Role of Endogenous Gibberellins in Cold-Induced Stem Elongation and Flowering of Japanese Radish (Raphanus sativus L.).

摘要: Eighteen endogenous gibberellins (GAs) which belong to the early 13-hydroxylation pathway and non-hydroxylation of GA-biosynthesis were identified by combined gas chromatography/mass spectrometry (GC/MS) in shoots a cold-requiring plant, Raphanus sativus L. Contents GA1 GA4, probable biologically-active GAs, increased stem during long-day condition (LD) both with or without prior cold treatment (CT); however, increase was greater CT than it. In contrast contents 3β-hydroxylated GAs (i.e. GA4), that GA34, 2β-hydroxylated GA, decreased significantly LD, indicating LD activated 3β-hydroxylation inactivated 2β-hydroxylation course GA-biosynthesis. GA4 leaf subsequent CT, whereas they alone. The probably promoted cold-induced elongation flowering R. sativus.