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Journal of Cell Science, Vol 69, Issue 1 127-135, Copyright © 1984 by Company of Biologists

JOURNAL ARTICLES

Post-pollination callose development in ovules of Rhododendron and Ledum (Ericaceae): zygote special wall

EG Williams, RB Knox, V Kaul and JL Rouse

In Rhododendron spp. and Ledum groenlandicum a callose wall is laid down around the zygote in the first 2 days after fertilization. The periodic acid/Schiff-positive, aniline blue-fluorescence-positive callosic wall is initiated adjacent to the degenerating synergid, extends to cover the entire zygote surface, and remains visible during the initiation of embryogeny as the zygote elongates before the first proembryonal division. Unfertilized ovules show eventual callose deposition in the ovule wall cells during senescence in undeveloped abscising pistils, but show no development of callose within the embryo sac. Possible roles of a zygote special callose wall are discussed.




© The Company of Biologists Ltd 1984