Early varieties of soybean have been found to be less sensitive to photo-periods than late varieties (Johnson et al., 1960). Therefore, it was postulated that some of the early strains of soybean may have no photoperiod requirement and accordingly screening for insensitivity to photoperiod was car-ried out in 498 early lines of soybean. These germplasm lines were evaluated for days to flowering and several morphological traits under two different seasons, viz., rainy season, 1978, and spring/summer season, 1979.
Ram, Hari Har; Singh, Kamendra; Pushpendra; and Verma, V. D.
"Research Notes : Screening for photoperiod insensitivity under natural conditions
Soybean Genetics Newsletter: Vol. 9
, Article 18.
Available at: http://lib.dr.iastate.edu/soybeangenetics/vol9/iss1/18