Population Genetic Structure and Reproductive Strategy of the Introduced Grass Centotheca lappacea in Tropical Land-Use Systems in Sumatra

2016 | journal article; research paper. A publication with affiliation to the University of Göttingen.

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​Population Genetic Structure and Reproductive Strategy of the Introduced Grass Centotheca lappacea in Tropical Land-Use Systems in Sumatra​
Hodac, L.; Ulum, F. B.; Opfermann, N.; Breidenbach, N.; Hojsgaard, D. H.; Tjitrosoedirdjo, S. S. & Vornam, B. et al.​ (2016) 
PLoS ONE11(1) art. e0147633​.​ DOI: https://doi.org/10.1371/journal.pone.0147633 

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Authors
Hodac, Ladislav; Ulum, Fuad Bahrul; Opfermann, Nicole; Breidenbach, Natalie; Hojsgaard, Diego H.; Tjitrosoedirdjo, Sri Sudarmiyati; Vornam, Barbara; Finkeldey, Reiner; Hoerand, Elvira
Abstract
Intensive transformation of lowland rainforest into oil palm and rubber monocultures is the most common land-use practice in Sumatra (Indonesia), accompanied by invasion of weeds. In the Jambi province, Centotheca lappacea is one of the most abundant alien grass species in plantations and in jungle rubber (an extensively used agroforest), but largely missing in natural rainforests. Here, we investigated putative genetic differentiation and signatures for adaptation in the introduced area. We studied reproductive mode and ploidy level as putative factors for invasiveness of the species. We sampled 19 populations in oil palm and rubber monocultures and in jungle rubber in two regions (Bukit Duabelas and Harapan). Amplified fragment length polymorphisms (AFLP) revealed a high diversity of individual genotypes and only a weak differentiation among populations (F-ST = 0.173) and between the two regions (F-ST = 0.065). There was no significant genetic differentiation between the three land-use systems. The metapopulation of C. lappacea consists of five genetic partitions with high levels of admixture; all partitions appeared in both regions, but with different proportions. Within the Bukit Duabelas region we observed significant isolation-by-distance. Nine AFLP loci (5.3% of all loci) were under natural diversifying selection. All studied populations of C. lappacea were diploid, outcrossing and self-incompatible, without any hints of apomixis. The estimated residence time of c. 100 years coincides with the onset of rubber and oil palm planting in Sumatra. In the colonization process, the species is already in a phase of establishment, which may be enhanced by efficient selection acting on a highly diverse gene pool. In the land-use systems, seed dispersalmight be enhanced by adhesive spikelets. At present, the abundance of established populations in intensively managed land-use systems might provide opportunities for rapid dispersal of C. lappacea across rural landscapes in Sumatra, while the invasion potential in rainforest ecosystems appears to bemoderate as long as they remain undisturbed.
Issue Date
2016
Journal
PLoS ONE 
Project
SFB 990: Ökologische und sozioökonomische Funktionen tropischer Tieflandregenwald-Transformationssysteme (Sumatra, Indonesien) 
SFB 990 | B | B03: Plant genetic diversity in tropical lowland rainforest transformation systems 
SFB 990 | B | B12: Reproductive strategies of weedy flowering plants in tropical rainforest transformation systems 
Organization
Fakultät für Forstwissenschaften und Waldökologie ; Büsgen-Institut ; Abteilung Forstgenetik und Forstpflanzenzüchtung 
ISSN
1932-6203
Subject(s)
sfb990_journalarticles
Sponsor
Open-Access-Publikationsfonds 2016

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