Stomatal NH3 compensation point and its metabolic regulation in senescence phenotypes of Nicotiana tabacum
2012
Duan, W.J., Henan Agricultural Univ., Zhengzhou (China) | Yang, T.Z., Henan Agricultural Univ., Zhengzhou (China) | Dai, Y., China Tobacco Chuanyu Industrial Corporation, Chengdu (China). Research and Development Center | Li, D.L., China Tobacco Chuanyu Industrial Corporation, Chengdu (China). Research and Development Center | Zhang, X.Q., Henan Agricultural Univ., Zhengzhou (China) | Liu, H.B., Henan Agricultural Univ., Zhengzhou (China) | Li, N., China Tobacco Chuanyu Industrial Corporation, Chengdu (China). Research and Development Center | Wang, C.G., China Tobacco Chuanyu Industrial Corporation, Chengdu (China). Research and Development Center
We compared stomatal ammonia compensation point (Xs) and its metabolic regulation in Nicotiana tabacum leaves of a quick-leaf-senescence phenotype ZY90 and a slow-leaf-senescence phenotype NC89. Compared with NC89, ZY90 had significantly higher Xs values between 40 and 60 d after leaf sprouting in spite of its lower nitrogen content. During the same time, a steeper decline in glutamine synthetase activity was detected in ZY90 leaves, simultaneously with a steep increase in Xs. These results suggested that the quick leaf senescence phenotype exhibited high NH3 emission potential due to efficient nitrogen recycling and remobilization. Glutamine synthetase played a key role in regulating Xs in ZY90.
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