The correlation coefficients for all pairwise comparisons of disease severity were high and highest between barley isolates and between rice isolates. Four QTL were detected, one on each of the following chromosomes 2, 8, 9 and 10. IR64 contributed resistance alleles at three of the QTL (chromosomes 2, 8 and 9). Azucena contributed the resistance allele at the QTL on chromosome 10 in response to inoculation with isolate THL142. The results of the QTL analysis support interpretation

of the phenotypic frequency distributions regarding the number of genes determining resistance to the four isolates in this population. Our results are novel in adding blast isolates from barley to the catalogue of pathogen specificities to which a gene, or genes, from IR64 confer resistance. “
“Sheath blight, caused by Rhizoctonia solani, is one of the most important rice diseases worldwide especially under irrigated agro-ecosystems. To date, no rice accession Selleckchem Lumacaftor with complete resistance to sheath blight has been reported. However, a number of genotypes with varying levels of resistance have been reported. Twelve genotypes (including mega varieties) viz. Tetep, Jasmine 85, Te-Qing, Duduruchi, Betichikon, Khatochalani, D-6766, D-256, Swarna, Sarju-52, MTU-1010 INK 128 cost and Samba Mashuri were evaluated for quantitative measurement of partial physiological resistance to sheath blight under controlled conditions using detached tiller method. Three independent

experiments, each involving three replications, were conducted. Seven days after inoculation, Phosphoprotein phosphatase the following disease variables were measured: number of lesions, lesion length, vertical sheath colonization (VSC) on the tiller, disease

severity, relative vertical sheath colonization (RVSC) and survival of the leaf blade. Variation between rice genotypes was observed for all the disease variables. Disease severity and VSC were the two most correlated variables, whereas the number of lesions and mean lesion length were the least correlated variables. The ranking of varieties often differed depending on the disease variable considered. Amongst the genotypes tested, D-256, Tetep and Jasmin-85 had the lowest number of lesions and disease severity. Similarly, Tetep and D-256 showed the lowest levels of RVSC, whilst Jasmine-85 was found to be intermediate. D-6766, Samba Mashuri and Betichikon showed the highest levels of disease variables. The fraction of dead leaves ranged from 0.00 to 0.38. No dead leaves were observed in Te-Qing, Swarna and MTU-1010. The highest fraction of dead leaves was observed for Betichikon (0.38) followed by Duduruchi and D-6766 (0.33). Our results suggest that this method in combination with other phenotyping methods could be used to quantify partial resistance to rice sheath blight. “
“The spreading of highly virulent isolates of Verticillium dahliae, causing Verticillium wilt of olive, is one of the most threatening concerns for olive cultivation.