A review of chemically induced flowering in Lemna gibba G3 and Pistia stratiotes [aquatic weeds]
1982
Pieterse, A.H. (Koninklijk Inst. voor de Tropen, Amsterdam (Netherlands))
The synthetic chelating agent EDDHA (ethylenediamine-di-o-hydroxyphenylacetic acid) and salicylic acid (SA) induce or enhance flowering in Lemna gibba L., strain G3, and Pistia stratiotes L. In L. gibba G3 these compounds also induce gibbosity, a swelling of the lower side of the fronds. EDTA (ethylenediaminetetracetic acid) brings about similar effects in L. gibba G3. However, it is markedly less effective than EDDHA and SA and there are strong arguments in favour of a recent conclusion that it brings about its effect via a different mechanism. Ethylene induces gibbosity in L. gibba G3, however, neither in this species nor in P. stratiotes does it affect flowering. The effect of EDDHA/SA as well as ethylene on L. gibba G3 is specifically negated by autoclaved gibberellic acid (GA(,3)), i.e., break-down products of GA(,3) such as allogibberic acid, whereas non-autoclaved GA(,3) is in effective. On the other hand GA(,3) induces profuse flowering in P. stratiotes whereas autoclaved GA(,3) is less effective. In the light of the various results it could be hypothesized that a gibberellin and ethylene in combination with another factor are involved in flowering of L. gibba G3.
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