EVALUATION OF SOME FLAX GENOTYPES FOR POWDERY . MILDEW RESISTANCE UNDER GREENHOUSE AND FIELD CONDITIONS | ||
| Journal of Plant Production | ||
| Article 8, Volume 27, Issue 11, November 2002, Pages 7323-7333 PDF (10.64 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2002.257031 | ||
| Authors | ||
| A. A. Aly,1; H. H. EI-Sweify2; M. T. M. Mansour2 | ||
| 1Plant Pathology Research Institute, Agriculture, Res. Center, Giza, Egypt. | ||
| 2Field Crops Research Institute, Agricultural Research Center, Giza, Egypt. | ||
| Abstract | ||
| A two-year greenhouse and field study was conducted at Giza and EI-Kanater Agricultural Research Stations to (1) estimate heritability of powdery mildew resistance when disease incidence and disease severity were used as criteria to evaluate resistance, (2) assess resistance to powdery mildew of 19 flax genotypes, and (3) quantify the relationship between disease intensity ratings and agronomic traits. Genotype component of variance of disease incidence was highly significant (p ~ 0.01) in two tests, while that of disease severity was highly Significant (P ~ 0.01) in one test and significant (P ~ 0.05) in two tests. In addition, the highly significant and the significant genotype components of variance of disease incidence and disease severity were associated with high heritability and with high genetic advance expected from selection. Significant differences in the disease level occurred between the 19 genotypes; however, some of these differences were inconsistent from one test to another, which may indicate the occurrence of genotype x environment interaction. Most of the tested genotypes did not have satisfactory levels of powdery mildew resistance. Moreover, the powdery mildew resistance, which was expressed by few of the genotypes, was environmentally sensitive. Most of the significant correlation coefficients between disease intensity variables and agronomic traits were negative, which implies that selection for powdery mildew resistance would necessarily lead to an lmprovement in agronomic traits and vice versa. | ||
|
Statistics Article View: 59 PDF Download: 237 |
||
