Morphological characterisation of the floral nectary in some apple-shaped and pear-shaped quince cultivars

Nagy-Déri, H. and Orosz-Kovács, Zs. and Farkas, Á. (2007) Morphological characterisation of the floral nectary in some apple-shaped and pear-shaped quince cultivars. Acta Botanica Hungarica, 49 (3-4). pp. 359-375. ISSN 0236-6495

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Abstract

The receptaculo-ovarial nectary of quince is located on the adaxial surface of the hypanthium. The glandular tissue is protruding out of the basal part of the receptacular tissue, but the apical part of the nectary is epimorphic. The glands can have various shapes if observed in the median longitudinal section of the flower and gland shapes are characteristic to the cultivars. The anisodiametrical cells of the nectarial epidermis are arranged in one or two rows. The surface of the nectary is covered by cuticle, the thickness of which depends on climatic conditions. Stomata of the nectary are mesoxeromorphic, the guard cells are sunken below the outer anticlinal wall of the epidermis cells. The investigated pear-shaped quince cultivars have more sunken stomata than the apple-shaped ones. Both the glandular tissue and the nectary parenchyma are the thickest on the basal part of the nectary, but taper on the apical part. The nectary parenchyma cells differ from the receptacular ones in shape and size. The phloem bundles, supplying the nectary, do not enter into direct contact with the secretory tissues.The morphological and histological differences that can be found between the nectary of cvs. ‘Konstantinápolyi’ and cvs. ‘Dunabogdányi’, as well as between the gland of the investigated apple-shaped cultivars and pear-shaped ones, can have taxonomic importance and could refer to the various degree of susceptibility of the cultivars to Erwinia amylovora .

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