The content of gibberellin ( GA ) and indole - 3 - acetic acid ( IAA ) in the young - shoot - tips of litchi ( Litchi chinensis Sonn. )荔枝 ( Litchi chinensisSonn. ) 嫩梢顶端的赤霉素 ( GA ) 和吲哚乙酸 ( IAA ) 含量很高,叶片转绿、梢老熟时明显降低,以后才开始花芽...