypes showed alarge difference to NO3-NNH4-N and NO3-N＋ NH4-N stress 4 The index of sugarbeet resistance to N stress had a significant positive correlation with leaf areachlorophyll and total N content．