Variation in seed traits and germination potential of Solanum elaeagnifolium in Greece
Solanum elaeagnifolium (Solanaceae, EPPO A2 List) is a widespread weed in Northern Greece which was introduced on various occasions from southwestern USA. High propagule pressure, including both the size and number of introductions, shaped its genetic structure in Greece and increased its genetic diversity. The plant can produce high numbers of seeds.
The differences between seed production, seed traits and germination potential in invasive populations in Greece and in native populations in Texas were explored. The origin had no effect on the fruit diameter and on the number of seeds per fruit. However, Greek seeds were thicker and heavier than Texan seeds. Greek seeds may then have a survival advantage over Texan seeds during seedling establishment, and a subset of seeds may be able to withstand new and possibly unfavorable conditions.
Sources
Oukhouia F, Guermache F, Kashefi J, Fried G, Bon MC (2014) Variation in seed traits and germination potential of Solanum elaeagnifolium Cav. following its invasion in Greece. Abstract of the 4th International Symposium on Environmental Weeds and Invasive Plants, Montpellier (FR), 2014-06-19/23.