Assessing the Resistance of Red Raspberry (Rubus idaeus L.) Genotypes to Phytophthora fragariae var. rubi in Hydroponic Culture
| Autor: | Jeremy Pattison, W.F. Wilcox, Courtney A. Weber |
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| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | HortScience. 39:1553-1556 |
| ISSN: | 2327-9834 0018-5345 |
| DOI: | 10.21273/hortsci.39.7.1553 |
| Popis: | A hydroponic method was developed and tested for screening red raspberry geno- types for resistance to Phytophthora fragariae var. rubi, the most common causal agent of Phytophthora root rot in raspberry. Plants of 'Titan' and 'Encore' exhibited typical disease symptoms, with the latter developing signifi cantly smaller stem lesions and fewer petiole lesions. The resistant cultivar, 'Latham', regenerated healthy root tissue from the crown and older-order roots after initial infection and necrosis of young roots and exhibited no other symptoms beyond minor leaf chlorosis. This component of the resistance reaction has not been documented previously. A segregating F 1 population from the cross of 'Latham' × 'Titan' had a survival rate of 56% with 42% classifi ed as resistant, exhibited minimal symptoms, and produced varying amounts of healthy root tissue. This screening method allows multiple observations of all plant tissues, including roots, under repeatable and defi nable growth chamber conditions. It should be useful for classifying the phenotype of individuals in segregating red raspberry populations to investigate the inheritance of Phytophthora root rot resistance using molecular markers. Phytophthora root rot is a severe disease of red raspberry (Rubus idaeus L.) in nearly all |
| Databáze: | OpenAIRE |
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