Genetic Diversity and Population Structure of Acacia senegal (L) Willd. in Kenya

Abstract

The NERC and CEH trade marks and logos ('the Trademarks') are registered trademarks of NERC in the UK and other countries, and may not be used without the prior written consent of the Trademark owner. 2 The level of genetic diversity and population structure of Acacia senegal variety kerensis 3 in Kenya was examined using seven polymorphic nuclear microsatellite loci and two 4 chloroplast microsatellite loci. In both chloroplast and nuclear datasets, high levels of 5 genetic diversity were found within all populations and genetic differentiation among

Genetic diversity and hybridization in the two species Inga ingoides and Inga edulis: potential applications for agroforestry in the Peruvian Amazon

“…In a previous study, similar results were found with individuals showing mixed ancestry and low differentiation among populations, reflecting strong gene flow of Kenyan populations of Acacia senegal (Omondi et al 2010). Within the genus Inga, Cruz-Neto et al (2014) uncovered a similar pattern in the I. vera species.…”

“…The weak population genetic structure together with the lack of isolation-by-distance (data not shown) suggests that species ecology, such as pollen and seed dispersal, and demographic history (impacted by flood) is a strong driver of population structure in the studied I. edulis and I. ingoides populations, as in the case of Acacia senegal (Omondi et al 2010).…”

“…Thus, the heterozygotes deficiency could lead to lower competition ability, possibly explaining why this species is rarely found outside the riparian zone. In Acacia senegal (L.) Willd., Omondi et al (2010) found that the only population with positive F IS was even-sized, suggesting the existence of one or few cohorts, possibly established together as a result of some disturbance event, and they argued that the area was prone to flooding, which could provide a mechanism for non-random seed dispersal. Indeed, seeds dispersed downstream could help to explain the departure from HWE in I. ingoides, though this hypothesis ought to be tested using a similar approach found in the study made with Calycophyllum spruceanum in the Peruvian Amazon (Russell et al 1999).…”

Plio-Pleistocene history and phylogeography of Acacia senegal in dry woodlands and savannahs of sub-Saharan tropical Africa: evidence of early colonisation and recent range expansion

“…The species is reproductively active within 2-4 years of establishment. Previous genetic studies of Kenyan populations using both chloroplast and nuclear microsatellites found high genetic diversity within populations and low genetic differentiation among populations, indicating extensive gene flow (Omondi et al, 2010). These attributes demonstrate effective pollen and seed dispersal mechanisms with potential for long-distance dispersal.…”

Genetic diversity and differentiation of invasive <i>Acacia longifolia</i> in Portugal

“…Many molecular markers have been used in population and phylogenetic studies in acacias, including inter-simple sequence repeats (ISSRs), simple sequence repeats (SSRs or microsatellites), chloroplastidial DNA and internal and external transcribed spacers (ITS and ETS respectively) (Thompson et al, 2012(Thompson et al, , 2015Omondi et al, 2010Omondi et al, , 2016Harris et al, 2012;Miller et al, 2011;Le Roux et al, 2011Fredua-Agyeman et al, 2008;Mulumba et al, 2012;Josiah et al, 2008;Ndlovu et al, 2013;Murphy et al, 2010;Brown et al, , 2012. Furthermore, several SSRs markers have been developed for Acacia species, such as A. atkinsiana (Levy et al, 2014), A. brevispica (Otero-Arnaiz, 2005.…”