Garden pea Varietal Susceptibility to Mycosphaerella pinodes and its Effect on Yield Components of Single Plants
The susceptibility of 21 garden pea genotypes to Mycosphaerella pinodes was evaluated in a two years study with inoculation under controlled conditions and in field experiments. The tested genotypes differed significantly in their susceptibility to seedling foot rot and leaf and stem blight caused by M. pinodes under these tests. Average scores of leaf infection in laboratory testing were higher comparing to the degree of infection in field conditions with inoculation. The genotypes which were rated susceptible to foliar infection were also susceptible to stem infection, with the severity of stem infection being much lower. No significant correlation was obtained between foliar symptoms severity and seedling foot rot necrotic index for garden pea genotypes. Deleterious effects of the inoculation with M. pinodes in field experiments on all yield components of pea plants parameters were observed. The pathogen caused 14.6% reduction of number of pods per plant, 17.3% reduction of number of seed per plant, 23.5% reduction of seed weight per plant and 7.8% decrease of 1000 seed weight in comparison with protected controls. There were also quite large differences between the years of testing as well as among pea genotypes in reduction of yield components. Genotypes Mieszko and Jurand showed the lowest reduction of seed weight per plant and appeared to be more tolerant to M. pinodes among the tested. Overall, five of tested genotypes (Kadona, ZIF 2401, Juko Nike and Deko) were considered as moderately susceptible. The remaining were either susceptible or highly susceptible (Cud Kelwedonu, Pionier, Markus, Kosynier, Duet and Hetman). The obtained results will be useful for breeders in selecting the components for a crossing programme.
A dozen specimens of Eumodicogryllus bordigalensis were found in three localities in Poland as well more than thirty foreign specimens of the species collected in southern Europe, the Caucasus and Mongolia. They are deposited in the collection of the Museum of Zoology PAS. The adult specimens were studied in detail and measured. The indigenous specimens and the majority of the foreign ones proved to be macropterous. The problems of wing polymorphism and the possibilities of migration are discussed.
The main purpose of this work was to analyse the morphological, phenological and agronomical variability among common bean local populations from The National Centre for Plant Genetic Resources, Polish Genebank, in order to know the relation among them, and to identify potentially useful accessions for future production and breeding. A considerable genotypic variation for number of seeds per plant, number of pods per plant and weight of seeds per plant were found. Studied bean accessions differed significantly in terms of thousand seeds weight (TSW) as well as severity of bacterial halo blight and anthracnose, the major bean diseases. The lowest genotypic diversity was found for the percentage of protein in the seeds, the length of the vegetation period and lodging. The cluster analysis allowed identification of five groups of bean accessions. Genotypes from the first cluster (POLPOD 98-77, KOS 002 and Raba cv.) and from the second cluster (WUKR 06-573a, KRA 4, WUKR 06-0534 together with Prosna cv.) are of the highest usefulness for breeding purposes. There was no grouping of local populations depending on region of origin.