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

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by McBlain, B. A. Articles by Schmitthenner, A. F. Search for Related Content PubMed Articles by McBlain, B. A. Articles by Schmitthenner, A. F. Agricola Articles by McBlain, B. A. Articles by Schmitthenner, A. F.

Tolerance to Phytophthora Rot in Soybean: II. Evaluation of Three Tolerance Screening Methods

Dep. of Agronomy Pathology, Ohio Agric. Res. and Development Ctr., the Ohio State Univ., Wooster, OH 4469
6426 Chippewa Rd., Orrville, OH 44667
Dep. of Plant Pathology, Ohio Agric. Res. and Development Ctr., the Ohio State Univ., Wooster, OH 44691

^* Corresponding author.

Five screening methods for tolerance to Phytophthora megasperma f. sp. g1ycinea (Drechs.) T. Kuan & D.C. Erwin (Pmg) in soybean [Glycine max (L.) Merr.] have been published. This study compares three of these methods. The 45 soybean strains used were reported susceptible to Race 4 of Pmg. Field tests were grown in 1985 and 1986 near Vickery, OH, on Fulton silty-clay (fine, illitic, mesic Aeric Ochraqualt) known to be infested with Race 4 and other races of Pmg. Inoculum-layer and slant-board tests were conducted in a greenhouse and growth chamber, respectively, in 1986 and 1987. Height and maturity data were obtained from replicated yield tests with low Pmg pressure. The inoculum-layer test gives tolerant lines high scores, whereas the slant board and field tests give low values to tolerant lines. The inoculum-layer and slant board data correlated well (r = -0.77, P < 0.01) but neither correlated as well with the field data (r = -0.41, P < 0.05; and r = 0.49, P < 0.01, respectively). Field tolerance scores were correlated with maturity (r 0.46, P < 0.01); however, the field scores of the 15 latest maturing strains were not correlated with maturity and correlated well with the inoculum-layer and slant board scores (r = -0.74, P < 0.01; and r = 0.76, P < 0.01, respectively). Apparently, field scores must be taken prior to onset of pod yellowing (R7). Both laboratory methods are suitable substitutes for the field test, but they evaluate seedling tolerance only. The inoculum-layer method is easier, less expensive, and allows both root rot ratings and tolerance scores based on shoot growth.

Received for publication May 7, 1990.

This article has been cited by other articles:

				T. C. Helms, B. J. Werk, B. D. Nelson, and E. Deckard Soybean Tolerance to Water-Saturated Soil and Role of Resistance to Phytophthora sojae Crop Sci., November 7, 2007; 47(6): 2295 - 2302. [Abstract] [Full Text] [PDF]

				C. R. Ferro, C. B. Hill, M. R. Miles, and G. L. Hartman Evaluation of Soybean Cultivars with the Rps1k Gene for Partial Resistance or Field Tolerance to Phytophthora sojae Crop Sci., October 2, 2006; 46(6): 2427 - 2436. [Abstract] [Full Text] [PDF]

				K. D. Burnham, A. E. Dorrance, T. T. VanToai, and S. K. St. Martin Quantitative Trait Loci for Partial Resistance to Phytophthora sojae in Soybean Crop Sci., September 1, 2003; 43(5): 1610 - 1617. [Abstract] [Full Text] [PDF]