Understanding biological and ecological factors affecting seed germination of the multipurpose tree Anogeissus leiocarpa

Anogeissus leiocarpa (DC.) Guill. & Perr. (Combretaceae) has important economic and cultural value in West Africa as source of wood, dye and medicine. Although this tree is in high demand by local communities, its planting remains limited due to its very low propagation via seed. In this study,...

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Published in:	Plant biology (Stuttgart, Germany) Vol. 20; no. 3; pp. 602 - 609
Main Authors:	Mattana, E, Sacande, M, Bradamante, G, Gomez-Barreiro, P, Sanogo, S, Ulian, T
Format:	Journal Article
Language:	English
Published:	England Wiley Subscription Services, Inc 01-05-2018
Subjects:	Anogeissus Combretaceae - anatomy & histology Combretaceae - physiology Ecology Fruit - anatomy & histology Fruit - physiology Fruits Germination Germination - physiology Imbibition Local communities Methylene blue Morphology Plantations Propagation Seed germination Seeds Seeds - anatomy & histology Seeds - metabolism Seeds - physiology Sulfuric acid Temperature Temperature requirements Time Factors Trees Trees - physiology Water - metabolism Wood fruit morphology base temperature thermal germination requirements Combretaceae germination response orthotropous ovule
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Summary:	Anogeissus leiocarpa (DC.) Guill. & Perr. (Combretaceae) has important economic and cultural value in West Africa as source of wood, dye and medicine. Although this tree is in high demand by local communities, its planting remains limited due to its very low propagation via seed. In this study, X-rays were used to select filled fruits in order to characterise their morphology and seed germination responses to treatment with sulphuric acid and different incubation temperatures. Morphological observations highlighted a straight orthotropous seed structure. The increase in mass detected for both intact and scarified fruits through imbibition tests, as well as morphological observations of fruits soaked in methylene blue solution, confirmed that they are water-permeable, although acid-scarified fruits reached significantly higher mass increment values than intact ones. Acid scarification (10 min soaking in 98% H SO ) positively affected seed germination rate but not final germination proportions. When intact fruits where incubated at a range of temperatures, no seeds germinated at 10 °C, while maximum seed germination (ca. 80%) was reached at 20 °C. T values ranged from a minimum of ca. 12 days at 25 °C to a maximum of ca. 34 days at 15 and 35 °C. A theoretical base temperature for germination (T ) of ca. 10 °C and a thermal requirement for 50% germination (S) of ca. 195 °Cd were also identified for intact fruits. The results of this study revealed the seed germination characteristics driven by fruit and seed morphology of this species, which will help in its wider propagation in plantations.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1435-8603 1438-8677
DOI:	10.1111/plb.12702