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331.
Eight species of the genus Macrosiphum Passerini 1860 (Sternorrhyncha: Aphididae) are recognized from the Korean Peninsula. A new species, Macrosiphum ( Macrosiphum ) paektusani n. sp., is described herein for apterous and alate viviparous females on Rosa marretii Lev. (Rosaceae). The taxonomic position of Macrosiphum ( Macrosiphum ) cornifoliae Shinji 1924, com. rev., is transferred from the genus Sitobion Mordvilko 1914 to its original position. Host plants of the Korean Macrosiphum are reviewed and the identification key to subgenera and species is also presented. 相似文献
332.
《Biotechnic & histochemistry》2013,88(2):92-93
Transverse paraffin sections of mature greenwood stems of rose (Rosa x hybrida) and flowering dogwood (Cornus florida L.) were stained with Bismarck brown followed by azure B or tolnidine blue O. The Bismarck brown was replaced by thiazin dye metachromasia in all structures except the cuticle which remained brown or yellow. The interface between the cuticle and exterior cell walls of the epidermis was delineated clearly. 相似文献
333.
Floral development in bolting garlic 总被引:5,自引:0,他引:5
Garlic (Allium sativum L.) is a completely sterile plant, propagated only vegetatively. The aim of this research was to study the sequence of morphological
processes occurring during floral initiation and development of a number of bolting garlic accessions from the Allium gene bank in Israel by using SEM. The garlic inflorescence is an umbel-like flower arrangement, the branches (flower clusters)
of which arise from a common meristem. The numerous flowers have a distinct morphology typical of the genus Allium. Flower-stalk elongation precedes the swelling of the apical meristem and its subdivision into several centers of floral development.
Within clusters, floral primordia develop unevenly. Differentiation of topsets begins after floral differentiation on the
peripheral part of the apical surface, and their size, number and rate of development vary among genotypes. At least four
morphological types differing in flower/topset ratio were distinguished among the 12 clones studied in this investigation.
For further studies of flowering physiology and fertility restoration, only clones which can differentiate the greatest proportion
of normal flowers and the least of topsets in the apical meristem should be selected.
Received: 28 June 2000 / Revision accepted: 6 November 2000 相似文献