Czech Journal of Genetics and Plant Breeding, 2020 (vol. 56), issue 3
Wheat leaf rust (Puccinia triticina Eriks.) virulence frequency and detection of resistance genes in wheat cultivars registered in the Czech Republic in 2016-2018Original Paper
Alena Hanzalová, Veronika Dumalasová, Ondřej Zelba
Czech J. Genet. Plant Breed., 2020, 56(3):87-92 | DOI: 10.17221/86/2019-CJGPB 
In 2016-2018 virulence of the Czech wheat leaf rust population was studied on Thatcher near-isogenic lines, carrying different Lr genes, and 130 leaf rust isolates. Virulence to Lr9 was found only sporadically. Virulence frequency to Lr2a, Lr2b, Lr2c and Lr28 was lower than in previous years. All tested isolates were avirulent to Lr19. Lr24 conditioned resistance to majority of isolates. Nineteen recently registered Czech cultivars were tested with six isolates of the pathogen and Lr genes were postulated. Presence of genes Lr1, Lr10, Lr19, Lr24,...
Study of pathogenicity and genetic diversity of Magnaporthe oryzae isolated from rice hybrid Wuyou 308 and detection of resistance genesOriginal Paper
Bo Lan, Ying-Qing Yang, Qiang Sun, Hong-Fan Chen, Jian Chen, Yong-Hui Huang, Guang-Hua Huo, Xiang-Min Li
Czech J. Genet. Plant Breed., 2020, 56(3):93-101 | DOI: 10.17221/64/2019-CJGPB
To understand the cause of loss of rice blast resistance, we studied the pathogenicity of Magnaporthe oryzae strains isolated from rice hybrid Wuyou 308 and evaluated its resistance genes. A total of 62 M. oryzae strains were isolated and tested in 7 Chinese rice varieties with varying degrees of resistance to rice blast and 30 blast-resistant monogenic lines. Fourteen physiological races of M. oryzae were identified: 8.55% belonging to the ZA group, 86.67% to the ZB group, and 5.00% to the ZC group. ZB15 was the most abundant race (45.00%). Five resistance genes, Pi-3(1), Pi-z5, Pi-k, Pi-kp(C),...
Grain hardness in triticale: a physical and molecular evaluationOriginal Paper
Veronika Kselíková, Tomáš Vyhnánek, Pavel Hanáček, Petr Martinek
Czech J. Genet. Plant Breed., 2020, 56(3):102-110 | DOI: 10.17221/96/2019-CJGPB
Grain hardness is an important quality trait of cereals. In the present work, the particle size index (PSI) was used to assess the variability in grain hardness of thirteen triticale genotypes, three wheat genotypes and one rye genotype grown in two subsequent seasons. The PSI values of the triticale samples ranged between 7.7 to 19.2%, representing a medium hard to a very hard grain. Moreover, the sequencing of genes in the Hardness (Ha) locus revealed a limited genetic variability in the grain hardness genes, namely secaloindoline-a (Sina) and secaloindoline-b (Sinb). Two possible new allelic variants were identified,...
The pod shattering resistance of soybean lines based on the shattering incidence and severityOriginal Paper
Ayda Krisnawati, Andy Soegianto, Budi Waluyo, Kuswanto
Czech J. Genet. Plant Breed., 2020, 56(3):111-122 | DOI: 10.17221/20/2020-CJGPB
The study is aimed at evaluating the pod shattering resistance of F8 soybean lines based on the shattering incidence and shattering severity. The materials consist of fourteen F8 soybean lines and two check cultivars. The pod shattering incidence was examined by using the oven-dry method, meanwhile, the shattering severity was evaluated based on the severity of the pod opening. The pod shattering resistance based on the shattering incidence resulted in five resistant lines (7-10% shattering), seven moderate lines (13-23% shattering), one susceptible line (53% shattering), and one very susceptible line (100% shattering). The pod...
Impact of parent inbred lines on heterosis expression for agronomic characteristics in sunflowerOriginal Paper
Assadollah Zakeri Haddadan, Mehdi Ghaffari, Eslam Majidi Hervan, Bahram Alizadeh
Czech J. Genet. Plant Breed., 2020, 56(3):123-132 | DOI: 10.17221/100/2019-CJGPB
To study the impact of parent-inbred lines on the heterosis expression of the agronomic characteristics in sunflower hybrids, 24 sunflower hybrids along with the parent lines were evaluated for their agronomic characteristics as a randomised complete block design with three replications in the 2018-2019 growing seasons in Karaj, Iran. According to the results, the hybrids R29 × A346, R19 × A346, R29 × A40 had the highest achene yield (4 159, 4 143 and 4 108 kg/ha, respectively), but the highest heterosis was observed in R29 × A212 and R19 × A212 (182 and 181%, respectively) suggesting that the incidence of heterosis is related to the relative performance...