摘要
以12个小麦基因型为研究对象,采用溶液培养与田间试验的方法,设低氮胁迫和正常供氮2个水平,对耐低氮小麦基因型的筛选指标进行了探讨,为氮高效基因型小麦育种提供理论依据。结果表明,小麦植株干重在低氮胁迫和正常供氮条件下都有较大的基因型变异(变异系数CV分别为29.03%和18.21%);在所有调查性状的相对值中,相对植株干重(低氮胁迫/正常供氮)基因型变异较大(CV为22.76%)。相关性分析表明,相对植株干重与相对株高、相对植株吸氮量和相对氮利用效率间呈极显著正相关(P<0.01),且溶液培养试验中相对植株干重和田间试验中相对子粒产量(不施氮/施氮)间呈极显著正相关(r=0.77**,n=12)。因此,以小麦苗期相对植株干重作为筛选指标,然后进行田间验证,是筛选耐低氮小麦基因型行之有效的途径。
Screening and breeding low nitrogen （N） tolerant wheat genotype is one of the effective alternatives to alleviate pollution of environment, and increase the utilization efficiency of N fertilizer. A simple and scientific screening index plays an important role in the screening and breeding program. In this study, a hydroponic experiment and a field trial were carded out to screen the index for low N tolerant wheat genotypes under N stress and normal N supply condition, respectively. Results showed that total dry weight showed a significant genotypic variation at both normal and low N supply （the CV was 18.21% and 29.03 %, respectively）. Relative dry weight （low N supply/normal N supply） also showed a significant genotypic variation （CV was 22.73 % ）. Correlation analysis showed that relative dry weight was highly significantly correlated to relative plant height, relative total N uptake, and relative N utilization efficiency （P 〈 0.01 ）. The relative total dry weight of wheat in solution culture system was significantly correlated to the relative grain yield （minus - N/plus- N） in field trial（r= 0.77^＊＊ ,n = 12）. Therefore, relative total dry weight at seedling stage would probably be an effective screening indexfor screening wheat genotype which tolerant to low N.
出处
《植物营养与肥料学报》
CAS
CSCD
北大核心
2007年第1期93-98,共6页
Journal of Plant Nutrition and Fertilizers
基金
山西省科技厅攻关项目(031008)
山西省农科院青年基金(YQN0303)资助
关键词
小麦基因型
耐低氮
筛选指标
评价指标
winter wheat
low N tolerance
genotype
screening index
evaluation index
