Inbreeding and true seed in tetrasomic potato. I. Selfing and open pollination in Andean landraces (Solanum tuberosum Gp. Andigena)

Pollen quality for pollinators tracks pollen quality for plants in Mimulus guttatus

“…Thus, for Mimulus guttatus, and likely other plant species in which conditions can bring about developmental failure in substantial amounts of pollen, conditions that reduce pollen viability may substantially reduce the value of plants for their pollinators. One environmental condition that is both increasingly common and relevant is habitat fragmentation; many studies have shown that habitat fragmentation reduces plant population sizes and increases inbreeding (Ellstrand andElam 1993, Schleuning et al 2009), and inbreeding is commonly associated with reduced pollen viability (Carr and Dudash 1997, Golmirzaie et al 1998, Melser et al 1999, Murren 2002. It remains to be seen whether the relationship described here also occurs when pollen viability is reduced after development is mostly complete, such as when pollen is exposed to pollution after anthesis (Pasqualini et al 2011, Duro et al 2013.…”

“…Reduced viability is often associated with processes such as hybridization and inbreeding (Carr and Dudash 1997, Golmirzaie et al 1998, Melser et al 1999, Busch 2005, Glaettli and Goudet 2006, Eppley and Pannell 2009, Bures et al 2010, or environmental stress such as exposure to high temperature or pollutants (Handique and Baruah 1995, Tretyakova et al 1996, Gottardini et al 2008, Pasqualini et al 2011.…”

Evolution towards self‐compatibility when mates are limited

“…Hence, multiple generations of selfing would constrain the spread of SC. Empirical measures of ID in tetraploids based on more than one generation of selfing are scarce, although Golmirzaie et al. (1998) reported what appear to be linear declines in (relative) fitness components over two generations of selfing in tetraploid potatoes.…”

“…Hence, multiple generations of selfing would constrain the spread of SC. Empirical measures of ID in tetraploids based on more than one generation of selfing are scarce, although Golmirzaie et al (1998) reported what appear to be linear declines in (relative) fitness components over two generations of selfing in tetraploid potatoes. Alternative explanations for the general rarity of SC in this study include environment-dependence of ID (Armbruster & Reed, 2005), although estimates of ID in R. reptans have proven robust under stressful interspecific competition (Willi et al, 2007a).…”

Polyploidy and Plant Breeding

“…TPS hybrids from crosses between tetraploid parents are the most popular for potato production from true seed, but the cheapest materials derive from open pollination (OP) because labor skills and other required investments are small for its production. OP seed result from selfing and outcrossing in male-fertile tetraploid potatoes (Golmirzaie et al 1998a). Although TPS hybrids often outyield OP and selfed offspring, tuber yield does not always decrease after several OP generations are derived from heterogeneous true seed offspring (Golmirzaie et al 1998b), because the level of heterozigosity in the tetraploid sporophyte affects the phenotypic expression of the diploid gamethophytic generation in potato .…”