Hu (1968) made several hundred reciprocal crosses between diploids and tetraploids of several different soybean cultivars, but failed to produce putative autotriploid seeds.
The soybean hypertriploid in our study showed a similar frequency of pollen fertility (63%) to the male-fertile autotriploid (Ms1ms1ms1) plants (57-82%) reported by Chen and Palmer (1985).
Although autotriploids in soybean have not been produced from crosses between autotetraploids and diploids, a large number of triploid plants have been isolated from the progeny of different lines of homozygous recessive male-sterile (ms1ms1) soybean (Kenworthy et al.
Chen and Palmer (1985) analyzed meiotic pairings in the autotriploids (2n = 3x = 60) derived from the genetic male-sterile (ms1ms1) soybean.
The autotriploids generally had poor seed set from self-pollination even though they may have high pollen fertility such as in barley (Tsuchiya, 1952), jimson weed (Datura stramonium L.
This result was similar to that of the selfed progenies from Ms1ms1ms1 autotriploids (Chen and Palmer, 1985).