Infraspecific Variation in Silene Seed Tubercles

Area of Science:

• Botany
• Plant Morphology
• Taxonomy

Background:

• Seeds of Caryophyllales species often feature surface protuberances known as tubercles.
• Previous taxonomic use of tubercles lacked quantitative data, relying on descriptive adjectives.

Purpose of the Study:

• To quantitatively analyze seed surface tubercles in Caryophyllales, focusing on width, height, and curvature.
• To investigate infraspecific differences in tubercle size and shape within the genus Silene.

Main Methods:

• Applied quantitative measurements (width, height, curvature) to seed tubercles of 31 species (12 in Silene subg. Behenantha, 19 in S. subg. Silene).
• Classified tubercles into echinate and rugose categories based on quantitative data.
• Examined tubercle variations across 31 populations of eight Silene species.

Main Results:

• Echinate tubercles showed higher height/curvature and lower width, prevalent in S. subg. Behenantha.
• Rugose tubercles were more abundant in S. subg. Silene.
• Significant infraspecific differences in tubercle size and shape were found in most examined Silene species.
• A novel umbonate/mammillate tubercle type with high curvature was identified in Silene nocturna.

Conclusions:

• Quantitative analysis provides objective criteria for tubercle classification, enhancing taxonomic studies.
• Morphological variations in seed tubercles are significant both between and within Silene species.