title: Relationship between polyploidy and pollen self-incompatibility phenotype in Petunia hybrida Vilm.
abstract: Self-incompatibility in Solanaceae is controlled by a single multiallelic locus, the S-locus. The S-allele associated ribonucleases (S-RNases) in the pistil are involved in pollen rejection. In this work, we analyzed two newly isolated lines of Petunia hybrida, termed PB and PF. They both had the same set of S-RNases (SB1- and SB2-RNases), however the PB was a self-incompatible diploid while PF was a self-compatible tetraploid. Cross pollination tests between PB and PF indicated diploid pollen from PF lost the incompatibility phenotype. In order to clarify the effects of polyploidy on pollen phenotypic change, we artificially induced tetraploid plants from a diploid SB1SB2 heterozygote (= PB) and a diploid SB1SB1 homozygote. The obtained SB1 SB1SB1SB1 homoallelic tetraploid remained self-incompatible, whereas the SB1SB1SB2SB2 heteroallelic tetraploid became self-compatible. These data suggested that the diploid heteroallelic pollen lost the incompatibility phenotype and had the characteristics of self-compatibility with SB1SB2 style.
authors.affiliation: Graduate School of Biological Sciences, Nara Institute of Science and Technology, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Entani
authors.forename: S
authors.initials: S
authors.lastname: Takayama
authors.forename: M
authors.initials: M
authors.lastname: Iwano
authors.forename: H
authors.initials: H
authors.lastname: Shiba
authors.forename: F S
authors.initials: FS
authors.lastname: Che
authors.forename: A
authors.initials: A
authors.lastname: Isogai
mesh_terms: D000483:Alleles; D000595:Amino Acid Sequence; D003433:Crosses, Genetic; D004171:Diploidy; D006023:Glycoproteins / Q000235:genetics; D006720:Homozygote; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000737:chemistry; D010641:Phenotype; D011058:Pollen / Q000201:enzymology / Q000235:genetics*; D011123:Polyploidy; D012260:Ribonucleases / Q000737:chemistry / Q000235:genetics*; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D019657:Solanaceae / Q000201:enzymology / Q000235:genetics* / Q000502:physiology
chemical_list: D006023:Glycoproteins; D010446:Peptide Fragments; D012260:Ribonucleases; C022542:ribonuclease S