Carotenogenic gene expression and ultrastructural changes during development in marigold

Marigold ( Tagetes erecta) flowers are a good source of carotenoids and can be used as a model studies on pigmentation during flower development. They show different levels of pigmentation caused by lutein. Here we describe the expression of several genes in the carotenoid biosynthetic pathway: phyt...

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Bibliographic Details
Published in:Journal of plant physiology 2005-09, Vol.162 (9), p.1046-1056
Main Authors: Del Villar-Martínez, Alma A., García-Saucedo, Pedro A., Carabez-Trejo, Alfonso, Cruz-Hernández, Andrés, Paredes-López, Octavio
Format: Article
Language:English
Subjects:
Asteraceae
Biological and medical sciences
Carotenoids
Carotenoids - biosynthesis
Carotenoids - chemistry
Chromoplasts
Flowers - growth & development
Flowers - metabolism
Flowers - ultrastructure
Fundamental and applied biological sciences. Psychology
Gene expression
Gene Expression Regulation, Developmental - physiology
Gene Expression Regulation, Plant - physiology
Lutein
Marigold
Models, Chemical
Molecular and cellular biology
Molecular genetics
Molecular Structure
Plant Proteins - metabolism
RNA, Plant - metabolism
Tagetes - growth & development
Tagetes - metabolism
Tagetes - ultrastructure
Tagetes erecta
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Summary:Marigold ( Tagetes erecta) flowers are a good source of carotenoids and can be used as a model studies on pigmentation during flower development. They show different levels of pigmentation caused by lutein. Here we describe the expression of several genes in the carotenoid biosynthetic pathway: phytoene synthase (Psy), phytoene desaturase (Pds), lycopene β-cyclase (Lcy-b) and lycopene ε-cyclase (Lcy-e). cDNA inserts from isolated clones were 1376–1916 bp long. The predicted amino acid sequences showed from 66 to 100% homology with other reported sequences (NCBI gene bank). Northern blot analyses of three varieties of marigold showed that most gene transcripts were expressed during flower development. The ultrastructural changes that occurred during plastid differentiation in flower morphogenesis were analyzed, and pigment accumulation among varieties was evaluated. The pigment deposition in specific structures (lipidic vesicles) during flower development was demonstrated.
ISSN:0176-1617
1618-1328
DOI:10.1016/j.jplph.2004.12.004