Full Length Research Paper
Abstract
This study investigated the changes of five endogenous hormones in the shoot apex and the white bases of D-leaf during the inflorescence induction and development of ‘Smooth Cayenne’ pineapple, using 14-month-old pot-grown plants as material and ethephon as flower forcing agent. Results showed that application of ethephon increased the level of endogenous ethylene (C2H4), abscisic acid (ABA) and 2-isopentyl adenine (2-iP) while it decreased the concentration of indole-3-acetic acid (IAA), gibberellic acid (GA3) and zeatin (ZT), and led to the transition of vegetative growth to inflorescence initiation. After inflorescence initiation, the contents of C2H4, ABA and 2-iP declined but the contents of IAA, ABA and ZT increased. These results indicated that low levels of IAA, GA3 and ZT and high levels of C2H4, ABA and 2-iP facilitated inflorescence initiation, while high levels of ZT, IAA and GA3 and low levels of C2H4 and ABA facilitated inflorescence development.
Key words: Pineapple, inflorescence initiation, inflorescence development, endogenous hormone.
Abbreviation
ABA, Abscisic acid; ZT, zeatin; IAA, indole-3-acetic acid; GA3,gibberellic acid; C2H4, ethylene; 2iP, 2-isopentyl adenine; AVG,aminoethoxyvinylglycine; HPLC, high-performance liquid chromatography; FID,flame ionization detector; GC, gas chromatograph
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