摘要
选用对N反应有典型差异的玉米自交系“478”、“CA170”研究其根系生长和形态对N水平反应的动态变化结果表明,随培养时间的延长,玉米地上部生物量随N水平的提高而增加,且2个N水平下“478”均高于“CA170”。低N水平下“478”根系生物量显著大于“CA170”,高N水平下二者根系干物质量的基因型差异减小。低N有利于根系纵向伸长,表现为总根长、平均根长显著增加,且“478”总根长、平均根长及侧根密度均大于“CA170”,但生长初期(7d)时这种基因型变化差异并不显著。高N有利于根系横向伸展,表现为1级侧根密度的增加,而平均根长缩短,2个基因型平均根长无显著差异。在N素胁迫下“478”较大的根系优势有利于其高效吸收N素。
Dynamic changes of root morphology affected by nitrate levels in different maize inbred lines (' 478'、 'CA170') are studied in this paper. The results show that increasing the nitrate application level can enhance the shoot biomass as the planting time passes, whereas '478' is higher than 'CA170' at two nitrate concentrations. Compared with 'CA170', the variety of '478' has a longer total root length, average root length and density of laterals to obtain more nitrogen at N deficiency, but this tendency is not so significant at the very beginning of the sampling time (7d). At high nitrate supply, the density of laterals increases for the two varieties, root average length however, becomes short, and the genotypic difference of the two varieties does not exist. Therefore, A larger root system of '478' is useful to extract much more N especially at low N condition.
出处
《中国生态农业学报》
CAS
CSCD
2003年第3期69-71,共3页
Chinese Journal of Eco-Agriculture
基金
国家自然科学基金(39770438)和山西省归国留学人员项目(98061)共同资助
