关键词: 库尔勒香梨, 维管束, 脱萼率

Abstract: In order to explore the relationship between sepal shedding and the development of the vascular bundle in the fruit stalk, carcass and calyx tube of Korla fragrant pear, this paper took Korla fragrant pear as the test mateirial, and sprayed the clear water (CK), indoleacetic acid (IAA) and triiodobenoic acid (TIBA) on the 4th-order fragrant pear of the short-fruit branch inflorescence, respectively, and then compared the dynamic changes of the number and area of vascular bundles in the fruit stem, carcass and calyx tube of the 4th-order fragrant pear during the detachment process. The results showed that: the order of calyx shedding rate of fragrant pear under different treatments was TIBA treatment>CK>IAA treatment. The numbers of vascular bundles in the fruit stalk, carcass and calyx tube of CK and IAA treatments were not significant difference, but were significant higher than those of TIBA treatment. The areas of vascular bundle in the calyx tube of CK and IAA treatments were significant bigger than those of TIBA treatment. The detachment rate was extremely significant negatively correlated with the area of vascular bundle in calyx tube and the number of vascular bundles in the fruit equator of ‘fragrant pear’, and calyx tube was significant negatively correlated with the area of vascular bundle in the fruit stalk and calyx tube. In summary, TIBA should influence the number and area of vascular bundles in calyx tube, inhibit the development of vascular bundles and increase the calyx shedding rate of Korla fragrant pear calyx tube.

Key words: Korla fragrant pear, vascular bundle, calyx shedding rate