Hybridization Between Wild and Domesticated Types of Phaseolus vulgaris L. (Fabaceae) in Argentina

Abstract

A polymorphic population of Phaseolus vulgaris L. var. aborigineus (Burkart) Baudet growing in northwestern Argentina was studied. In order to know the origin of this polymorphism, plants belonging to the var. aborigineus, others showing floral dimorphism and individuals with weedy type characters were collected. Their seeds, obtained after fieldwork treatments of autogamy and free pollination in order to know their reproductive system, were sown in a greenhouse. Information of their growth was recorded and several numerical analyses were performed. With the results obtained, we concluded that those individuals that showed floral dimorphism are probably a result of hybridization and/or introgression between the var. aborigineus and cultivated forms that grow in the area. This hypothesis is supported by the presence of divergent segregation in the offspring. Also, the offspring of the F1 was followed and allowed us to conclude the possible existence of degeneration of the hybrid progeny. This degeneration indicates that an unwanted gene flow in the area could lead to a decline in the wild bean population. The vigour and high reproductive success of the offspring belonging to the individuals corresponding to the var. aborigineus, whose progenitor was treated for outcrossing, and the existence of plants with weedy type characteristics, are indicative of the necessity to preserve this germplasm in order to evaluate its agronomic potential as brief as possible. The population here studied constitutes a wild-weed-crop complex growing in Argentina.

Hybridization between crops and wild relatives: the contribution of cultivated lettuce to the vigour of crop–wild hybrids under drought, salinity and nutrient deficiency conditions

“…Multiple studies have focused on the rate of hybridization between crops and wild relatives (Arias and Rieseberg 1994 ; Hoc et al 2006 ; D’Andrea et al 2008 ; Giannino et al 2008 ; Kiær et al 2009 ), and on the occurrence of hybrids and their fitness in relation to the fitness of the wild parent (Snow et al 2003 ; Hooftman et al 2005 , 2009 ; Campbell and Snow 2007 ). However, few studies have been conducted with the aim of understanding the specific contribution of the crop and wild parents to the fitness of the hybrids, the role of the genomic locations of the genes (as for instance assessed through quantitative trait loci (QTL), Baack et al 2008 ), and the role of epistasis and genotype by environment interaction on the fitness or vigour of the hybrids.…”

Conserving Alfalfa Wild Relatives: Is Past Introgression with Russian Varieties Evident Today?

“…Domestic alleles have been shown to impact fitness in wild populations (Ellstrand, 2003; Hails and Morley, 2005). Hoc et al (2006) reported degeneration of hybrid progeny between Phaseolus vulgaris var. aborigineus and domesticated beans growing in Argentina.…”

In situ conservation of the wild relative of the common bean (Phaseolus vulgaris var. aborigineus) at the south of its neotropical distribution: environmental characterization of a population in central Argentina

“…Since its discovery in 2004, its presence was confirmed annually and collections could be deposited in germ plasm banks but it has not yet been studies that quantify the genetic difference between this population and those with Andean distribution in northwestern Argentina. However, unlike the latter populations in which exist hybridization with crops (Hoc et al 2006), in the region there are not commercial crops or primitive cultivars recorded and it is presumed that the found population is isolated and their gene pool has not received any unwanted gene flow (Drewes 2008). Moreover, the studied stretch of the Tanti stream still has some typical elements of Bosque Serrano (e.g.…”