Premium
Adjusting the Phenology of Determinate Soybean Segregants Grown at High Latitude
Author(s) -
Saindon G.,
Voldeng H. D.,
Beversdorf W. D.
Publication year - 1990
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/cropsci1990.0011183x003000030007x
Subject(s) - biology , phenology , indeterminate growth , indeterminate , locus (genetics) , horticulture , allele , botany , cultivar , genotype , growing season , genetics , gene , ideotype , mathematics , pure mathematics
Breeding for determinate ( dt 1 ) cnltivars has been proposed as a way of reducing lodging in soybean [ Glycine max (L.) Merr.]. However, determinate lines having maturity, acceptable for high latitude areas often exhibit insufficient plant height. The possibility of obtaining early‐maturing, nondwarf determinate soybean ptaats by using a combination of alleles at loci controlling stem termination and maturity was explored. Progeny test data for the E 1 maturity locus of six experimental lines indicated that the indeterminate Evans‐e 3 , Harosoy‐e 3 , X2403 (Evans‐e 3 e 4 ), and X2396 (Harosoy‐e 3 e 4 ) homozygous for e 1 , whereas the determinate PI 317334A and PI 445831 are homozygous for E 1 . PI 445831 and PI 317334A (both homozygous for e 3 e 4 ) wereach crossed to Evans‐e 3 real Harosoy‐e 3 (both homozygous for e 3 E 4 ) and to X2403 and X2396 (both homozygous for e 3 e 4 ). Days to RI and R7 stages, recorded in eight populations of F 2 plants grown in the field at Ottawa (45° 25′ N, 75° 42′ W), revealed that phenotypes were generated across a large array of maturities in populations where the E 1 and E 4 loci jointly segregated. The E l and E 4 loci did not act ndditively on flowering and maturity in plants homozygous for e 3 . As a result of this nonadditive effect, early‐maturing determinate phenotypes adapted to the short growing season of the latitude were isolated in populations derived from PI 317334A. These genotypes were not dwarf and their putative genotype is E 1 E 1 e 3 e 3 e 4 e 4 dt 1 dt 1 .