College of Horticulture, Nanjing Agricultural University , Nanjing, P.R. China.
Hortic Res. 2016 Aug 10;3:16037. doi: 10.1038/hortres.2016.37. eCollection 2016.
Lateral floral clusters were removed from the main axis of the floral clusters of 'Houman' grape plants, leaving only 3-5-cm-long region of flowers at the end of the central axis. The floral clusters were pruned at 7 days prior to flowering. The effect of the pruning on fruit quality was assessed by determining the composition and levels of anthocyanins in the fruit and anthocyanin-related gene expression. Results indicated that floral cluster pruning significantly improved the quality of the fruit by increasing berry size, fruit weight and the total content of soluble solids. Floral cluster pruning also decreased the level of titratable acidity. Sixteen different anthocyanins were detected in fruit of the pruned clusters, while only 15 were detected in fruit from unpruned clusters. The level of anthocyanins was also significantly higher in fruit of the pruned clusters than in the unpruned clusters. Anthocyanin-related gene expression was also significantly upregulated to a higher level in fruit from pruned floral clusters as compared with unpruned clusters. The upregulation was closely associated with increases in anthocyanin biosynthesis.
从‘厚曼’葡萄植株的花序主轴上除去侧生花序簇，仅在中央轴的末端留下 3-5 厘米长的花区。在开花前 7 天修剪花序。通过测定果实中花色苷的组成和含量以及花色苷相关基因的表达，评估修剪对果实品质的影响。结果表明，花序修剪通过增加浆果大小、果实重量和可溶性固形物总量显著提高了果实品质。花序修剪还降低了可滴定酸度水平。在修剪后的果簇中检测到 16 种不同的花色苷，而在未修剪的果簇中仅检测到 15 种花色苷。修剪后的果簇中花色苷的含量也明显高于未修剪的果簇。与未修剪的果簇相比，修剪后的果簇中花色苷相关基因的表达也显著上调到更高水平。这种上调与花色苷生物合成的增加密切相关。
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