Analysis of variation in agronomic characters and partial resistance to barley leaf rust (Puccinia hordei) pathotype ETPh7611 of barley landrace collections

Autor: B. J. K. Singh, Dawit T. Degefu, Kassahun Tesfaye, Allo A. Dido, M. S. R. Krishna
Rok vydání: 2021
Předmět:
Zdroj: European Journal of Plant Pathology. 162:131-148
ISSN: 1573-8469
0929-1873
Popis: The main germplasm resource bases used for genetic diversity in disease resistance include wild ancestral species, landraces and commercial varieties. In this study, 585 barley (Hordeum vulgare L.) landraces were evaluated along with 10 checks for resistance to leaf rust (P. hordei) pathotype ETPh7611 under field conditions at Sinana and Goba, Ethiopia, during 2018 and 2019 main cropping seasons. The trial was laid out in augmented design consisting of six blocks and each plot comprised a single row of 1.75 m long and 0.2 m spacing between rows. Data on disease incidence, severity and agronomic traits were recorded. The result showed highly significant variations among landraces for disease incidence, severity, and agronomic traits. The leaf rust incidence and AUDPC varied from 63.7 to 86.3 and 651.5 to 2096.4, respectively. Similarly, the variations among landraces in terms of regions of origin, altitude classes, and kernel row number were significant. Landraces originated from Arsi, Bale and Gonder had significantly lower disease incidence and severity than others. Furthermore, landraces collected from altitude class III (2000–2,500 m) and those with 2-row and irregular kernel type had lower disease severity. Segregation in infection type as well as partial resistance (PR) was observed in some landraces due to a reduction of disease severity and 33 landraces showing lowest disease severity were selected. The resistant landraces identified in the present investigation can be utilized to study the genetics of resistance to leaf rust resistance, which subsequently will help to incorporate the resistant genes into several elite backgrounds of barley.
Databáze: OpenAIRE
Externí odkaz: