Scientific journal
Scientific Review. Biological science
ISSN 2500-3399
ПИ №ФС77-57454

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EMBRYOLOGICAL FEATURES OF THE STRUCTURE AND DEVELOPMENT OF OVULES AND EMBRYO SACS OF SEVERAL SPECIES OF SYRINGA L.

Zhakova S.N. 1 Novoselova L.V. 2
1 Perm state agricultural academy named after academician D.N. Pryanishnikov
2 Perm State National Research University
The results of the examination of embryological features of structure and growth of ovule and embryo sac of several species and hybrids of Syringa L., subgenus Syringa, Villosae C.K. Schneid. section: S. josikaea J. Jacq. ex Rchb., S. emodi Wall. ex Royle, S. wolfii C.K. Schneid., S. sweginzowii Koehne & Lingelsh., S. villosa Vahl, S. × prestoniae McKelvey (S. komarowii subsp. reflexa× S. villosa), S. × henryi C.K. Schneid. (S. josikaea× S. villosa) are presented in the article. The samples are taken from the collection of syringarium in the A.G. Genkel botanical garden of Perm state national research university. The examines species and hybrids of Syringa are characterized by a similar development of their feminine reproductive sphere. The gynecium type is syncarpous. The ovary is superior, bilocular, is formed from two carpels growing into one. A single ovary contains from 1 to 4 ovules, more frequently 2. The ovules are anatropous. Nucellus of an ovule consists of a layer of early dissolving cells. Single integument is well developed. There is only one archesporial cell, which arises in most species and hybrids on the third ten-day period of May, in S. villosa on the second ten-day period of May. Megaspore tetrad is linear, the functional megaspore is chalazal. A mature embryo sac is of prolonged shape and consists of an egg cell and two synergids in the micropylar part, a central cell with two polar nuclei, three antipodes in the chazal part. Nuclear fusion in all the analyzed species and hybrids is registered before fertilization, at the bud flower stage (S. wolfii, S. emodi, S. sweginzowii), at the half-open blossom stage (S. josikaea) and at the open blossom stage (S. villosa, S. × prestoniae, S. × henryi). No disturbances in the development of ovules and embryo sacs that may be a reason for the low seed production of the examined species and hybrids have were registered.