GA3 和PP333调控苹果花芽孕育机理的研究

 连续3 年用多效唑(PP₃₃₃) 1 000 mg/L 和赤霉素(GA₃) 1 000 mg/L 处理‘首红’苹果, 结果表明, PP₃₃₃处理降低了芽内吲哚乙酸( IAA) 和赤霉素( GAS) 含量, 增加了玉米素核苷(ZR) 和脱落酸(ABA) 含量, 提高了ZR/ IAA、ZR/ GAS、ABA/ IAA 和ABA/ GAS 比值,从而促进了花芽形成。GA₃ 处理则增加了IAA、GAS 含量, 降低了ZR、ABA 含量, 降低了ZR/IAA、ZR/ GAS、ABA/ IAA 和ABA/ GAS 比值, 从而抑制了花芽形成。PP₃₃₃和GA₃ 在花芽孕育临期内应用效果显著, 在其它时期无效。

Effects of PP333 and GA3 on the Mechanism of Flower Bud Induction in Apple Tree

‘Redchief’and‘Red Fuji’apple tree ( Malus domestica Mill. ) were used as materials to test for the effect of treatments of paclobutrazol ( PP₃₃₃ ) and GA3 on the contents of endogenous hormones in buds. The resultsshowed that the contents of and ZR , and ZR/ IAA , ZR/ GAS , ABA/ IAA and ABA/ GAS ratios in spur bud were remarkably increased , PP₃₃₃ treatment by while GAS and IAA content in spur bud were decreased. The contents of GAS and IAA in spur bud were remarkably increased by GAS treatment , while ZR and ABA content , ZR/ IAA , ZR/ GAS , ABA/ IAA , and ABA/ GAS in spur bud were decreased. As to the effects of spraying PP₃₃₃ or GA₃ , it was noted that PP₃₃₃ could increase the leaf bud node number , but no effect was noted for flower bud ; GA₃ had no effect on the node number of leaf bud , but had a trend to decrease the node number for flower bud.