Premise Adaptive traits can be dramatically altered by genome duplication. The study of interactions among traits, ploidy, and the environment are necessary to develop an understanding how polyploidy affects niche differentiation restoration strategies for resilient native ecosystems. Methods Growth fecundity were measured in common gardens 39 populations big sagebrush (Artemisia tridentata) co...

Different explants from diploid and tetraploid plants of Arabidopsis thaliana ecotype Wilna were cultured in vitro on the same medium in the same conditions. The mode and capacity for regeneration and the ploidy level of regenerants were examined in eight callus lines. The explant responses to in vitro conditions depended on the ploidy level of donor plants and on the type of explant. Callus de...

Autopolyploid plants and their organs are often larger than their diploid counterparts, which makes them attractive to plant breeders. Mulberry (Morus alba L.) is an important commercial woody plant in many tropical and subtropical areas. In this study, we obtained a series of autotetraploid mulberry plants resulting from a colchicine treatment. To evaluate the effects of genome duplications in...

NTENSE gamma-radiation of conidia has been found to produce a very high I frequenc y of abnormal, sectoring colonies in heterozygous diploids of Aspergillus nidulans (=FER 1960). To obtain information about the nature of the radiation effects which cause the formation of colonies with many large segregant sectors, a detailed analysis of a relatively small number of such sectoring colonies has b...

A gene encoding phospholipase D (PLD) in Saccharomyces cerevisiae was identified. The 195 kDa product of PLD1 has 24% overall sequence identity with a plant PLD. Expression of yeast PLD activity was eliminated by one-step gene disruption. Yeast haploids lacking PLD activity were deficient in growth on non-fermentable carbon sources. Diploids lacking expression of PLD1 were unable to sporulate.