Authors:I. Karsai, K. Mészáros, L. Láng, and Z. Bedő
Tillering ability is a complex trait, the development of which is influenced by both environmental factors and complex genetic regulation. In the present experiments this complex regulation was dissected into its various components in an effort to separate the effect on tillering of major genes influencing ontogeny from that of other genomic factors. The tillering rate of a facultative × winter barley mapping population was examined in the field after autumn and spring sowing. The vernalisation sensitivity gene
exerted a considerable influence on tillering in spring-sown barley. In addition to the major genes, QTL analysis revealed two chromosome regions (1HS and 3HL) with a significant influence on the extent of tillering. Neither of these regions were involved in the regulation of heading date, and their effect on tillering was the most intense at the beginning of ontogeny, gradually declining as the influence of the
gene increased. The function of the
locus in the regulation of tillering is manifested partly through a direct effect on the transition from the vegetative to the generative phase and partly indirectly via epistatic regulation of other chromosome regions influencing tillering.
Authors:V. Psota, E. Lukšíčková, J. Ehrenbergerová, and J. Hartmann
The occurrence of damaged grains was studied in 12 barley genotypes in a three-year period. The occurrence of grains with physiological split of lemma and endosperm was generally low. Split of palea and endosperm was mostly affected by the genotype (10%) and it was recorded most frequently in the genotype Heris. Incomplete overlapping of husks was also markedly affected by the genotype (10%) and it occurred most frequently in the genotype Scarlett. Sprouted grains and grains of green color occurred minimally. Black points were affected by year (21%) and genotype (15%). This damage was most frequently reported for the genotypes Camera and Jersey. Surprisingly, the occurrence of grains with apparently moldy husks was markedly affected by the genotype (25%), less substantially by the location (10%) and minimally by year (3%).
Shtaya, M.J.Y., Sillero, J.C., Flath, K., Pickering, R., Rubiales, D. 2007. The resistance to leaf rust and powdery mildew of recombinant lines of barley ( Hordeumvulgare L.) derived from H-vulgare × H-bulbosum crosses. Plant Breed. 126 :259