摘要
为明确不同烤烟品种成熟期的衰老特性差异与其氨气补偿点的关系,采用盆栽试验测定了3个烤烟品种(中烟90、K326和NC89)的叶片质外体NH4+浓度和pH,并计算不同品种烤烟的氨气补偿点(25℃)。结果表明,成熟期3个烤烟品种叶片质外体NH4+浓度均呈上升趋势,衰老速度快的品种,其叶片氮素含量低,谷氨酰胺合成酶活性小,氨气补偿点绝对值高、上升幅度大。因此,烤烟成熟期衰老速度快的品种具有较大的氨挥发潜力,烤烟衰老特性的品种间差异与其氨气补偿点的差异有关。
To better understand the relationship of senescence characteristic difference between different flue-cured tobacco varieties at maturity stage with NH3 compensation points, pot experiments on three varieties （ZY90, K326 and NC89） were carried out, foliar apoplastic NH4＋ concentration and pH were determined, and their NH3 compensation points （ks, 25℃） were calculated. The results showed that an increase trend was observed in the apoplastic NH4＋ concentration in all the three varieties at maturity stage; comparing with slow senescing cultivar, the leaves of fast senescing tobacco cultivar possessed lower N content, lower glutamine synthetase activity, higher absolute value of NH3 compensation point （Xs, 25 ℃） and larger increasing extent.Therefore, the fast senescing tobacco cultivar featured a higher potential of NH3 emission from senescing leaves at maturity stage, and the difference of senescence characteristics between varieties related to their difference of NH3 compensation points.
出处
《烟草科技》
EI
CAS
北大核心
2013年第6期69-73,共5页
Tobacco Science & Technology
基金
国家烟草专卖局项目"烤烟浓香型特色新品种选育及示范"(hykj200817)
关键词
烤烟
成熟期
氨气补偿点
衰老特性
Flue-cured tobacco
Maturity stage
NH3 compensation point
Senescence characteristic
