Measham, PF and MacNair, N and Bound, SA and Quentin, A, To cut or not to cut: the role of extension growth in fruit quality, Acta Horticulturae, 1161 pp. 627-632. ISSN 0567-7572 (2017) [Refereed Article]
Copyright 2017 ISHS
Extension growth occurs throughout the fruit growing season and has the potential to be a strong source of assimilates. However, while growing they can also be a strong sink; hence the question; to cut or not to cut? Summer pruning can be useful to reduce vigour, or promote light interception but can it also be used to reduce competition for assimilates between growing fruit and extension growth?
Trials assessing fruit quality from trees (cvs. ‘Kordia’, ‘Sweetheart’ and ‘Satonishiki’) which had been pruned at various times throughout the growing season were undertaken. Timing had a significant impact on fruit quality with pruning after, but not at, Stage II increasing fruit sugars (TSS). Pruning at most stages had no impact on sugars in newly developing buds. Pruning during Stage III increased current season fruit sugars. Pruning did not affect the uniformity of bud burst or yield in the following season. Therefore, used appropriately, summer pruning of extension growth may be a useful tool in promoting sugar assimilation.
Furthermore, pruning during rainfall in the three weeks prior to harvest maturity reduced fruit cracking, while pruning prior to rainfall in the same period did not impact on cracking. This implicates a role of extension growth leaves in the supply of excess water to the fruit reducing both yield and quality such that pruning could increase both yield and quality.
|Item Type:||Refereed Article|
|Keywords:||plant physiology, fruit quality, summer pruning, sugars|
|Research Division:||Agricultural and Veterinary Sciences|
|Research Group:||Horticultural Production|
|Research Field:||Horticultural Crop Growth and Development|
|Objective Division:||Plant Production and Plant Primary Products|
|Objective Group:||Horticultural Crops|
|Objective Field:||Stone Fruit|
|Author:||Measham, PF (Dr Penny Measham)|
|Author:||MacNair, N (Mr Nicholas MacNair)|
|Author:||Bound, SA (Dr Sally Bound)|
|Deposited By:||Tasmanian Institute of Agriculture|
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