Nucellar and integumentary embryony in angiosperms
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چکیده
منابع مشابه
Hormones in wheat kernels during embryony
Abscisic acid (ABA), indole-3-acetic acid (IAA) and six cytokinins in wheat (Triticum aestivum L.) grain components were extracted, from 0 to 25d post anthesis (DPA), and quantified by noncompetitive indirect ELISA. At 3 DPA, which coincides with early embryo and endosperm cell divisions, whole kernel hormone levels in μmolkg–1 dry mass (DM) were: zeatin (Z) 30, IAA 4, zeatin riboside 1.8, ABA ...
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A .—There is widespread interest in the roles that carotenoids play as yolk and shank pigments, antioxidants, and immune-system regulators in chickens, but nothing is known of such functions in the wild ancestors of chickens—the Red Junglefowl (Gallus gallus). We manipulated carotenoid access in the diet of captive male and female Red Junglefowl to investigate its eff ects on the coloration of ...
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Crocodilians, which include alligators and crocodiles, have a tough exterior with scales covering their dorsal and ventral surfaces. Living on earth before the dinosaurs, these reptilians have evolved a structure that has helped them adapt to the changing environment of earth. This structure is called an integumentary sensory organ (ISO). Integumentary is a term, which refers to the skin surfac...
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With increases in both the size and scope of phylogenetic trees, we are afforded a renewed opportunity to address long-standing comparative questions, such as whether particular fruit characters account for much of the variation in diversity among flowering plant clades. Studies to date have reported conflicting results, largely as a consequence of taxonomic scale and a reliance on potentially ...
متن کاملAperture pattern ontogeny in angiosperms.
Pollen grains display a wide range of variation in aperture number and arrangement (pattern) in angiosperms. Apertures are well-defined areas of the pollen wall surface that permit pollen tube germination. For low aperture numbers, aperture patterns are characteristic of the major taxonomic divisions of angiosperms. This paper presents a developmental model that explains most of the aperture pa...
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ژورنال
عنوان ژورنال: Acta Societatis Botanicorum Poloniae
سال: 2014
ISSN: 2083-9480
DOI: 10.5586/asbp.1981.034