Evaluation of ‘Sun Protect’ in protecting apples (Malus × domestica Borkh.) against sunburn

https://doi.org/10.17221/200/2015-HORTSCICitation:Sotiropoulos T., Petridis A., Koukourikou-Petridou M., Koundouras S. (2016): Evaluation of ‘Sun Protect’ in protecting apples (Malus × domestica Borkh.) against sunburn. Hort. Sci. (Prague), 43: 175-180.
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Sunburn is a major type of solar radiation injury that leads to significant economic losses in several fruits, including apples. Here, the efficiency of a new product, called ‘Sun Protect’, in protecting apples (cv. Granny Smith) against sunburn was tested. The effect of ‘Sun Protect’ application was further examined on fruit quality characteristics, including soluble solids, acidity, flesh firmness, total phenol content and antioxidant activity, at harvest and after a 4-month period of storage. Spraying apple trees with ‘Sun Protect’ resulted in better fruit coloration and no visual symptoms of sunburn. On the other hand, fruit quality characteristics were not affected by the treatment. After storage for four months, apples sprayed with ‘Sun Protect’ retained their intense green colour in relation to the green-yellowish appearance of the untreated ones. Results on photosynthetic parameters revealed that there was no negative effect of the treatments on gas exchange of the leaves; moreover, sprayed trees showed a higher water use efficiency in comparison to the control. Our results provide evidence that ‘Sun Protect’ protects apples from sunburn injury and increases their marketability.
References:
Benzie Iris F.F., Strain J.J. (1996): The Ferric Reducing Ability of Plasma (FRAP) as a Measure of “Antioxidant Power”: The FRAP Assay. Analytical Biochemistry, 239, 70-76  https://doi.org/10.1006/abio.1996.0292
 
Evans R.G., van der Gulik T.W. (2011): Irrigation for microclimate control. In: Stetson L., Dedrick A. (eds): Irrigation. 6th Ed. The Irrigation Association. Falls Church, VA.: 1015–1036.
 
Felicetti David A., Schrader Larry E. (2008): Photooxidative Sunburn of Apples: Characterization of a Third Type of Apple Sunburn. International Journal of Fruit Science, 8, 160-172  https://doi.org/10.1080/15538360802526472
 
Felicetti David A., Schrader Larry E. (2009): Changes in pigment concentrations associated with sunburn browning of five apple cultivars. II. Phenolics. Plant Science, 176, 84-89  https://doi.org/10.1016/j.plantsci.2008.09.010
 
Glenn D.M. (2009): Particle film mechanisms of action that reduce the effect of environmental stress in ‘Empire’ apple. Journal of the American Society of Horticultural Science, 134: 314–321.
 
Havaux M. (2003): Chloroplast Membrane Photostability in chlP Transgenic Tobacco Plants Deficient in Tocopherols. PLANT PHYSIOLOGY, 132, 300-310  https://doi.org/10.1104/pp.102.017178
 
Koukourikou-Petridou M., Voyatzis D., Stylianidis D., Sotiropoulos T., Therios I. (2007): Effects of some growth regulators on pre and after storage quality of Red Chief Delicious apples. European Journal of Horticultural Science, 72: 8–11.
 
Lolicato S. (2011): Sunburn protection for fruit – a practical manual for orchardists in northern Victoria. Department of Environment and Primary Industries, Victoria, Australia.
 
Sattler S. E. (2003): Characterization of Tocopherol Cyclases from Higher Plants and Cyanobacteria. Evolutionary Implications for Tocopherol Synthesis and Function. PLANT PHYSIOLOGY, 132, 2184-2195  https://doi.org/10.1104/pp.103.024257
 
Schrader L., Zhang J., Sun J. (2003): ENVIRONMENTAL STRESSES THAT CAUSE SUNBURN OF APPLE. Acta Horticulturae, , 397-405  https://doi.org/10.17660/ActaHortic.2003.618.47
 
Singleton V.L., Orthhofer R., Lamuela-Raventos R.M. (1999): Analysis of total phenols and other oxidation substrates and antioxidants by means of Folin-Ciocalteu reagent. Methods Enzymology, 299: 152–178.
 
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