摘要:
以国家果树种质福州龙眼圃32份龙眼种质资源为材料,测定分析了其干花中18种氨基酸的含量和组成,并对其营养模式进行分析评价。结果表明,龙眼花中总氨基酸含量(TAA)为8 091.06mg·hg-1,其中谷氨酸含量最高为1 008.26mg·hg-1,而胱氨酸含量最低仅为17.19mg·hg-1,谷氨酸、天门冬氨酸、赖氨酸、亮氨酸、精氨酸、缬氨酸、脯氨酸等7种氨基酸是龙眼花中主要的氨基酸,占TAA含量的59.31%。不同龙眼种质资源中氨基酸积累差异明显,18种氨基酸的变异系数为11.00%~80.01%。营养评价分析表明,32份龙眼花中必需氨基酸(EAA)含量占TAA含量的38.91%~42.94%,2份龙眼共有4项优于氨基酸模式谱比例,(蛋氨酸+胱氨酸)是龙眼花的第一限制氨基酸。龙眼种质资源花中还含有丰富的功能氨基酸和味觉氨基酸。通过聚类分析初步提出龙眼花氨基酸高、中、低分级标准,筛选出5份高氨基酸含量的龙眼特异资源。
关键词:
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龙眼花 /
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种质资源 /
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氨基酸 /
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评价
Abstract:
The amino acid contents and types of longan flower were analyzed based on longan germplasm.The results showed that,total free amino acid content(TAA)was up to 8 091.06mg·hg-1 with all 18 amino acid types,among them the highest amino acid was Glutamic acid(1 008.26 mg·hg-1),and the lowest was Cysteine(17.19 mg·hg-1).Glutamic acid,aspartic acid,lysine,leucine,arginine,valine,proline,seven amino acids were the major amino acids of longan flowers,accounting for 59.31% TAA content.The difference of amino acid was great among the longan genotypes,and the coefficient of variation was from 11.00% to 80.01%in 18 amino acids.The nutrition analysis showed that,the ratio of essential amino acid to total amino acid was from 38.91% to 42.94%.There were two longan genotypes with 4good amino acid model ratios,as for Shiyue longan and Dawuyuan.And(Methionine+Cysteine)was the first limiting amino acid.There were abundant in functional amino acid and tasted amino acid from different longan genotypes.The 3grading criteria of total amino acid contents was proposed based on cluster analysis,and 5longan genotypes with highest amino acid content was selected for special longan germplasm.
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