Relationship between xylem functionality, calcium content and the incidence of bitter pit in apple fruit

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• 作者：Aquidauana Miqueloto ; Cass ; ro Vidal Talamini do Amarante ; Cristiano Andr茅 Steffens ; Aline dos Santos ; Elizabeth Mitcham
• 关键词：Malus x domestica ; Fruit growth ; Xylem Vascular system ; Mineral content ; Physiological disorder
• 刊名：Scientia Horticulturae
• 出版年：22 January, 2014
• 年：2014
• 卷：165
• 期：Complete
• 页码：319-323
• 全文大小：763 K

文摘

The objective of this study was to evaluate the relationship between xylem functionality, calcium (Ca) deficiency and the incidence of bitter pit (BP) in 鈥楩uji鈥?and 鈥楥atarina鈥?apples (low and high susceptibility to BP, respectively). Fruits were assessed for fresh weight, xylem functionality (of primary and secondary cortical vascular bundles) and mineral content (Ca, Mg, K, and N) during development (40-188 days after full bloom DAFB), as well as for the incidence (%) and severity of BP at commercial harvest (188 DAFB). During fruit development, 鈥楥atarina鈥?apples demonstrated an earlier loss of xylem functionality, lower Ca content, higher K content, and higher K/Ca, (K + Mg)/Ca and (K + Mg + N)/Ca ratios compared to 鈥楩uji鈥?apples. The large loss in xylem functionality in 鈥楥atarina鈥?apples which led to a higher (K + Mg + N)/Ca ratio in the fruit seems to explain the higher susceptibility to BP as compared to 鈥楩uji鈥? Showing with this, the xylem functionality may be a key physiological to infer about this disorder.