Brief Communication

Biologia Plantarum

, Volume 56, Issue 4, pp 771-774

Stomatal NH3 compensation point and its metabolic regulation in senescence phenotypes of Nicotiana tabacum

  • W. J. DuanAffiliated withHenan Agricultural UniversityResearch and Development Center, China Tobacco Chuanyu Industrial Corporation
  • , T. Z. YangAffiliated withHenan Agricultural University Email author 
  • , Y. DaiAffiliated withResearch and Development Center, China Tobacco Chuanyu Industrial Corporation
  • , D. L. LiAffiliated withResearch and Development Center, China Tobacco Chuanyu Industrial Corporation
  • , X. Q. ZhangAffiliated withHenan Agricultural University
  • , H. B. LiuAffiliated withHenan Agricultural University
  • , N. LiAffiliated withResearch and Development Center, China Tobacco Chuanyu Industrial Corporation
  • , C. G. WangAffiliated withResearch and Development Center, China Tobacco Chuanyu Industrial Corporation

Rent the article at a discount

Rent now

* Final gross prices may vary according to local VAT.

Get Access

Abstract

We compared stomatal ammonia compensation point (χs) and its metabolic regulation in tobacco (Nicotiana tabacum) leaves of a quick-leaf-senescence phenotype ZY90 and a slow-leaf-senescence phenotype NC89. Compared with NC89, ZY90 had significantly higher χs 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 χs. These results suggested that the quick leaf senescence phenotype exhibited high NH3 emission potential due to efficient nitrogen recycling and remobilization, and glutamine synthetase played a key role in regulating χs in ZY90.

Additional key words

glutamine synthetase nitrogen content quick- and slow-leaf-senescence phenotypes tobacco