Abstract
In the flowers of <i>Allium</i> there are found septal nectaries; in particular species, their outlet can be located in different parts of the ovary. The inflorescences of these plants are a rich source of nectar for insects. The location and structure of septal nectaries in the flowers of <i>Allium giganteum</i> Regel were investigated. Light and scanning electron microscopy was used. The septal nectaries were found to be located in the lower part of the ovary and in the gynophore on which the ovary is borne. Nectar is secreted into the nectary slits from which it flows through the ducts to three openings located in the upper part of the gynophore, from whence it gets outside in the vicinity of the expanded parts of the filaments. Sugar concentration in the nectar of <i>A. giganteum</i> averaged 54.5%, while sugar weight per flower was determined to be 0.36 mg. When converted into sugar weight per inflorescence, numbering more than 2,000 flowers, it was 771.7 mg.
Highlights
IntroductionMany species of the genus Allium produce impressive, intensely coloured inflorescences and for this reason they are grown as ornamental plants (Kamenetsky and Fritsch , 2002)
Many species of the genus Allium produce impressive, intensely coloured inflorescences and for this reason they are grown as ornamental plants (Kamenetsky and Fritsch, 2002).Allium giganteum Regel is native to the Himalayas and Central Asia
Microscopic slides for light microscopy (LM) examination were prepared from hand-cut sections made from fresh plant material and material fixed in 70% ethanol
Summary
Many species of the genus Allium produce impressive, intensely coloured inflorescences and for this reason they are grown as ornamental plants (Kamenetsky and Fritsch , 2002). Allium giganteum Regel is native to the Himalayas and Central Asia. It produces high inflorescence stems that may reach a height of 125-200 cm. Heather or purple-red flowers are clustered in globular dense inflorescences with a diameter of 10-12 cm, sometimes reaching 20 cm in diameter. The plants flower from May to July. They are planted as individual specimens in green areas as well as they are used for cut flowers and dry floral arrangements (Hertogh de and Zimmer , 1993; Kamenetsky and Fritsch , 2002; Krzymińska , 2003, 2008)
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