J Integr Plant Biol. ›› 1960, Vol. 9 ›› Issue (1): -.

• Research Articles •    

Some Observations on the Endosperm Development in Angiosperms

N. F. Chien and C. N. Kang   

Abstract: From the preparations of the dissected endosperms of more than 20 angiosperms, it has been found that in the majority of cases the division of the primary endosperm nucleus takes place in advance of the fertilized egg. In the early stages of the endosperm development the free nuclei are usually of the same size, and more or less evenly distributed in the cytoplasm. Later the free nuclei at the micropylar end and those at the chalazal end begin to differ in size and density. The primary endosperm nucleus, as a rule, divides mitotically for the first divisions. Later the occurrence of mitoses is also regular. At the same time, amitoses are frequently met with particularly in the endosperm of the leguminous plants in which different kinds of amitoses may be seen in the same endosperm and in rare cases the free nuclei divide one after another and the daughter nuclei may be still connected together to form a long chain. In the material observed amitoses are very rare in the endosperms of some plants such as Ricinus communis, Viola spp. etc. Usually amitoses are seen at the chalazal end. During the early stages of the endosperm development the fusion of the free nuclei may take place, though it occurs rather infrequently. The endosperm chalazal haustoria are usually well developed in Leguminosae and Cucurbitaceae and these structures are better studied from the dissected materials.

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