title: [Effect of different developmental stage on plant growth and active compounds in Scutellaria baicalensis].
abstract: OBJECTIVE
  To study the developmental phase on the growth and active compounds in Scutellaria baicalensis.
  
  
  METHODS
  Seeds of wild plants were collected from Laiwu and sowed in Fangshan (Beijing) and Laiwu (Shandong). Samples of aerial and underground parts were collected in five growth periods of sprouts, seedlings, flowering, seed drop and withered periods respectively. The length of taproot, fresh weight of root, diameter of taproot and the length of stem were determined. The content of active compounds and total flavonoids were determined by HPLC and ultraviolet spectrophotometry respectively. The transcripted level of PAL1, PAL2, PAL3, C4H, 4CL, CHS, GUS and UBGAT were analyzed with RT-PCR.
  
  
  RESULTS
  The results showed that the aerial part of S. baicalensis grew quickly before flowering stage, and the underground part grew mostly between the periods of flowering and withered. In the whole growing developmental periods, the content of total flavonoids was not changed significantly, the content of baicalin was increased gradually and the content of baicalein was decreased gradually. Expression level of PAL and 4CL was the highest in withered period, CHS was increased between flowering and seed drop and decreased in withered period.
  
  
  CONCLUSIONS
  Seedlings and withered periods may be the key phase affecting the growth and active compounds in S. baicalensis.
authors.affiliation: Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China.
authors.forename: Guo-Qiang
authors.initials: GQ
authors.lastname: Hu
authors.forename: Yuan
authors.initials: Y
authors.lastname: Yuan
authors.forename: Chong
authors.initials: C
authors.lastname: Wu
authors.forename: Chao
authors.initials: C
authors.lastname: Jiang
authors.forename: Zhou-Yong
authors.initials: ZY
authors.lastname: Wang
authors.forename: Shu-Fang
authors.initials: SF
authors.lastname: Lin
authors.forename: Zhi-Gang
authors.initials: ZG
authors.lastname: Wu
mesh_terms: D000217:Acyltransferases / Q000235:genetics / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D003066:Coenzyme A Ligases / Q000235:genetics / Q000378:metabolism; D005419:Flavonoids / Q000032:analysis* / Q000378:metabolism; D035264:Flowers / Q000235:genetics / Q000254:growth & development / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental; D015971:Gene Expression Regulation, Enzymologic; D018506:Gene Expression Regulation, Plant; D005966:Glucuronidase / Q000235:genetics / Q000378:metabolism; D014453:Glucuronosyltransferase / Q000235:genetics / Q000378:metabolism; D010650:Phenylalanine Ammonia-Lyase / Q000235:genetics / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D018517:Plant Roots / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism; D018547:Plant Stems / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D031364:Scutellaria baicalensis / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism; D036226:Seedlings / Q000235:genetics / Q000254:growth & development / Q000378:metabolism; D013056:Spectrophotometry, Ultraviolet; D013997:Time Factors; D050564:Trans-Cinnamate 4-Monooxygenase / Q000235:genetics / Q000378:metabolism
chemical_list: D005419:Flavonoids; D010940:Plant Proteins; C038044:baicalin; D050564:Trans-Cinnamate 4-Monooxygenase; D000217:Acyltransferases; C020141:flavanone synthetase; C411122:UDP-glucuronate baicalein 7-O-glucuronosyltransferase; D014453:Glucuronosyltransferase; D005966:Glucuronidase; D010650:Phenylalanine Ammonia-Lyase; D003066:Coenzyme A Ligases; C019943:4-coumarate-CoA ligase