Vol. 80 No: 1

Title:
Identification and characterisation of a gibberellin-related dwarf mutant in pumpkin (Cucurbita moschata)

Authors:
JIASHU CAO, HUIFANG YU, WANZHI YE, XIAOLIN YU, LECHENGU LIU, YONGQIN WANG and XUN XIANG

pp: 29-31

Abstract:
'Non-vine I' is a dwarf variety of pumpkin (Cucurbita moschata) with short vines, while 'Yellow wolf' is a normal variety with long vines.The phenotypes of 'Non-vine I' and 'Yellow wolf' pumpkin were compared, and changes in the length of the vine in 'Non-vine I' were observed after treatment with gibberellin A₃ (GA₃), naphthylacetic acid (NAA) or brassinolide (BL). Cell sizes in the internode in 'Non-vine I' were then observed and compared after application of 0.6 mM GA₃ or water (control).The results obtained showed that: (1) the morphological characteristics of 'Non-vine I' plants were similar to normal pumpkins except for the vine trait; (2) 'Non-vine I' plants were sensitive to exogenous GA3 which significantly promoted the elongation of vines and petioles, but did not respond to exogenous auxin (NAA) or brassinolide (BL); (3) internode cells of 'Non-vine I' plants were shorter than those of normal pumpkins, and GA₃ promoted internode cell elongation in 'Non-vine I' plants. We propose that 'Non-vine I' is a GA-related mutant, and the dwarf trait results from the failure of normal internode cell elongation.

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