Història poblacional de plantes carnívores

Drosera rotundifolia (Foto: Wikimedia, P. Douhly)

La prestigiosa revista American Journal of Botany acaba de publicar un article de Jordi López-Pujol amb els professors MY Chung i MG Chung, de la Universitat de Gyeonsang de Corea, on s’analitza, a partir de dades genètiques, l’origen de les poblacions coreanes de dues espècies d’atrapamosques, les carnívores Drosera peltata i D. rotundifolia. Així, D. peltata mostra un únic origen (S. Japó o S. Xina) amb dispersió postglacial, mentre que D. rotundifolia hauria sobreviscut el màxim glacial (LGM) in situ, conservant genotips de diversos orígens, la qual cosa imposaria estratègies de conservació diferenciades en ambdós casos.

 

 

 

Chung, M. Y., López-Pujol, J. & Chung, M. G. (2013). Population history of the two carnivorous plants Drosera peltata var. nipponica and Drosera rotundifolia (Droseraceae) in Korea. American Journal of Botany 100 (11): 1-9 (online first, DOI: 10.3732/ajb.1200486)

Abstract

 

PREMISE OF THE STUDY:

Drosera peltata var. nipponica, an element of the East Asia warm-temperate vegetation, and D. rotundifolia, a widely distributed boreal species, reach one of their northernmost and southernmost limits, respectively, on the Korean Peninsula. Because the Last Glacial Maximum (LGM)-Holocene dynamics of warm-temperate and boreal paleovegetation differed considerably on the Peninsula, the population history of these two sundews is expected to be different, leaving differential imprints in their genetic structure.

METHODS:

We investigated population genetic structure of D. peltata var. nipponica and D. rotundifolia in South Korea (10 populations of each for 20 allozyme loci) to infer their population history in this region. In addition, we compared the genetic variation harbored in the two sundews to those reported for other carnivorous and wetland plants.

KEY RESULTS:

Drosera peltata var. nipponica showed no genetic diversity, whereas D. rotundifolia exhibited extremely low within-population variation (He = 0.005) and considerable among-population divergence (FST = 0.817).

CONCLUSIONS:

Our results suggest that extant populations of D. peltata var. nipponica likely originated from a single ancestral population from southern Japan or southern China through postglacial dispersal. On the contrary, D. rotundifolia probably survived the LGM in situ, with extant populations derived from either one or several small source populations. We argue that separate conservation strategies should be employed, given that the two taxa have different ecological and demographic traits and harbor different levels of genetic diversity.

KEYWORDS:

Drosera, Droseraceae, Last Glacial Maximum, allozymes, conservation, genetic drift, glacial refugia, population history

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Accés al resum i publicació – PubMed

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