Inheritance of hydrogen potential (pH) and titratable acidity in the melon

ABSTRACT Acidity is one of the main determinants of the taste and quality of melon fruit, together with sugars and volatile compounds. The aim of this study was to investigate the inheritance of hydrogen potential (pH) and titratable acidity in melon fruit. A randomized block design with three replications was used to evaluate the F1 and F2 generations and backcrosses (RC1 and RC2) of the Védrantais melon (Cucumis melo subsp. melo var. reticulatus) with high pH and low titratable acidity, and of the AC-16 melon (C. melo subsp. melo var acidulus), with low pH and high titratable acidity. Inheritance of pH and titratable acidity in the melon is complex, and each involves a major gene with additive and dominance effects associated with polygenes with additive effects.

摘要：酸度与可溶性糖、挥发性化合物共同构成甜瓜果实风味与品质的核心决定因素之一。本研究旨在解析甜瓜果实pH值（氢离子电位，hydrogen potential）与滴定酸度（titratable acidity）的遗传规律。本研究采用三次重复的随机区组设计方案，对高pH值、低滴定酸度的韦德拉奈（Védrantais）甜瓜（Cucumis melo subsp. melo var. reticulatus），以及低pH值、高滴定酸度的AC-16甜瓜（C. melo subsp. melo var acidulus）的F1代、F2代及回交后代（RC1、RC2）进行性状评价。结果表明，甜瓜pH值与滴定酸度的遗传机制较为复杂，二者均由1个兼具加性与显性效应的主效基因，以及若干仅具加性效应的多基因共同调控。