Eur.J.Hortic.Sci. 80 (3) 103-108 | DOI: 10.17660/eJHS.2015/80.3.2|
ISSN 1611-4426 print and 1611-4434 online | © ISHS 2015 | European Journal of Horticultural Science | Original article
Improving fruit size and quality of low yielding and small fruited pear cultivars with benzyladenine and gibberellin applications
F.A. Canli1 and M. Pektas2
1 Department of Biotechnology, Faculty of Agriculture, Suleyman Demirel University, Isparta, Turkey
2 West Mediterranean Development Agency, Isparta, Turkey
This study was conducted to determine the effects of benzyladenine (BA) and BA plus gibberellin (GA) treatments on fruit size and quality of ‘Akca’ pear (Pyrus communis), a low yielding and a small fruited summer variety. Pear trees were sprayed to run off 14 d after full bloom with BA (50, 100 and 150 ppm) or BA+GA4+7 (concentrations of each chemical; 12.5, 25, and 50 ppm). Fruits were harvested and evaluated in terms of fruit size and quality parameters. Higher concentrations of BA+GA4+7 (25 and 50 ppm) and the medium concentration of BA (100 ppm) increased fruit weight, fruit diameter and fruit length. The highest fruit weights and the highest fruit lengths were obtained from 25 ppm BA+GA4+7 and 50 ppm BA+GA4+7 treatments. Compared to weight of control fruit (48.85 g), 25 ppm BA+GA4+7 applications resulted in a 20.2% increase in fruit weight (58.71 g). ‘Akca’ pear showed different responses to BA and BA + GA4+7 applications. In 25 and 50 ppm BA + GA4+7 treatments, the increases in fruit weight were accompanied by heavy reductions in yield (54.3% and 59.9%, respectively), while in 100 ppm BA application fruit size of ‘Akca’ pear was significantly improved (11.3%) with no influence on yield. Fruits treated with 25 ppm and 50 ppm BA+GA4+7 and 100 ppm BA had higher pedicel lengths than the control. Plant growth regulator (PGR) treated fruit had higher soluble solid content (SSC) than the untreated fruit. Treatments did not affect fruit pH. Higher rates of BA and BA+GA4+7 resulted in fruit that were darker, greener and less yellow. In conclusion, BA at 100 ppm can be a suitable tool for increasing fruit quality and size of low cropping and small fruited summer pears, with no negative influence on yield and fruit shape.
BA, firmness, fruit color, fruit weight, GA4+7, Pyrus communis, SSC
Significance of this study
What is already known on this subject?
What are the new findings?
BA and BA+GA4+7 applications increase fruit size of some fruits. However there are a few studies on the effects of BA and GAs on fruit size of pear and these studies are limited to a few regions and varieties. There are no studies testing the effects of BA and BA+GA4+7 on fruit size of low yielding summer pears which do not require thinning.
What is the expected impact on horticulture?
BA at 100 ppm substantially improved fruit size of ‘Akca’ pear with no negative influence on yield and fruit shape.
This treatment can be potentially used to increase the fruit size and the quality of the low cropping and the small fruited summer pears.
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Received: 6 August 2014 | Revised: 4 November 2014 | Accepted: 18 November 2014 | Published: 17 June 2015 | Available online: 17 June 2015