科研之友
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摘要
Post-harvest application of abscisic acid (ABA) can induce stomatal closure in the leaves of cut flower and foliage crops. This effect may be helpful in reducing water deficit stress. Acacia holosericea, a novel cut-foliage line with a short vase-life, was subjected to ABA treatments applied by dipping, pulsing, or in-vase solution, with a view to improving its water balance and extending its longevity. In the first of four experiments, cut single Acacia phyllodes (leaves) were dipped into 0.1, 1.0, or 10.0 mg l(-1) ABA for 60 s. In the second experiment, phyllodes were pulsed with these same ABA concentrations for 24 h at 20 degrees +/- 2 degrees C. In the third experiment, ABA, at the same concentrations, was supplied to phyllodes as a vase solution. In the fourth experiment, cut Acacia whole stems were either dipped in 0.1 mg l(-1) ABA solution, pulsed in 0.1 or 1.0 mg l(-1) ABA, or stood in 0.01 or 0.10 mg l(-1) ABA as vase solutions. Certain ABA dipping and pulsing treatments extended the vase-life of cut phyllodes by up to approx. 1.8-fold and 1.5-fold, respectively. Moreover, the application of ABA as a pulse or vase solution could reduce the uptake of vase solution by cut phyllodes, suggesting the induction of stomatal closure. Lower concentration ABA dip (1.0 mg l(-1)) and pulse (0.1 mg l(-1)) treatments extended the longevity of phyllodes, but high ABA dip and pulse concentrations (10.0 mg l(-1)) were ineffective. ABA in the vase solution at 0.01 mg l(-1) extended the vase-life of cut stems, but did not reduce the uptake of vase solution. Overall, despite some vase-life and water balance benefits, post-harvest ABA treatments were not of value for cut A. holosericea foliage stems because of their inconsistent effects.
- 出版日期2011-3
