Biochemical, Physiological and Transcriptomic Comparison between Burley and Flue-Cured Tobacco Seedlings in Relation to Carbohydrates and Nitrate Content

Molecules

卷:22

Dong Chang¹  Jingjing Li¹  Yuqing Feng²  Huijuan Yang²  Shuzhen Lin³  Yafei Li³  Hongzhi Shi³ 

[1] Biochemistry Research Center, Henan Agricultural University, Zhengzhou 450002, China;

[2] Physiology &

[3] National Tobacco Cultivation &

关键词: burley tobacco;    chlorophyll;    carbohydrate;    nitrogen assimilation;    nitrate;   

DOI  :  10.3390/molecules22122126

来源: DOAJ

【 摘 要 】

Burley tobacco is a genotype of chloroplast-deficient mutant with accumulates high levels of tobacco-specific nitrosamines (TSNAs) which would induce malignant tumors in animals. Nitrate is a principle precursor of tobacco-specific nitrosamines. Nitrate content in burley tobacco was significantly higher than that in flue-cured tobacco. The present study investigated differences between the two tobacco types to explore the mechanisms of nitrate accumulation in burley tobacco. transcripts (3079) related to the nitrogen and carbon metabolism were observed. Expression of genes involved in carbon fixation, glucose and starch biosynthesis, nitrate translocation and assimilation were significantly low in burley tobacco than flue-cured tobacco. Being relative to flue-cured tobacco, burley tobacco was significantly lower at total nitrogen and carbohydrate content, nitrate reductase and glutamine synthetase activities, chlorophyll content and photosynthetic rate (Pn), but higher nitrate content. Burley tobacco required six-fold more nitrogen fertilizers than flue-cured tobacco, but both tobaccos had a similar leaf biomass. Reduced chlorophyll content and photosynthetic rate (Pn) might result in low carbohydrate formation, and low capacity of nitrogen assimilation and translocation might lead to nitrate accumulation in burley tobacco.

【 授权许可】

Unknown