Apple Peel Biochemical Changes after Foliar Application of Combined Boron and Calcium I. Phenolics and Physico-Chemical Attributes

• 作者: A. Mwije E. Lötze E. W. Hoffman
• 来源期刊: 美国植物学期刊(英文)
• 学科: 数学
• 关键词: FLAVONOIDS Malus domestica SUNBURN
• 年，卷（期）: 2020,（6）
• 页码范围: 965-986
• 页数: 22页
• 分类号: O17

摘要

Post-full bloom foliar applications of boron in combination with calcium (B+Ca) suppress fruit sunburn-browning incidence in apples (<i><span style="font-family:Verdana;">Malus domestica</span></i><span style="font-family:Verdana;">). However, the mode-of-action is not yet explained and hence, protocols to exploit this seemingly cost-effective peel physiology augmenting approach compared to usual methods (shade-netting, overhead cooling and kaolin application which attenuate excess fruit heat-load), cannot be fully developed or promoted justifiably among growers. Apple fruit sunburn-browning disorders are rampant worldwide, partly because of climate change as well as high cost and inefficacy of the established methods. However, knowledge of B+Ca effect on apple peel physiology may unravel the mode-of-action, paving the way for commercialization of this novel approach. In this study, B+Ca effect on apple peel phenolics and selected fruit physico-chemical attributes was investigated, using studies conducted at two farms for two seasons in Western Cape, South Africa. Four foliar treatments varying in B, Ca and inclusion of zinc (Zn), were applied on </span><span style="font-family:Verdana;">‘</span><span style="font-family:Verdana;">Cripps Pink</span><span style="font-family:Verdana;">’</span><span style="font-family:Verdana;">, </span><span style="font-family:Verdana;">‘</span><span style="font-family:Verdana;">Golden Delicious</span><span style="font-family:Verdana;">’</span><span style="font-family:Verdana;"> and </span><span style="font-family:Verdana;">‘</span><span style="font-family:Verdana;">Granny Smith</span><span style="font-family:Verdana;">’</span><span style="font-family:Verdana;"> apples in 2014/15 (only </span><span style="font-family:Verdana;">‘</span><span style="font-family:Verdana;">Cripps Pink</span><span style="font-family:Verdana;">’</span><span style="font-family:;" "=""><span style="font-family:Verdana;">) and 2015/16 (all cultivars) in randomized complete block design experi