title: [Influence of nitrogen forms ratio on growth and photosynthetic characteristics in Prunella vulgaris].
abstract: OBJECTIVE
  The effects of different nitrogen forms on the growth and photosynthetic characteristics of Prunella vulgaris were observed.
  
  
  METHODS
  Water culture experiments were carried out to observe the effects of NH4+: NO3- ratios(100:0, 75: 25, 50:50, 25:75, 0:100 in mmol x L(-1)) on the growth and photosynthetic characteristics of P. vulgaris.
  
  
  RESULTS
  The leaf area, fresh biomass and P(n) of these cultivars increased with the increasing of NH4(+) -N: NO3(-) -N ratios, and they were found to be the highest in 25: 75 NH4(+) -N: NO3)-) -N. However, they decreased with the increasing NH4(+) -N: NO3(-) -N ratio further. P. vulgaris had a minimum leaf area, biomass, chlorophyll content and P(n) in pure ammonium group. The biggest chlorophyll and carotenoid contents were found in the ratios of NH4(+) -N to NO3(-) -N of 50: 50.
  
  
  CONCLUSIONS
  The results indicated that properly increasing nitrate proportion could promote the growth and photosynthesis of P. vulgaris.
authors.affiliation: Institute of Chinese Medicinal Materials, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Manman
authors.initials: M
authors.lastname: Yu
authors.forename: Li
authors.initials: L
authors.lastname: Liu
authors.forename: Qiaosheng
authors.initials: Q
authors.lastname: Guo
authors.forename: Qiong
authors.initials: Q
authors.lastname: Yao
authors.forename: Ning
authors.initials: N
authors.lastname: Zhao
authors.forename: Yuhang
authors.initials: Y
authors.lastname: Chen
mesh_terms: D018533:Biomass; D002734:Chlorophyll; D009584:Nitrogen / Q000737:chemistry* / Q000378:metabolism* / Q000494:pharmacology; D010788:Photosynthesis / Q000187:drug effects; D018515:Plant Leaves / Q000187:drug effects; D031347:Prunella / Q000254:growth & development* / Q000378:metabolism*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry / Q000378:metabolism
chemical_list: D000644:Quaternary Ammonium Compounds; D002734:Chlorophyll; D009584:Nitrogen