Showing papers on "Lygodium published in 1960"
TL;DR: It is demonstrated that prothalli of L. japonicum elaborate, and secrete into the medium, a substance which controls formation of antheridia in this fern species, and that the Lygodium factor is also chemically distinct from the substance that controls antheridium formation in A. phyll.
Abstract: SummaryIt is demonstrated that prothalli of L. japonicum elaborate, and secrete into the medium, a substance which controls formation of antheridia in this fern species. The antheridium-inducing activity of the medium is stable to boiling for 10 min at both pH 2 and 12. It is adsorbed on charcoal and destroyed by ashing. The results are considered to show that this antheridium-inducing substance differs from the substance which controls the same developmental event in many species of the fern family Polypodiaceae. The results further indicate that the Lygodium factor is also chemically distinct from the substance that controls antheridium formation in A. phyll∗∗∗itidis which, like L. ∗∗∗japonicum, belongs to the fern family Schizaeacea∗∗∗. The individuals that first attain the reproductive phase in a gametophyte population of L. japonicum give rise to one or 2 archegonia before the first antheridium initial appears. This sequence of sex-organ formation is reversed in the prothalli which subsequently attai...
37 citations