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Heritability of Resistance to Leaf Spot Caused by Septoria spraguei in Russian Wildrye

USDA-ARS, Northern Great Plains Res. Lab., P.O. Box 459, Mandan, ND 58554

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A leaf-spot disease of Russian wildrye [Psathyrostachys juncea (Fischer) Nevski] caused by Septoria spraguei Uecker & J.M. Krupinsky has the potential to reduce forage quality and yield, particularly in subhumid portions of the northern Great Plains region of the USA and Canada. This study was conducted to estimate heritability of resistance to S. spraguei and to measure the correlation between disease ratings in greenhouse and field environments. Twenty-five parent clones and their respective half-sib families were inoculated with S. spraguei in a greenhouse environment and subjected to natural infection in a field nursery. In the greenhouse, narrow-sense heritability (h²) estimates from the regression of half-sib family means on parent means were 0.57, 0.79, and 0.72, respectively, for lesion number, lesion size, and percentage necrosis ratings on leaf blades. Heritability estimates in the field environment were 0.22, 0.57, and 0.36, respectively, for lesion number, lesion size, and percentage necrosis. Lesion size was the only rating for which the entry x year interaction was nonsignificant in the field for both parents and half-sib families. The Spearman rank correlation coefficient between greenhouse and field environments for lesion size means of half-sib families was 0.61**. Recurrent phenotypic selection for small lesion size among half-sib families inoculated with S. spraguei in a single greenhouse environment should be effective in improving resistance to this leaf-spot disease in Russian wildrye.

Received for publication June 23, 1994.

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