白肋烟杂交种烟碱转化性状的改良

针对中国白肋烟主栽杂交种鄂烟1号烟碱转化株比例和烟碱转化率高的问题,进行了亲本改良并配置出改良杂交种LC-1.研究结果表明,通过对亲本材料(B 21和B 37)的定向选择可以大幅度减少后代群体的转化株比例,降低其烟碱转化率,经过3代选择后,B 21的转化株比例由70.7%降低到0.5%以下;B 37由10.9%降低到0.5%以下.LC-1的总转化株比例为13.7%,显著低于对照鄂烟1号的45.1%,而且所出现的转化株绝大多数为低转化株;混合样品的烟碱转化率为3.25%,比对照的16.31%降低400%,生物碱组成得到了显著优化.

Improvement of the Trait of Nicotine Conversion in Burley Tobacco Hybrid

The study was conducted to investigate the effectiveness of selecting parents of Eyan No.1 for nicotine conversion trait and to compare the effects on reducing convesion in improved hybrids,LC-1,with the original hybrid,which had high proportion of conversion in the population.The results showed that through systemic selections for non-converters in the parent lines,the converters and the nicotine conversion rate in the later population were reduced greatly.Through 3 generation selections,the proportion of converters in the population of B 21 reduced to less than 0.5% from 70.7% in the original population,and for B 37,reduced also to the same level from 10.9%.The proportions of total converters in the improved hybrid was 13.7%,which was 229% lower than the regular hybrid which had the proportion of 45.1%.The nicotine conversion rates of the improved hybrid in the bulk samples were 3.25%,whih was 400% lower than the original population which had nicotine conversion rate of 16.31%.Therefore the alkaloid constitution in the new hybrid was greatly optimized.