1The Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing 100083, People’s Republic of China.
2 College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China.
3Université de Lomé, Laboratoire de botanique et écologie végétale, Faculté des sciences, BP 1515, Lomé, Togo.
4College of Agronomy, IPR / IFRA, Katibougou Bp: 06, Koulikoro, Mali.
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