Thursday, 9 October 2008: 9:15 AM

George R. Brown Convention Center, 371C

Elroy Cober, Bldg. 110, CANADA, Dept. of Agriculture, AAFC-ECORC, 960 Carling Ave., Ottawa, ON K1A 0C6, CANADA

The long juvenile (LJ) trait results in delayed soybean [Glycine max (L.) Merr.] flowering under short days. The J and E6 locus control LJ flowering responses. Most work with J and E6 has been undertaken in 13 to 14 photoperiods. This work was carried out to characterize LJ line responses to a greater range of photoperiods, and to characterize the genetic control of LJ. A comparison of Parana (E6) and its spontaneous mutant LJ isoline Paranagoiana (e6) showed similar flowering times at both 4 and 16 h photoperiods, while differences were maximized under 8 to 12 h photoperiods. Both LJ genotypes, e6e6 and jj, flowered similarly under 6 and 12 h photoperiods. During introgression of the LJ trait from Paranagoiana to a MG 0 Harosoy isoline, late maturity was confirmed to be a recessive trait and seemed to be controlled by two genes. The BC1- and BC2-F2 populations were shifted toward early flowering while maintaining some lines flowering 18 d later than the recurrent parent under a 12 h photoperiod.

See more of: Genetic Improvement of Soybean, Common Bean, and Legumes
See more of: C01 Crop Breeding & Genetics

2008 Joint Annual Meeting (5-9 Oct. 2008): Flowering Time Response of Long Juvenile Soybean under Extreme Photoperiods.

780-5 Flowering Time Response of Long Juvenile Soybean under Extreme Photoperiods.