烟草不同基因型耐低氮能力差异评价

以单株叶重及其氮素反应指数作为耐低氮能力的评价指标,分析了烟草种质资源的耐低氮能力以及单株叶重及其氮素反应指数与主要农艺性状间的相关关系。结果表明,不同施氮水平下多数农艺性状基因型间差异较大,在低氮水平下表现最大;和其他农艺性状相比,单株叶重在不同氮素水平间平均差异最大。不同施氮水平下,单株叶重均与最大叶叶面积、单株生物量呈显著或极显著正相关;单株叶重的氮素反应指数与单株叶重、生物量呈显著或极显著正相关,且低氮水平下单株叶重的氮素反应指数与上述性状间的相关性比中氮水平下更为密切。在供试的36个烟草品种中,永定400号、金烟6号、红花大金元、G80、Nc82等烟草种质具有较强的耐低氮能力,可以作为氮高效的烟草品种利用。

Evaluation of Low Nitrogen Tolerance for Different Tobacco Varieties

With the leaf weight per plant and nitrogen response index as the evaluating index,the low nitrogen tolerance for tobacco germplasms was evaluated,and the relationship between leaf weight per plant,nitrogen response index and main agronomic traits was analyzed.The results showed that most agronomic traits displayed significant differences among different tobacco genotypes under different N-fertilized levels,and most agronomic traits under low N-fertilized displayed the greatest genotypic differences.The difference of leaf weight per plant under different N-fertilized levels was larger than that of the other agronomic traits.Under different nitrogen applying levels,leaf weight per plant was positively correlated with the maximum leaf area and biomass per plant,response index of nitrogen for leaf weight per plant was positively associated with leaf weight per plant and biomass per plant,and the correlation between response index of nitrogen and leaf weight per plan,biomass per plant under low N-fertilized level were higher than that of moderate N-fertilized level.Among these tobacco varieties tested,Yongding 400,Jinyan 6,Hong-hua-da-jin-yuan,G 80 and Nc 82 had the stronger low nitrogen tolerance ability,which could be used as the tobacco varieties of high nitrogen utilization efficiency.