J Integr Plant Biol. ›› 1981, Vol. 23 ›› Issue (3): -.

• Research Articles •    

The Micro-and Mega-Sporogenesis and the Formation of Male and Female Gametophytes in Gastrodiadata Blume

Liang Han-xing   

Abstract: The present paper deals with the morphogenesis of the micromegaspore and the formation of male and female gametophytes in Gastrodia elata Blume. The embryo sac is originated from the chalazal megaspore of a triad. In the mature embryo sac, the egg apparatus and the single polar nucleus are derived from the four microphylar nuclei. These two chalazal once are disappered before the maturation of the embryo sac. It is a simplified form of the Polygonum type. The origin and the formation of the male gametophyte in Gastrodia elata are similar to that of the Orchidaceous in general. The tetrads of each anther are adhered and become into massulae. The extent range of the adherent are gcnerally from hundreds to more or less one thousand. A preliminary observation are revealed by the writer under the fluorescence microscope relating to the variation of the components of their cell walls during the different stage of the sporogenesis as well as the formation of the male gametophyte. In this papre, the signifieancc of the existence of pollinia substanee arounding the massulae as well as the temporal occurance callour of the generative cell have been disseussed.

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