title: Morphological, genetic and molecular characteristics of barley root hair mutants.
abstract: Root hairs are tubular outgrowths of specialized epidermal cells called trichoblasts. They affect anchoring plants in soil, the uptake of water and nutrients and are the sites of the interaction between plants and microorganisms. Nineteen root hair mutants of barley representing different stages of root hair development were subjected to detailed morphological and genetic analyses. Each mutant was monogenic and recessive. An allelism test revealed that nine loci were responsible for the mutated root hair phenotypes in the collection and 1-4 mutated allelic forms were identified at each locus. Genetic relationships between the genes responsible for different stages of root hair formation were established. The linkage groups of four loci rhl1, rhp1, rhi1 and rhs1, which had previously been mapped on chromosomes 7H, 1H, 6H and 5H, respectively, were enriched with new markers that flank the genes at a distance of 0.16 cM to 4.6 cM. The chromosomal position of three new genes - two that are responsible for the development of short root hairs (rhs2 and rhs3) and the gene that controls an irregular root hair pattern (rhi2) - were mapped on chromosomes 6H, 2H and 1H, respectively. A comparative analysis of the agrobotanical parameters between some mutants and their respective parental lines showed that mutations in genes responsible for root hair development had no effect on the agrobotanical performance of plants that were grown under controlled conditions. The presented mutant collection is a valuable tool for further identification of genes controlling root hair development in barley.
authors.affiliation: Department of Genetics, University of Silesia, Jagiellonska 28, 40-032, Katowice, Poland.
authors.forename: Beata
authors.initials: B
authors.lastname: Chmielewska
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Janiak
authors.forename: Jagna
authors.initials: J
authors.lastname: Karcz
authors.forename: Justyna
authors.initials: J
authors.lastname: Guzy-Wrobelska
authors.forename: Brian P
authors.initials: BP
authors.lastname: Forster
authors.forename: Malgorzata
authors.initials: M
authors.lastname: Nawrot
authors.forename: Anna
authors.initials: A
authors.lastname: Rusek
authors.forename: Paulina
authors.initials: P
authors.lastname: Smyda
authors.forename: Piotr
authors.initials: P
authors.lastname: Kedziorski
authors.forename: Miroslaw
authors.initials: M
authors.lastname: Maluszynski
authors.forename: Iwona
authors.initials: I
authors.lastname: Szarejko
mesh_terms: D054458:Amplified Fragment Length Polymorphism Analysis; D002874:Chromosome Mapping; D032461:Chromosomes, Plant; D018744:DNA, Plant; D017343:Genes, Plant / Q000235:genetics*; D001467:Hordeum / Q000235:genetics* / Q000254:growth & development*; D009154:Mutation / Q000235:genetics*; D018517:Plant Roots / Q000235:genetics* / Q000254:growth & development*; D030821:Plants, Genetically Modified / Q000235:genetics / Q000254:growth & development
chemical_list: D018744:DNA, Plant