Description
Resistance to stem rust (caused by Puccinia graminis Pers.: Pers. subsp. graminicola Z. Urban.) would be beneficial in tall fescue (Festuca arundinacea Schreb.). Two cycles of polycross (PX) selection on progenies from thirty-four parent plants (14 forage-types and 20 turf-types) were compared to one cycle of open pollination (OP) followed by one cycle of PX selection using a 2-stage greenhouse screening process. Response from selection was determined from composite half-sib progenies from each cycle. Number of plants with resistant reaction based on pustule type increased from 5 to 54% in the PX forage-type population and from 6 to 50% in the PX turf-types. Overall response from initial OP selection was similar to PX selection, but 78 and 50% of the gain, respectively, occurred in the PX cycle. Results indicated that rapid progress from selection in the greenhouse for stem rust resistance in tall fescue is possible using PX selection.
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Direct Selection Response for Stem Rust Resistance in Tall Fescue
Resistance to stem rust (caused by Puccinia graminis Pers.: Pers. subsp. graminicola Z. Urban.) would be beneficial in tall fescue (Festuca arundinacea Schreb.). Two cycles of polycross (PX) selection on progenies from thirty-four parent plants (14 forage-types and 20 turf-types) were compared to one cycle of open pollination (OP) followed by one cycle of PX selection using a 2-stage greenhouse screening process. Response from selection was determined from composite half-sib progenies from each cycle. Number of plants with resistant reaction based on pustule type increased from 5 to 54% in the PX forage-type population and from 6 to 50% in the PX turf-types. Overall response from initial OP selection was similar to PX selection, but 78 and 50% of the gain, respectively, occurred in the PX cycle. Results indicated that rapid progress from selection in the greenhouse for stem rust resistance in tall fescue is possible using PX selection.
