Soybean plants homozygous for the male-sterile mutation ms4 are capable of seed production in the absence of insect pollinators (Graybosch and Palmer, 1984). Cytological investigations have demonstrated the genesis of pollen grains by male-sterile plants at a frequency of 3.3% (Graybosch and Palmer, 1985). Pollen formed is identical to that of male-fertile plants, and will germinate when placed in an in vitro germination medium.
Grayhosch, Robert and Palmer, Reid G.
"Research Notes : United States : Test for apomixis in ms4 soybean,"
Soybean Genetics Newsletter: Vol. 13
, Article 33.
Available at: https://lib.dr.iastate.edu/soybeangenetics/vol13/iss1/33