Relationship between ineffective R‐ genes and expansion rate of lesions on potato leaves, caused by Phytophthora infestans

Autor:	Greg Forbes, B. R. Trognitz, M. E. Ordoñez
Rok vydání:	1998
Předmět:	biology Inoculation food and beverages Plant Science Quantitative genetics Horticulture biology.organism_classification Major gene Mycology Botany Phytophthora infestans Genetics Plant breeding Phycomycetes Agronomy and Crop Science Solanaceae
Zdroj:	Plant Pathology. 47:130-136
ISSN:	1365-3059 0032-0862
DOI:	10.1046/j.1365-3059.1998.00226.x
Popis:	Progenies from eight tetraploid potato crosses were assessed for the association between ineffective R-genes and lesion expansion rate (LER) in mm per day on detached leaves that had been inoculated with Phytophthora infestans. In two of the progenies, a significant association between ineffective R-genes and LER was measured, which could be an indication of residual effects. No association was found in the other progenies. These results and other corroborative evidence do not support an approach to plant breeding based on the stacking of R-genes to accumulate residual resistance effects. Using the same detached-leaf test, differences in aggressiveness between two isolates of P. infestans could be measured in all eight progenies. LER values were consistent with previously published ranges and were distributed continuously and unimodally in all progenies, suggesting that differences in relative aggressiveness of isolates were probably not affected by R-genes.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a63f15f9221e97069c44c718fe29571c https://doi.org/10.1046/j.1365-3059.1998.00226.x Zobrazit plný text záznamu Plný text