Articles
Aminoethoxyvinylglycine maintains fruit red skin colour and delays maturation, improving size and quality of PremP009 pear
Article number
1346_104
Pages
813 – 820
Language
English
Abstract
PremP009/PiqaBoo is a new interspecific pear.
Fruit are pyriform with vibrant red skin and a ready-to-eat texture at harvest.
Because of its recent commercialisation, the physiology of PremP009 is not well understood.
From field observations in New Zealand, fruit sometimes exhibit reduced coverage of red skin under high summer temperatures, and fruit drop occurs in some young orchards at harvest.
In pome fruit, fruit development, maturation and abscission are regulated by endogenous hormones, including ethylene.
We treated PremP009 trees with aminoethoxyvinylglycine (AVG, 0.83 g L 1) at three different preharvest timings (mid-December, mid and late January) to elucidate how perturbing ethylene biosynthesis modified fruit development and quality compared with untreated control trees.
In early February, fruit were selectively colour-picked seven times over 25 days.
A Compac grader was used to quantify fruit size and colour.
Across treatments, mean fruit weight increased markedly from day 1 (116 g) to 25 (197 g) of harvest.
These increases in fruit weight were associated with a reducing percentage of red skin over the fruit surface (67 to 36% from day 1 to 25). AVG applied in mid-January (≈20 days before harvest) helped maintain fruits red colour and improve fruit quality but delayed maturation and harvest timing, thereby increasing the fruit weight distribution mean by ≈20 g.
The AVG treatments did not reduce fruit drop at harvest.
Fruit are pyriform with vibrant red skin and a ready-to-eat texture at harvest.
Because of its recent commercialisation, the physiology of PremP009 is not well understood.
From field observations in New Zealand, fruit sometimes exhibit reduced coverage of red skin under high summer temperatures, and fruit drop occurs in some young orchards at harvest.
In pome fruit, fruit development, maturation and abscission are regulated by endogenous hormones, including ethylene.
We treated PremP009 trees with aminoethoxyvinylglycine (AVG, 0.83 g L 1) at three different preharvest timings (mid-December, mid and late January) to elucidate how perturbing ethylene biosynthesis modified fruit development and quality compared with untreated control trees.
In early February, fruit were selectively colour-picked seven times over 25 days.
A Compac grader was used to quantify fruit size and colour.
Across treatments, mean fruit weight increased markedly from day 1 (116 g) to 25 (197 g) of harvest.
These increases in fruit weight were associated with a reducing percentage of red skin over the fruit surface (67 to 36% from day 1 to 25). AVG applied in mid-January (≈20 days before harvest) helped maintain fruits red colour and improve fruit quality but delayed maturation and harvest timing, thereby increasing the fruit weight distribution mean by ≈20 g.
The AVG treatments did not reduce fruit drop at harvest.
Publication
Authors
B. van Hooijdonk, J. Byrne, M. Punter, M. Oliver, D. Dayatilake, J. Johnston
Keywords
planar cordon, grading, ethylene inhibitors, select picking, harvest
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