Why are the seeds of this species difficult? The seeds may have physical dormancy, which can be overcome by scarifying the seed coat to allow water uptake and encourage germination.
Macrotyloma geocarpum (Image: S. Wood, RBG Kew)
This species has Orthodox seeds - dry to 15-20% eRH and store at -20ºC, or as cool as possible.
The seeds of this species may be Physically Dormant (based on members of the same family). Chip the seed coat with a scalpel before placing under germination conditions.
Germinate on agar, germination paper (between paper or top of paper) or sand at constant temperatures of 35ºC. It may be necessary to wash the seeds in a solution of saturated calcium hypochloride for 5 mins before chipping and sowing, to prevent fungal contamination during germination.
(Image: S. Wood, RBG Kew)
Accepted name: Macrotyloma geocarpum (Harms) Maréchal & Baudet
Synonyms: Kerstingiella geocarpa Harms
References and Links
- Food and Agriculture Organization of the United Nations and International Plant Genetic Resources Institute (1994). Genebank Standards. FAO/IPGRI, Rome, Italy.
- International Seed Testing Association (2010). International Rules for Seed Testing: edition 2010. ISTA, Bassersdorf, Switzerland.
- AFPD (African Flowering Plants Database) - Conservatoire et Jardin Botaniques de la Ville de Genève, Switzerland, and South African National Biodiversity Institute, Pretoria, RSA: Macrotyloma geocarpum.
- PROTAbase (Plant Resources of Tropical Africa) - Wageningen, Netherlands: Macrotyloma geocarpum.
- SID (Seed Information Database) - Royal Botanic Gardens, Kew, UK: Macrotyloma geocarpum.
- Tropicos - Missouri Botanical Garden, USA: Macrotyloma geocarpum.