title: [Studies on grain filling characteristics in different spikes of triennium-growth Angelica sinensis].
abstract: OBJECTIVE
  To study grain filling characteristics of triennium-growth Angelica sinensis in order to provide theoretic evidence for determining the adapted harvesting time for seeds.
  
  
  METHODS
  1000-grain fresh and dry weight, 100-grain volume, grain length, width and thickness in different spikes which were measured every day from the 8th day afte the head spike bloomed and finally estimated by Logistic equation.
  
  
  RESULTS
  It was the peak filling time when the grain water decreased most rapidly. The grain filling speed, intensity, dry matter accumulation in head spike were all higher than those in the second spike, which resulted in early peak. The seeds in the head spike had advantages in grain filling and their adapted harvesting time should be the 13th day after blooming, when there were 86.2% of dry the maximum matter accumulation and 68.8% as water content in seeds. However, the adapted harvesting time for the seeds in the second spike should be the 14th day after the first spike bloomed, when there were 82.0% of the maximum dry matter accumulation and 72.2% as water content.
  
  
  CONCLUSIONS
  According with the Logistic equation, the grains filling in different spikes had the same duration but differed in the intersity. We should harvest the whole plant seeds at a time, and away the head and below weak spikes before blooming.
authors.affiliation: College of Agronomy, Gansu Agriculture University, Lanzhou 730070, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhao
authors.forename: Yuan
authors.initials: Y
authors.lastname: Chen
authors.forename: Feng-Xia
authors.initials: FX
authors.lastname: Guo
authors.forename: Tian
authors.initials: T
authors.lastname: Li
authors.forename: Jun-Ying
authors.initials: JY
authors.lastname: Wang
authors.forename: Cai-Yun
authors.initials: CY
authors.lastname: Tu
mesh_terms: D029971:Angelica sinensis / Q000254:growth & development* / Q000378:metabolism*; D010946:Plants, Medicinal / Q000254:growth & development* / Q000378:metabolism*; D012621:Seasons; D012639:Seeds / Q000254:growth & development* / Q000378:metabolism; D013997:Time Factors; D014867:Water / Q000378:metabolism
chemical_list: D014867:Water