New Zealand Journal of Crop and Horticultural Science abstracts
Effect of foliar-applied gibberellins and soil-applied paclobutrazol
on fruit quality at harvest and during storage of `Braeburn' apples
growing under a high-density planting system
T. KHURSHID
D. L. McNEIL
M. C. T. TROUGHT
Department of Plant Science
Lincoln University
P.O. Box 84
Canterbury, New Zealand
Abstract Five-year-old `Braeburn/MM.106' apple (
Malus
domestica Borkh.) trees growing under a high-density (10 000 trees/ha)
planting system were treated with paclobutrazol (PBZ) as a soil drench at 250
mg (a.i.) per tree in August 1993. Gibberellin (GA), GA3 or GA4, was sprayed on
vegetative buds at 0, 10, or 100 ug per bud at three times between 22 November
and 22 December 1992 (before PBZ treatment), or on the same dates in 1993
(after PBZ treatment). Apples harvested from the experimental trees in 1994 and
1995 were evaluated for fruit quality at harvest and during 90 days of storage
at 10deg.C. Time of GA3 or GA4 application did not affect fruit quality at
harvest. PBZ generally increased mean fruit weight the year after and then
decreased 2 years after PBZ application. Fruit L/D ratio was decreased,
deg.Brix values and fruit flesh firmness were generally increased with PBZ
application to the trees. However, the effects were minor. The addition of GA
to PBZ treated trees generally reversed the effects of PBZ. GA4 was more
effective than GA3 in increasing fresh weight and L/D ratio. After 90 days of
storage duration flesh firmness was reduced as an average from 8.4 to 5.2
units, deg.Brix values were increased as an average from 12.9 to 13.2, and
average weight loss reached 13 g/fruit. Time of GA application, PBZ, or GA did
not modify the effects of storage at 10deg.C.
Keywords Malus domestica; apple; high-density;
paclobutrazol; GA3; GA4; plant growth regulators; growth retardant; quality;
storage
New Zealand Journal of Crop and Horticultural Science, 1997, Vol. 25:
59-65
0114-0671/97/2501-0059 $2.50/0 (c) The Royal Society of New Zealand
1997
PDF file of entire paper: medium quality (551K); (scanned from paper original: notes about this process)
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