【摘要】 为明确北方寄主苹果、桃、梨、石榴对橘小实蝇Bactrocera dorsalis耐寒性的影响，以取食南方寄主香蕉为参照，测定取食苹果、桃、梨、石榴的橘小实蝇老熟幼虫、5日龄蛹和5日龄成虫的过冷却点和结冰点，比较取食不同寄主果实后这3种虫态橘小实蝇体内含水量及糖原、山梨醇、海藻糖和蛋白质等耐寒物质含量的差异，并分析它们之间的相关性。结果表明：取食不同寄主果实后橘小实蝇的过冷却点和结冰点存在显著差异，取食石榴的5日龄蛹的过冷却点（-9.29℃）和结冰点（-9.00℃）最低，显著低于取食桃、苹果和梨的5日龄蛹的过冷却点和结冰点，且显著低于取食石榴的老熟幼虫和5日龄成虫。取食不同寄主果实后橘小实蝇体内含水量、糖原、海藻糖等物质的含量存在显著差异。取食石榴的5日龄蛹体内含水量（69.21%）显著低于取食梨的5日龄蛹体内含水量；取食桃的老熟幼虫体内糖原含量（15.24 mg/g）显著高于取食苹果和梨的老熟幼虫体内糖原含量，取食石榴（1.66 mg/g）和桃（1.56 mg/g）的5日龄成虫体内海藻糖含量显著高于取食梨的5日龄成虫体内海藻糖含量；取食桃的5日龄成虫体内蛋白质含量（29.94 mg/g）显著高于取食梨的5日龄成虫体内蛋白质含量。不同虫态橘小实蝇的过冷却点与结冰点呈正相关，与糖原含量呈负相关。表明取食桃和石榴的橘小实蝇种群有较强的耐寒性，因此在北方应加强桃园和石榴园橘小实蝇的监测。更多还原

【Abstract】 To clarify the effects of northern host fruits(apple, peach, pear, and pomegranate) on the cold tolerance of oriental fruit fly Bactrocera dorsalis, individuals reared on the southern host banana were used as the control. The supercooling points(SCP)and freezing points(FP)of mature larvae, 5-day-old pupae, and 5-day-old adults of B. dorsalis fed on the four northern fruits were determined. Differences in water content and cold-tolerance-related substances(glycogen, sorbitol, trehalose, and protein) in the three developmental stages after feeding on different host fruits were compared, and the correlations among these indices were analyzed. The results demonstrated significant differences in SCP and FP of B. dorsalis after host fruit treatments. Pupae fed on pomegranate exhibited the lowest SCP(-9.29 ℃) and FP(-9.00 ℃), significantly lower than those of pupae fed on peach, apple and pear, and significantly lower than those of mature larvae and adults fed on pomegranate. Significant variations were also observed in water content and the levels of glycogen, trehalose and other substances. The water content of 5-day-old pupae fed on pomegranate(69.21%) was significantly lower than that of pupae fed on pear. Mature larvae fed on peach(15.24 mg/g) had significantly higher glycogen levels(15.24 mg/g) than those fed on apple and pear. Trehalose contents in adults fed on pomegranate(1.66 mg/g) and peach(1.56 mg/g) were significantly higher than in adults fed on pear. In addition, adults fed on peach showed significantly higher protein levels(29.94 mg/g) than those fed on pear. Across all developmental stages, SCP and FP were positively correlated, while SCP was negatively correlated with glycogen content. These findings suggest that B. dorsalis populations feeding on peach and pomegranate exhibit stronger cold tolerance. Therefore, enhanced monitoring of B. dorsalis is recommended in peach and pomegranate orchards in northern regions.更多还原