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Identification and mapping of Tril, a homeodomain-leucine zipper gene involved in multicellular trichome initiation in Cucumis sativus
- Source :
- TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik. 129(2)
- Publication Year :
- 2015
-
Abstract
- Using map-based cloning of Tril gene, we identified a homeodomain-leucine zipper gene involved in the initiation of multicellular trichomes (including the spines of fruit) in cucumber. Fruit spines are a special type of trichome that impacts the quality and appearance of cucumber (Cucumis sativus L.) fruit. Scanning electron microscopy revealed that the trichome-less (tril) mutant originating from European greenhouse cucumber has a completely glabrous phenotype on cotyledons, hypocotyls, young leaves, fruits, and fruit stalks. Genetic analysis revealed that tril was inherited as a recessive allele at a single locus. Using 1058 F2 individuals derived from a cross between cucumber tril mutant CGN19839 and the micro-trichome (mict) mutant 06-2, tril was mapped to chromosome 6, and narrowed down to a 37.4 kb genomic region which carries seven predicted genes. Genetic and molecular analyses revealed that gene Cucsa.045360 is a possible candidate gene for the differentiation of epidermal cells to trichomes. It is a member of the class IV homeodomain-leucine zipper (HD-Zip IV) family and encodes homeodomain and START domain, sharing 66.7 % predicted amino acid sequence identity to PROTODERMAL FACTOR2 (PDF2) and 35.0 % to GLABRA2 (GL2) of Arabidopsis. The homeobox domain had changed amino acid sequence because of an insertion in tril mutant. The results of genetic analysis and transcriptome profiling indicated that the Tril gene had an epistatic effect on the Mict gene in trichome development. Phenotypes of the tril mutant such as glabrous fruits and female flowers at every node could be used in developing new cultivars.
- Subjects :
- 0106 biological sciences
0301 basic medicine
Genetic Markers
Candidate gene
Leucine zipper
DNA, Plant
Mutant
01 natural sciences
Genetic analysis
03 medical and health sciences
Gene Expression Regulation, Plant
Botany
Genetics
Gene
Plant Proteins
Regulation of gene expression
Homeodomain Proteins
Leucine Zippers
biology
food and beverages
Chromosome Mapping
Epistasis, Genetic
General Medicine
Trichomes
biology.organism_classification
030104 developmental biology
Phenotype
Genetic marker
Fruit
Mutation
Cucumis sativus
Transcriptome
Agronomy and Crop Science
Cucumis
010606 plant biology & botany
Biotechnology
Subjects
Details
- ISSN :
- 14322242
- Volume :
- 129
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik
- Accession number :
- edsair.doi.dedup.....0564a9e8c575578e442296cec2268dd9