31份枇杷种质资源的果实氨基酸含量及组分分析

测定31份枇杷种质资源果实氨基酸含量及组成。结果表明：氨基酸总量（TAA）最高为单边种（519.15 mg/hg），最低为新西兰白肉（228.66 mg/hg），变异系数为17.18％；31份种质均含有17种氨基酸，天冬氨酸和谷氨酸是最主要的2种氨基酸；17种氨基酸中，甲硫氨酸的变异系数最高（47.86％），甘氨酸的变异系数最低（12.71％）；必需氨基酸平均含量94.95 mg/hg，占TAA的29.10％；鲜味氨基酸平均含量144.44 mg/hg，占TAA的43.04％；药用氨基酸极高，占TAA的71.94％；野生种质人体必需氨基酸/总氨基酸比值显著高于栽培种质；来自日本的种质芳香族氨基酸含量较高；红肉种质与白肉种质各类氨基酸含量差异不显著。

The Content and Composition of Amino Acids in 31 Loquat Germplasms

The amino acids in the fruits of 31 Loquat Germplasms were assayed. The results showed that the highest TAA(total amino acids)was found in Danbianzhong Loquat, which was 519.15 mg/hg. The lowest TAA was found in Xinxilanbairou Loquat, which was 228.66 mg/hg. The coefficient of variation of TAA was 17.1%. 31 samples all contained 17 amino acids among which Asp and Glu were the main amino acids. Among the 17 amino acids, Met had the highest coefficient of variation and Gly had the lowest coefficient of variation. The average essential amino acids content was 94.95 mg/hg, accounted for 29.10% of the total amino acids content. The delicious amino acids content was 144.44 mg/hg, accounted for 43.04% of the total amino acids content. The pharmacological amino acids accounted for 71.94% of the total amino acids content. EAA/TAA of the wild germplasms were much higher than that of the cultivars. Aromatic amino acids of germplasms came from Japan were higher than that of the species came from other regions. The difference of different types of amino acids between red flesh and white flesh species was not significant.