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Reaction of Reed Canarygrass Genotypes to the Leafspot Pathogens Stagonospora foliicola and Helminthosporium catenarium 1
Author(s) -
Zeiders K. E.,
Sherwood R. T.
Publication year - 1977
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1977.0011183x001700040044x
Subject(s) - biology , phalaris arundinacea , lesion , plant disease resistance , inoculation , cultivar , genotype , veterinary medicine , poaceae , botany , agronomy , horticulture , ecology , genetics , medicine , psychology , psychiatry , wetland , gene
Our objectives were to determine the range of reactions to tawny blotch (caused by Stagonospora foliicola (Bres.) Bubak) and Helminthosporium leafspot (caused by H. cateranium Drechs.) among diverse genotypes of reed canarygrass ( Phalaris arundinacea L.), to assess the relationships among lesion size, lesion frequency, leaf size, and tawny blotch severity ratings, and to assess the feasibility of selecting for resistance as a means of improving this highly productive forage species. The 24 clones varied from resistant to highly susceptible to S. foliicola or H. catenarium in artificial inoculations. Differences among disease severity means for both pathogens were significant at P < 0.01. Resistance to S. foliicola was controlled independently from resistance to H. catenarium . One clone was resistant to both pathogens. There was a wider range of reaction among clones to S. foliicola than to H. catenarium . Differences in lesions per leaf, lesions per cm 2 , and lesion size rating for S. foliicola were significant at P < 0.01. There was a significant negative correlation (r = −0.60) between leaf area and lesions per cm 2 . Lesions per leaf and lesion size were correlated (P < 0.01) with disease severity ratings (r = 0.69), thus supporting the validity of our disease severity evaluations. The results indicate that the prospects for developing lines with resistance to either or both pathogens are good.