Using X-ray photography and flow cytometry, the internal morphology and DNA replication activity of wild type (wt), GA- (gib-1) and ABA-deficient (sitw) tomato (Lycopersicon esculentumMill. cv. Moneymaker) mutant seeds were studied. During seed formation, from 30 to 45 d after pollination (DAP) the endosperm becomes solid and the seed starts to gain desiccation tolerance. At this time significant changes occur in the amounts of DNA in radicle tip cells. At 30 DAP, radicle tip cells of the three genotypes manifest about 60% of 2C, 30% of 4C and ...
