24-表油菜素内酯处理对转色期‘红地球’葡萄果实品质的影响

Effect of 24-epibrassinolide on fruit quality of‘Red Globe’grape at veraison

为研究油菜素内酯对葡萄果实发育及品质的影响,以‘红地球’葡萄为试验材料,分别采用质量浓度为0.1、0.4、0.8 mg/L的24-表油菜素内酯(24-epibrassinolide,EBR)在葡萄转色初期进行喷洒果穗处理,以清水处理为对照,分别在葡萄果实转色10%、转色50%、转色100%和成熟期进行采样,测定果实的横纵经、果粒重、可溶性固形物(total soluble solids,TSS)、还原糖、可滴定酸(titratable acid,TA)、总酚、单宁和花色苷品质相关指标。结果表明,在葡萄转色期喷施EBR可提高葡萄果粒纵径、横经和果粒重等形态指标,促进果实提早膨大;EBR处理可显著提高葡萄果实TSS含量,降低TA含量,提升葡萄的鲜食品质;同时EBR可提高果皮中总酚、单宁和花色苷含量积累,促进果实提前转色。综合评价,转色期处理的最佳EBR质量浓度为0.4 mg/L。

To study the effect of brassinolide on the development and quality of grape fruit,the‘Red Globe’grapes were used as experimental materials,and 24-epibrassinolide(EBR)with mass concentrations of 0.1,0.4 and 0.8 mg/L were sprayed on grapes at the beginning of grape color change.With water treatment as control(CK),samples were collected at the 10%,50%,and 100%color change stages and maturity stage to measure the quality-related indices of grape fruit such as the fruit’s transverse and longitudinal length,fruit grain weight,soluble solids(TSS),reducing sugar,titratable acid(TA),total phenols,tannin and anthocyanin.Results showed that spraying EBR during the grape veraison period can increase the morphological indicators of grape fruit longitudinal diameter,transverse diameter and fruit weight,and promote the early expansion of fruit.EBR treatment could significantly increase the fruit soluble solid content,reduce the titratable acid content,and improve the fresh eating quality of grape fruit.It could also increase the accumulation of total phenolic content,tannin and anthocyanin content in the grape skin,promoting fruit color change in advance.According to the comprehensive evaluation,the optimal EBR mass concentration in the veraison period was 0.4 mg/L.