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Breeding Low‐Tannin Sericea. I. Selecting for Resistance to Rhizoctonia Sp. 1
Author(s) -
Donnelly E. D.
Publication year - 1983
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/cropsci1983.0011183x002300010005x
Subject(s) - tannin , biology , condensed tannin , cultivar , rhizoctonia , botany , lespedeza , horticulture , agronomy , proanthocyanidin , biochemistry , polyphenol , rhizoctonia solani , antioxidant
A severe epiphytotic of a foliar disease caused by Rhizoctonia sp. occurred in nursery plants of sericea lespedeza [ Lespedeza cuneata (Dumont) G. Don], in a breeding program to develop a low‐tannin cultivar. From approximately 6,000 low‐tannin nursery plants, 82 were selected that were free from disease symptoms. Most S 1 progenies of these plants proved to be susceptible in a field test; however, some appeared highly resistant. There was a close association in reaction of low‐tannin lines to the fungus between 2 years. Tannin content of low‐tannin lines was correlated with disease severity: as tannin decreased, disease severity increased. However, results indicated that tannin in low‐tannin lines accounted for only 18% of the variation in disease severity. The remaining 82% apparently was caused by one or more genes for resistance other than the one major gene for tannin. No disease was observed on high‐tannin lines. The high‐tannin control cultivar had twice the tannin content as the mean of low‐tannin lines.