Premium
A New Soybean Maturity and Photoperiod‐Sensitivity Locus Linked to E1 and T
Author(s) -
Cober Elroy R.,
Voldeng Harvey D.
Publication year - 2001
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/cropsci2001.413698x
Subject(s) - biology , locus (genetics) , allele , epistasis , backcrossing , photoperiodism , population , genetics , horticulture , botany , gene , demography , sociology
An association between early maturity and tawny pubescence has been observed in short‐season soybean [ Glycine max (L.) Merr.]. The objectives of this study were to determine if a single locus controls early maturity; and if there is a new locus linked to E1 and T or, alternatively, a third allele at the E1 locus. A cross was made between ‘Harosoy’ isolines OT89‐5 ( e3e3 e4e4 ) and OT94‐47. PI 196529 was the donor of early maturity in the backcrossing program which developed OT94‐47. A total of 229 F 2 plants and the parents were grown under 20‐h photoperiods produced by incandescent lamps. OT94‐47 flowered in 43 ± 1.4 d, OT89‐5 flowered later in 57 ± 4.2 d, and the F 2 population fit a 3 late: 1 early flowering ratio. Early‐flowering F 2 plants produced F 3 families that flowered similarly to OT94‐47. Later‐flowering F 2 plants either segregated for flowering date or flowered similarly to OT89‐5. To test for allelism with E1 and linkage with T , a cross was made between OT93‐26 ( E1E1 e3e3 e4e4 TT ) and OT94‐47. F 2 plants were classified as parental types or intermediate and equivalent to OT89‐5 in maturity. Maturity and pubescence color were recorded in 376 F 3 progeny rows. The data did not fit a single locus model or a two loci dominant epistasis model (12:3:1). The E7 allele was partially, but not completely, dominant over the e7 allele. Therefore, a new locus E7 is proposed. Using the F 3 segregation data, linkage between T and E1 was estimated to be 1.3 ± 0.6 centimorgan (cM). Linkage between E1 and E7 was estimated to be 6.2 cM and linkage between E7 and T was estimated to be 3.9 cM. E7 is a new flowering, maturity, and photoperiod sensitivity locus tightly linked to both E1 and T E7E7 results in later flowering and maturity, and sensitivity to long photoperiods produced by incandescent lamps when compared to e7e7