Characteristics of 2N pollen producing triploid hybrids betweenSolanum stoloniferum and cultivated diploid potatoes

Abstract

Segregants which produce 2n pollen were identified inSolanum stoloniferum and hybridized with 2n pollen producing cultivated diploids. A number of the resulting triploids produced 2n pollen, ranging from less than 1 up to 7.6%. Parallel spindles at Anaphase II were shown to be the probable meiotic mechanism responsible for 2n pollen production. Thus the genetic consequences are equivalent to first division restitution. This 2n pollen produced by triploids should facilitate transfer of genes from wild allotetraploids to cultivated tetraploids. There should be increased gene exchange between nonhomologous wild and cultivated genomes during microsporogenesis of the triploids. This methodology should have merit in crosses with allotetraploid species in the Series Longipedicellata and Acaulia.

Compendio

Se identificaron segregantes que producen polen 2n enSolanum stoloniferum y se hibridaron con diploides cultivados productores de polen 2n. Varios de los triploides resultantes produjeron polen 2n, en un rango de menos de 1 hasta 7,6%. Usos paralelos en la Anafase II mostraron ser el mecanismo meiótico probablemente responsable de la producción de polen 2n. Asi, las consecuencias genéticas son equivalentes a la restitución de primera division. Este polen 2n producido por los triploides habrá de facilitar la transferencia de genes de alotetraploides silvestres a tetraploides cultivados. Por lo tanto será incrementado el intercambio entre genomas silvestres no homólogos y aquellos cultivados, en la microsporogenesis de los triploides. Esta metodología será valiosa en cruzamientos con especies alotetraploides en las Series Longipedicellata y Acaulia.