Chemically induced cuticle mutation affecting epidermal conductance to water vapor and disease susceptibility in Sorghum bicolor (L.) Moench

Analysis of Sorghum bicolor bloomless (bm) mutants with altered epicuticular wax (EW) structure uncovered a mutation affecting both EW and cuticle deposition. The cuticle of mutant bm-22 was about 60% thinner and approximately one-fifth the weight of the wild-type parent P954035 (WT-P954035) cuticle...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1994-08, Vol.105 (4), p.1239-1245
Main Authors: Jenks, M.A. (University of Arizona, Tucson, AZ.), Joly, R.J, Peters, P.J, Rich, P.J, Axtell, J.D, Ashworth, E.N
Format: Article
Language:English
Subjects:
Adaptation to environment and cultivation conditions
Agronomy. Soil science and plant productions
ANATOMIA DE LA PLANTA
ANATOMIE VEGETALE
Animal cuticle
Biological and medical sciences
Disease susceptibility
Environmental and Stress Physiology
Epicuticular wax
EPIDERME
EPIDERMIS
Fundamental and applied biological sciences. Psychology
GENE
GENES
Genetic mutation
Genetics and breeding of economic plants
MUTANT
MUTANTES
Pest resistance
Phenotypes
Plant cuticle
Plant pathogens
Plants
PODER PATOGENO
POUVOIR PATHOGENE
Segregation
SETOSPHAERIA TURCICA
Sorghum
SORGHUM BICOLOR
TRANSPIRACION
TRANSPIRATION
Varietal selection. Specialized plant breeding, plant breeding aims
Water loss
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Summary:Analysis of Sorghum bicolor bloomless (bm) mutants with altered epicuticular wax (EW) structure uncovered a mutation affecting both EW and cuticle deposition. The cuticle of mutant bm-22 was about 60% thinner and approximately one-fifth the weight of the wild-type parent P954035 (WT-P954035) cuticles. Reduced cuticle deposition was associated with increased epidermal conductance to water vapor. The reduction in EW and cuticle deposition increased susceptibility to the fungal pathogen Exserohilum turcicum. Evidence suggests that this recessive mutation occurs at a single locus with pleiotropic effects. The independently occurring gene mutations of bm-2, bm-6, bm-22, and bm-33 are allelic. These chemically induced mutants had essentially identical EW structure, water loss, and cuticle deposition. Furthermore, 138 F2 plants from a bm-22 X WT-P954035 backcross showed no recombination of these traits. This unique mutation in a near-isogenic background provides a useful biological system to examine plant cuticle biosynthesis, physiology, and function
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.105.4.1239