Analyzed in this paper were the in vitro effects of drought stress in 13 genotypes of winter wheat, one genotype of spring wheat, and three Triticale genotypes of different geographic origin. Callus tissue was induced from immature zygotic embryos (10-15 days after pollination) on a modified MS nutrient medium. After two weeks, callus tissue was transplanted onto the same medium enriched with 5% high-molecular polyethylene glycol (PEG 6000), which was used as the stress agent to produce the effect of drought chemically. A control group of calluses was grown on an identical medium but without PEG. After four weeks of growing calluses on these mediums, we assessed callus mass survival ability of the genotypes before the transplantation as well as percentage reduction of callus fresh weight after the transplantation onto the nutrient medium with 5% PEG. Statistically significant differences were found among the genotypes in their response to the induced stress. The best survival ability before the transplantation was found in the genotype Mexicol20 (83%), while the lowest was recorded in Slavija (11.3%). Culture growing under stress conditions significantly reduced callus fresh weight in all of the genotypes. The lowest decrease of the callus mass relative to control was recorded in Rozofskaja (14.4%) and the highest in Miranovska (58.4%), indicating the genotypes' tolerance levels towards drought stress
This study was conducted to determine the size and spatial distribution of mycelial individuals of Marasmius rotula at one locality on Mt. Stara planina in the Republic of Serbia. Total of 12 sporocarps were collected from investigated locality (Vidlič, Stara planina). Sporocarps were distributed in four groups and distances between them were approximately 10-30 meters. Genomic DNA was extracted from each sporocarp and used for inter-simple sequence repeat (ISSR) polymorphism analysis using (GTG) 5 and (GACA) 4 primers. Both primers showed reproducible band patterns on agarose gels and sporocarps with identical band patterns were considered to belong to the same individual (genet) and were grouped accordingly. Grouping with both primers determined that 12 analyzed sporocarps belong to 4 distinct genets (A, B, C, D). Approximate genet diameters were 2 m for two genets (A, B) and 15 m for one genet (C) while diameter of one genet (D) was not possible to determine since it was represented only by one sporocarp. The results presented here are the first data about size and spatial distribution of genets of M. rotula. To determine whether the obtained genet sizes are general trait of an analyzed species or a special trait appeared as an effect of environmental conditions, more information on the genet distribution of other M. rotula populations is needed.
As a contribution to DUS testing within the system of protection of plant breeders' rights (PBR), the AFLP molecular system has been used in this study to produce DNA fingerprinting profiles. DNA polymorphism and genetic distance of nine agronomicaly important maize genotypes has been investigated using the AFLP technique. Two specific adapters, two preselective primers and twenty selective primers were utilized for DNA amplification. The selective primers were GC rich, each having a 3-mer selective sequence at 3' termini. Ten double stranded primer combinations were made out of the twenty primers but only five of them turned out to be reliable. Out of 253 amplified DNA fragments, 177 were polymorphic (70%). The CGA/GAG (B) primer combination has proved to be the most polymorphic (44 polymorphic fragments have been recorded) revealing the polymorphism rate of 81.5%. Genotypes g1 and g7 were most distinct (GD=55% and GD=79%, respectively) and genotypes g1. g4 and g8 were closest (GD=55% in all cases). The paper discusses possible uses of AFLP DNA profiling technique to achieve a unique fingerprinting pattern of agronomicaly important maize genotypes
The objective of this paper was to examine the functionality of two microsatellite primers as their polymorphism levels were determined for select Novi Sad wheat genotypes. Chosen as representatives of Gater-sleben wheat microsatellites (GWM) were two sets of microsatellite primers, GWM 165 and GWM539, which had been described according to RODER et al. (1998a; 1998b). Twenty five wheat genotypes from the World Collection of the Institute of Field and Vegetable Crops in Novi Sad were used in the study. Genomic DNA was isolated from the plant materials using a modification of the PLASCHKE et al. (1995) method. PCR amplification of the desired fragments was carried out in a volume of 30 ul (Eppendorf thermocycler) according to RODER et al. (1998b). The PAGE conditions were implemented according to GALOV1Ć et al. (2004). The GWM539 set, with six different alleles, showed a higher level of polymorphism than GWM165, in which three different alleles were detected for the locus concerned
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