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Research Journal of Botany
Year: 2009  |  Volume: 4  |  Issue: 1  |  Page No.: 29 - 39

Female Gametophyte in Two Kenyan Species of Inversodicraea (Podostemaceae)

S. Sikolia and J.C. Onyango    

Abstract: This study aims to elucidate the ontogeny and organization of the female gametophyte. Further, provide evidences for the strike phenomenon in the Podostemaceae. The female gametophyte ontogeny in Inversodicraea bifurcata Engl. I. keniensis sp. nov. Nagendran et Sikolia conforms to the Apinagia type of the monosporic category. The primary chalazal nucleus degenerates at the two-nucleate stage. The strike phenomenon met in the family is discussed. The organized female gametophyte is four-nucleate, four-celled and consists of two pear shaped synergids, a large central egg cell and a polar cell. Filiform apparatus are present in the synergids. Based on the female gametophyte ontogeny, there are no antipodal cell(s). Earlier reports of double fertilization are not confirmed, but only single fertilization take place in the family. The nucellar plasmodium is rationalized on its organization and ontogeny and is formed before fertilization in Inversodicraea. Effects of tension force and lytic enzymes during nucellar plasmodium organization and its ultimate significance are discussed.

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