首页|Molecular cloning,characterization and promoter analysis of LbgCWIN1 and its expression profiles in response to exogenous sucrose during in vitro bulblet initiation in lily
Molecular cloning,characterization and promoter analysis of LbgCWIN1 and its expression profiles in response to exogenous sucrose during in vitro bulblet initiation in lily
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Lily(Lilium spp.)is an important ornamental flower,which is mainly propagated by bulbs.Cell wall invertases(CWINs),which catalyze the irreversibly conversion of sucrose into glucose and fructose in the extracellular space,are key enzymes participating in sucrose allocation in higher plants.Previous studies have shown that CWINs play an essential role in bulblet initiation process in bulbous crops,but the underlying molecular mechanism remains unclear.Here,a CWIN gene of Lilium broumii var.giganteum(Lbg)was identified and amplified from genomic DNA.Quantitative RT-PCR assays revealed that the expression level of LbgCWIN1 was highly upregulated exactly when the endogenous starch degraded in non-sucrose medium during in vitro bulblet initiation in Lbg.Phylogenetic relationship,motif,and domain analysis of LbgCWIN1 protein and CWINs in other plant species showed that all sequences of these CWIN proteins were highly conserved.The promoter sequence of LbgCWIN1 possessed a number of alpha-amylase-,phytohormone-,light-and stress-responsive cis-elements.Meanwhile,β-glucuronidase(GUS)assay showed that the 459 bp upstream fragment from the translational start site displayed maximal promoter activity.These results revealed that LbgCWIN1 might function in the process of in vitro bulblet initiation and be in the response to degradation of endogenous starch.
Genomics and Genetic Engineering Laboratory of Ornamental Plants,Institute of Landscape Architecture,College of Agriculture and Biotechnology,Zhejiang University,Hangzhou,Zhejiang 310058,China
Laboratory of Flower Bulbs,Department of Landscape Architecture,School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou,Zhejiang 310018,China
国家自然科学基金国家自然科学基金Zhejiang Science and Technology Major Program on Agricultural New Variety Breeding
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