Формирование спермодермы у видов подрода Amaranthus рода Amaranthus (Amaranthaceae)статья

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1. Полный текст veselova_etal_Kaden.pdf 1,3 МБ 13 октября 2015 [TimoninAC]

[1] Веселова Т. Д., Джалилова Х. Х., Тимонин А. К. Формирование спермодермы у видов подрода amaranthus рода amaranthus (amaranthaceae) // Мемориальный каденский сборник [Kaden's Memorial Book] / Под ред. Л. И. Лотова, А. К. Тимонин. — МАКС Пресс, Москва, 2014. — С. 54–66. Veselova T.D., Dzhalilova Kh.Kh., Timonin A.C. DEVELOPMENT OF SEED COAT IN SPECIES OF GENUS AMARANTHUS L. SUBGENUS AMARANTHUS (AMARANTHACEAE). The seed coat comes from both integuments in black-seeded Amaranthus hypochondriacus and A. retroflexus and in white-seeded A. caudatus and A. cruentus. The outer integument is basically 2-layered, but it is multilayered in chalaza and raphe regions. The middle layers result from periclinal cell divisions in its inner layer which can be succeeded by periclinal cell divisions in the innermost middle layer. The inner integument is basically 2-layered, but it is 3- to 4-layered in micropyle region and sometimes discontinuous in the chalaza region. Its inner cell layer invariably changes into thin endotegmen of small highly flattened thin-walled cells with inner cell walls bearing numerous striate thickenings typical of many centrosperm’s seeds. The outer cell layer of the inner integument always obliterates in both black seeds and white ones. The outer integument transforms into the testa, which differs in black and white seeds. The inner cell layer of this integument develops into continuous endotesta of thin-walled cells in black seeds. These cells are deformed but quite distinguishable in mature seed coat. This cell layer mostly obliterates in white seeds, though it sometimes remains in micropylar and/or chalazal regions as highly deformed endotesta fragment/s. Deformed parenchymal mesotesta is occasionally visible in chalaza and/or raphe regions of black seeds. The outer cell layer of the outer integument changes into thick exotesta in black seeds and into much thinner one in white counterparts. The black seed exotesta cells have very thick outer cell wall. It is yellowish brown due to deposited high polymeric tannic substances and contains numerous anticlinal blackish stalactites. Much thinner outer cell walls of the white seed exotesta cells are colorless and contain short hardy visible pale gray stalactites. These cell walls must contain less polymeric colorless tannic substances, which block applied histochemical reactions. Then, the seed coat of black seeds is basically 3-layered, testal endotegminal, whereas that of white seeds is 2-layered, exotestal endotegminal. The difference must have been resulted from prolong selection for thin and fragile seed coat in white-seeded crop amaranths. Mature black and white seeds have 2 discernible cuticles: cuticle 1 on the exotesta surface and the thickest cuticle 3 on the endotegmen surface. The cuticles on the surfaces of endotesta and exotegmen are indiscernible.

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