ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Effects of GA4+7 plus BA on postproduction quality of pot tulips

Hye-Ji Kim and William B. Miller

Abstracts of 27th International Horticultural Congress & Exhibition (IHC 2006), August 13-19, 2006, COEX (Convention & Exhibition), Seoul, Korea. 494 pages.

2006

บทคัดย่อ

Previously we reported that GA₄₊₇ plus benzyladenine (BA) significantly enhances longevity of pot ‘Seadov’ tulip (Tulipa gesneriana). In this experiment, we extended the survey to several tulip cultivars having distinctive senescence symptoms; ‘Friso’ (wilting-type), ‘Bel Air’ (wilting-abscission-type: abscission shortly after tepal wilting) and ‘Bright Parrot’ (abscission-type: abscission without wilting).Plants were sprayed with 0, 10 or 50 ppmGA₄₊₇ plus BA and placed in a simulated consumer environment to evaluate the effectiveness of GA₄₊₇ plus BA for enhancing postproduction quality.The effectiveness of GA₄₊₇ plus BA greatly varied with cultivar.It significantly increased whole plant longevity of ‘Friso’ by more than 3 days regardless of concentration, while it had less effect o­n ‘Bel Air’ and no effect o­n ‘Bright Parrot’.Individual flower longevity of ‘Friso’ was significantly enhanced by pretreatment with GA₄₊₇ plus BA regardless of the concentration.However, that of ‘Bel Air’ was enhanced o­nly by 50 ppmGA₄₊₇ plus BA, and ‘Bright Parrot’ was not affected by any concentration of GA₄₊₇ plus BA.Spay with fluoridone (putative inhibitor of ABA biosynthesis) somewhat extended longevity of the whole plant and individual flowers of ‘Bright Parrot’, and TIBA (auxin transport inhibitor) did the opposite, suggesting possible mechanisms of flower senescence in ‘Bright Parrot’.This study demonstrates that different senescence symptom of tulip flowers may involve different mechanisms of hormonal regulation and that sprays with GA₄₊₇ plus BA can be useful to enhance postproduction quality in wilting-or wilting-abscission-type tulip flowers.

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