Studies on Seed Morphology of Cyananthus (Campanulaceae) and Its Taxonomical Significance

doi:10.7677/ynzwyj201313065

Abstract

Abstract:

Morphological characteristics of seeds (external, interior and seedcoat) in 11 species of Cyananthus were examined under stereomicroscope and scanning electron microscopy (SEM). The results indicate that seeds of Cyananthus are narrowly ovoid in shape, episperm are black, tan or brown and smooth. The episperm of sect. Stenolobi has a special black seed mottling. Embry of the seeds belongs to dwarf type, with white or brown, colloidal or oily endosperm. Ornamentation of seed coat belongs to striate type, ribs arranged spirally or parallel, and could further be divided into three types, as broadly reticulatestriate, narrowly reticulatestriate and striate. The seed morphology varies apparently among the three sections within the genus. The characters of seeds, such the length, the color on the surface and the ornamentation on seed coat, are of great significance in distinguishing the three sections of Cyananthus. Besides, sect. Annui demonstrated the highest level of diversification in seed morphology, which may be correlated to the more advanced adaptation of this section.

Key words: Cyananthus, Seed morphology, Taxonomy, Systematics

CLC Number:

Q 944
Q 949

ZHOU Zhuo-, CHEN Guang-Fu-, ZHANG Jian-Wen-, NIU Yiang-, LI Zhi-Min-, SUN Hang. Studies on Seed Morphology of Cyananthus (Campanulaceae) and Its Taxonomical Significance[J]. Plant Diversity, 2013, 35(3): 265-272.

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