Characteristics of floral nectaries and nectar in two species of Crataegus (Rosaceae)

被引：0
|
作者：
E. Weryszko-Chmielewska
M. L. Masierowska
A. Konarska
机构：
[1] Department of Botany,
[2] Agricultural University,undefined
[3] Lublin,undefined
[4] Poland,undefined
来源：
Plant Systematics and Evolution | 2003年 / 238卷
关键词：
Key words: Nectary structure, nectary stomata, nectar amount, nectar sugars, Crataegus coccinea L., Crataegus crus-galli L.;
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摘要：
 The structure of floral nectaries of Crataegus coccinea and C. crus-galli was examined using light and scanning electron microscopy. The radial length of the floral nectary, measured from longitudinal sections of flowers, was 30% larger in C. crus-galli than in C. coccinea. For both Crataegus species the glandular tissue thickness was similar – approx. 400 μm. Also, the number of stomata per mm2 of nectary surface in C. crus-galli was much higher (by 43%) than for C. coccinea. Stomata were situated in deep hollows. For both taxa the period of nectar secretion was 4 days. The mean quantity of total sugar in nectar per 10 flowers of C. crus-galli and C. coccinea was 3.87 mg and 0.33 mg, respectively.
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页码：33 / 41
页数：8
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