The current study was conducted to obtain more information on the specificity and variation of the volatile compounds, which are released from the root system of different lines and hybrids of Zea mays. European (12 genotypes – 3 of them are originated from Slovenian maize gene bank) and North American (5 genotypes) genetic material was included (15 maize hybrids and 2 maize inbreds). The results of our study have shown that roots of European and American maize genotypes secrete different relative amounts of linalool, α-caryophyllene and ß-caryophyllene, which depend on genotype and on the pretreatment of the roots (various mechanical damages).
COBISS.SI-ID: 7008121
The maize gene bank at the Agronomy Department of the Biotechnical Faculty in Ljubljana is one of the oldest and the most comprehensive plant gene banks in Slovenia. The first maize populations were collected in early 1950s. Presently, in our gene bank, there are 587 maize genotypes. Most of the materials represent domestic flint landraces of maize and selected inbreds with different levels of homozygosity. The main objective of our activity is preservation and maintenance of the acessions. The moisture of the stored material (kernels) is 8 % and the storage temperature is 4-6 °C. In order to maintain viability and sufficient amount of seeds, we are permanently multiplying genotypes in our breeding nursery, based on hand isolation and pollination. At the same time, we are also characterising and evaluation the materials according to the IPGRI descriptors. Evaluation of these traits is taking place every year. For the stored gene bank materials it is also important to have data about agronomic and breeding traits, such as yield, kernel quality, and resistance against diseases and pests. Results indicate that our accessions may represent a very useful genetic material for further breeding as well as for direct use.
COBISS.SI-ID: 7400057
The aim of our investigation was to determine general (GCA) and specific (SCA) combining ability of 15 maize inbreds and evaluate their F1 hybrids, maintained in maize gene bank of the Biotechnical Faculty in Ljubljana. Fifty new F1 hybrids were developed by using the scheme of incomplet diallel and involved 15 inbreds (P1–P10 as female parents and P12–P16 as male parents). The field trial was conducted on the experimental station of the Biotechnical Faculty at Jable near Ljubljana in 2010 based on randomized complete blocks and 3 replications. For all investigated traits significant differences were estimated for GCA and SCA. The male parent P16 had the highest GCA for yield, ear diameter and number of kernel rows; while the female parent P10 for yield and ear length. P2 had the highest GCA for ear diameter, and P13 for ear length. The hybrids P2×P12 and P1×P15 had the highest SCA for yield. The hybrids with the highest yield were on the 5th and on the 7th place regarding SCA for yield. Some of the hyibrids with good SCA for ear length and ear diameter also had a good SCA for yield.
COBISS.SI-ID: 7424633
The aim of our investigation was to determine tolerance of some new Lj- maize hybrids to Fusarium subglutinans (FS). Fifty new F1 hybrids were developed by using the scheme of incomplete diallel on the Biotechnical Faculty in Ljubljana. The field trial was conducted on the experimental station of the Biotechnical Faculty at Jable near Ljubljana in 2011 and 2012. The artificial inoculation by the fungus took place in the middle 5 randomly chosen ears, on each plot, 7-10 days after pollination. In both years, significant differences in tolerance to FS were determined for hybrids and for general combining ability (GCA) of female lines. Regarding testers (male parents) significant differences in GCA were determined only in 2012, while significant differences for specific combining ability (SCA) were established only in 2011. In our investigation some inbreds showed different response to the existing growing conditions in association with the scored tolerance to FS.
COBISS.SI-ID: 7424889
In the laboratory experiment we tested the compatibility of four strains of entomopathogenic nematodes Steinernema feltiae, S. carpocapsae and Heterorhabditis downesi to 15 chemical fungicides. The effect of direct IJs exposure to fungicides for 24, 48 and 72 hours was tested in Petri dish experiment at 15, 20 and 25 ºC. Our experiment showed the compatibility of S. feltiae with fungicide Quadris (a.i. azoxystrobin), on the other hand we concluded the compatibility of S. carpocapsae (strain C67) with all fungicides tested in the experiment, without the exception Falcon (a. i. tebukonazol and spiroksamin), Dithane (a. i. mancozeb), Sabithane (a. i. dinokap) and Ridomil (a. i. copper oxichlorid and metalaksyl-M). With EPN species H. downesi (strain 3173) we found the significantly highest mortality of infective juveniles with fungicide Falcon (a. i. tebukonazol and spiroksamin).
COBISS.SI-ID: 7069049