J Integr Plant Biol. ›› 1960, Vol. 9 ›› Issue (2): -.

• Research Articles •    

Studies in the Polyembryony of Hosta caerulea Tratt. I. Observations on the Embryogeny and the Origin of Polyembryony

S. Y. Hu   

Abstract: 1. The present investigation deals with the embryogenesis and the origin of the polyembryony of Hosta caerulea, These observations will serve as a basis for further experimental studies on the biological meaning of the polyembryony. 2. The development of embryosac of Hosta caerulea belongs to Adoxa type and the development of endosperm to helobial type. Along with the development of zygotic embryo from the fertilized egg the development of adventive embryos is initiated from some epidermal cells of nucellus at the micropylar end by cell divisions. Usually two embryos are developed in the mature seed and during the proembryo stage there are often 3–5, even as many as 7 embryos being developed. 3. The initials of adventive embryos may be recognized as early as embryo-sac stage. These cells are not fertilized but the functional cells are found only around the place where the pollen tube is passing through. 4. The development of adventive embryos usually precedes that of zygotic embryo. Under certain circumstances the zygote is going to degenerate. During the proembryo stage it is occasionally difficult to find the zygotic embryo. However, it is still uncertain whether the two embryos as found in mature seed are all adventive embryos or one of them is the zygotic embryo.

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