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Recovery of the Recurrent Parent Phenotype During Backcrossing in Soybeans 1
Author(s) -
Wilcox J. R.,
Probst A. H.,
Athow K. L.,
Laviolette F. A.
Publication year - 1971
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/cropsci1971.0011183x001100040012x
Subject(s) - backcrossing , biology , phytophthora megasperma , phenotype , glycine , agronomy , horticulture , botany , genetics , gene , elicitor , amino acid
Soybean [ Glycine max (L.) Merr.] lines resistant and susceptible to Phytophthora megasperma Drechs. var. sojae A. A. Hildeb., selected in successive backcross generations, were evaluated for maturity, height, lodging, seed size, yield, and oil and protein content. Recovery of the phenotype of the recurrent parent was generally slower than predicted, assuming only additive genetic control of agronomic characteristics. Deviations from predicted performance were probably due to continued segregation for genes controlling the expression of these characteristics and the limited sample (4 to 8 lines) used to evaulate each generation. Resistant selections were 3 to 6 cm taller and lodged more than susceptible selections. The shorter plant height of susceptible selections may be due to insidious infection. The increase in lodging of resistant selections may be a reflection of increased plant height or vigor due to resistance. Implications of these results on backcross breeding of soybeans are discussed.