Some Further Studies of Incompatibilities in Petunia axillaris

Kojan, Selma

doi:10.2307/2482270

Cited by 7 publications

(1 citation statement)

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“…According to Mather (1943), P. axillaris is self-compatible, but other researchers have described it to be self-incompatible (Kojan 1950;Shivanna and Rangaswamy 1969;Bali 1971;Rangaswamy and Shivanna 1971a,b). This discrepancy has recently been resolved.…”

Section: And R O L E S : Tatsuya Tsukamoto · Toshio Ando · Hisashi Kokumentioning

confidence: 99%

Breakdown of self-incompatibility in a natural population of Petunia axillaris (Solanaceae) in Uruguay containing both self-incompatible and self-compatible plants

Tsukamoto¹,

Ando²,

Kokubun³

et al. 1999

Sexual Plant Reproduction

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Many members of the Solanaceae display a type of gametophytic self-incompatibility which is controlled by a single multiallelic locus, called the S-locus. From our previous survey of more than 100 natural populations of Petunia axillaris (a solanaceous species) in Uruguay, we had found that the majority of the populations of subspecies axillaris were comprised of virtually all self-incompatible individuals. The rest were "mixed populations" which contained mostly self-incompatible and some self-compatible individuals. In this study, we examined the self-incompatibility behavior and determined the S-genotypes of 33 plants raised from seeds obtained from one such mixed population, designated U1. We found that 30 of the 33 plants (designated U1-1 through U1-33) were self-incompatible and a total of 18 different S-alleles were represented. To determine the Sgenotypes of the three self-compatible plants (U1-2, U1-16, and U1-22) and the possible causes for the breakdown of their self-incompatibility, we carried out reciprocal crosses between each of them and each of the 18 S-homozygotes (S 1 S 1 through S 18 S 18 ) obtained from bud-selfed progeny of 14 of the 30 self-incompatible plants. For U1-2 and U1-16, we also carried out additional crosses with U1-25 (with S 1 S 13 genotype) and an S 13 S 15 plant (obtained from a cross between an S 13 -homozygote and an S 15 -homozygote), respectively. Based on all the pollination results and analysis of the production of S-RNases, products of S-alleles in the pistil, we determined the S-genotypes of U1-2, U1-16, and U1-22, and propose that the breakdown of self-incompatibility in these three plants is caused by suppression of the production of S 13 -RNase from the S 13 -allele they all carry. We have termed this phenomenon "stylar-part suppression of an S-allele" or SPS.& k w d : Key words Petunia axillaris · Self-incompatibility · Self-compatibility · Stylar-part suppression& b d y :

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Section: And R O L E S : Tatsuya Tsukamoto · Toshio Ando · Hisashi Kokumentioning

confidence: 99%

Breakdown of self-incompatibility in a natural population of Petunia axillaris (Solanaceae) in Uruguay containing both self-incompatible and self-compatible plants

Tsukamoto¹,

Ando²,

Kokubun³

et al. 1999

Sexual Plant Reproduction

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Genetics of Self‐incompatibility in Physalis Ixocarpa Brot.—a New System

Pandey

1957

American J of Botany

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SOLANACEAE WAS the first family in which the genetics of self-incompatibility was properly understood. The oppositional or personate system of self-incompatibility was first described, with substantiating data, by East and Mangelsdorf (1925) for Nicotiana species. Later, work on different species of Petunia (Harland and Atteck, 1933) and Solanum (Pal and Pushkarnath, 1942) also revealed the same oppositional system of self-incompatibility. Similarily in the families in which more than one genus was investigated, the same system was found operating in the different genera of the same family (e. g.; in the genera Antirrhinum, N emesia and Veronica of the Scrophulariaceae). From these observations in one or a few genera of each family, various authors concluded that only one system of self-incompatibility was prevalent in one family. The discovery of a new system of selfincompatibility in three genera of Compositae (Parthenium-Gerstel 1950; Crepis-Houghes andBabcock 1950, and Cosmos-Crowe 1954a) and Cruciferae i I beris, Brassica and Raphanus-Bateman 1955) strengthened this belief. The recent findings of another system of self-incompatibility in the 3 genera investigated (Secale cereale-Lund· quist 1954; Festuca pratensis-Lundquist 1955; Phalaris coerulescens-Hayman 1956) in the family Gramineae also seems to confirm this. However, the latest discovery in Trifolium uniflorum (Pandey 1957a) of a new S locus which is non-allelic to the S genes found in other Trifolium species suggests that there may be important deviations from the system in the same Iamilv.Menzel (1951), working with a number of Physalis species (Solanaceae), found no evidence of self-incompatibility. However, she reported that hr.,gged flowers of P. ixocarpa Brot. (= P. aeguata Jacq, and P. capscicifolia Rydb.) and P. viscosa tii.l not set fruit, whereas a number of other species set abundant fruits with normal or near normal number of seeds under the same conditions.Preliminarv selfing experiments with a few plants of P. ixocaroa grown in the greenhouse in the summer of 1955 revealed that this species is highly self-incompatible. A study of the 'genetics of self-1

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