HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (8) Citing Articles via Google Scholar Google Scholar Articles by Díaz-Lago, J. E. Articles by Abadie, T. E. Search for Related Content PubMed Articles by Díaz-Lago, J. E. Articles by Abadie, T. E. Agricola Articles by Díaz-Lago, J. E. Articles by Abadie, T. E. Related Collections Crop Genetics

CROP BREEDING, GENETICS & CYTOLOGY

Recurrent Selection for Partial Resistance to Crown Rust in Oat

^a INIA La Estanzuela, CC 39173, 70000 Colonia, Uruguay
^b Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108
^c Universidad de la República, Garzón 780, 12900 Montevideo, Uruguay

* Corresponding author (jdiaz{at}inia.org.uy)

Crown rust (caused by the fungus Puccinia coronata Cda. f. sp. avenae Eriks.) is a major disease of cultivated oat (Avena sativa L.). Partial resistance is a form of incomplete resistance characterized by a reduced rate of epidemic development and is potentially more durable than complete race-specific resistance. Four rapid cycles of selection for partial crown rust resistance were conducted in an oat recurrent selection population after the completion of the seventh cycle of selection for grain yield. The objectives of this research were to: (i) determine the effectiveness of rapid cycle recurrent selection for partial crown rust resistance; (ii) assess the indirect effect on grain yield, flowering date, and plant height; and (iii) estimate phenotypic and genetic correlations between traits and broad-sense heritabilities. Recurrent selection parents and check cultivars were evaluated in six environments. Four cycles of selection for partial resistance reduced the area under the disease progress curve (AUDPC) 42%. This increased resistance was not reflected in higher grain yields under moderate crown rust epidemics, but it produced a 4.7% grain yield gain per cycle in an environment with a severe rust infection. Selection for partial resistance indirectly delayed the flowering date by 2 d. Entry mean broad-sense heritability estimates were intermediate (41–64%) for AUDPC. Our results show the usefulness of rapid cycle recurrent selection as a population improvement procedure capable of effectively increasing the level of partial resistance to crown rust in a high-yielding oat population.

This article has been cited by other articles:

				T. S. Rani and R. L. Ravikumar Genetic Enhancement of Resistance to Alternaria Leaf Blight in Sunflower through Cyclic Gametophytic and Sporophytic Selections Crop Sci., March 1, 2007; 47(2): 529 - 534. [Abstract] [Full Text] [PDF]

				J. Long, J. B. Holland, G. P. Munkvold, and J.-L. Jannink Responses to Selection for Partial Resistance to Crown Rust in Oat Crop Sci., April 25, 2006; 46(3): 1260 - 1265. [Abstract] [Full Text] [PDF]