• N Sathyananda

      Articles written in Proceedings – Section B

    • Reverse polarity inNauclea orientalis, L. (Sarcocephalus cordatus, Miq.)

      S Sundara Rajan G Shivaramaiah N Sathyananda

      More Details Abstract Fulltext PDF

      Embryo sac development conforms to Polygonum type. Starch grains are noticed in the embryo sac right from the megaspore mother cell stage. Twin tetrads one with a chalazal functional megaspore and another with a micropylar functional megaspore have been noticed in some ovules. While 75% of the embryo sacs have normal polarity, in 20% of the ovules reverse polarity has been noticed. In the remaining 5% of the ovules, ‘bipolarity’ has been observed. Reverse polarity in relation to double archegoniate theory has been discussed.

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