The Inheritance of Doubleness in Matthiola and Petunia. I. The Hypotheses

Inheritance of the Double-flowered Trait in Decorative Hydrangea Flowers

“…In Matthiola incana (L.) R. BR, the segregation ratio of flower types differs among lines of the same species (Frost, 1915). The single-flowered trait is a dominant characteristic controlled by a single major gene in a stock line.…”

Evidence for Irregularity in Crossing Over of the S Locus in the Eversporting Type of Matthiola Incana (L.) R. Br

“…Furthermore, by this hypothesis the commonly observed lower vigor of the singles than of the doubles in eversporting lines (SAUNDERS 1911;FROST 1915) could be explained logically as a consequence of the singles only carrying the lethal factor. WINGE (1931) presented evidence which was interpreted to show that linkage between S and 1 is not complete.…”

“…Objections to this theory which more recently have been adequately discussed by WINGE (1931) and KAPPERT (1937) led to the proposal of the pollen lethal hypothesis by GOLDSCHMIDT (1913) and FROST (1915). According to FROST'S interpretation of that hypothesis single versus double flower form in the normal heterozygous type of Matthiola incana is governed by one gene pair Ss, whereas in the eversporting type the singleness gene S either has mutated to the lethal allele S1 or a lethal factor at another locus is so closely linked with S that crossing over is not known to take place between them.…”

Über die Trabantenchromosomen bei normalen und immerspaltenden Sippen vonMatthiola incana

“…Zur Erkl~rung Wurde angenommen, dab der Einfachfaktor bei den Immerspaltern (----S') im Pollen entweder letal wirkt (GOLDSCttMIDT 1913, BELLI~C 1915 oder stets in s mutiert (,,konvertiert", WI~KLER 1930, S. 129/130). Das Zutreffen der Letaliti~tserkli~rung wurde zwar schon durch die Pollenkeimungsuntersuchungen von W. ~DDII~C~TON (1929) wahrscheinlich gemacht, aber erst neuerdings yon Ku~Ih" (1935 (FROST 1915, KVASNIKOV 1929, KAPPE~T 1937 ; diese geringere Vitalit~t l~t sich auch schon bei den Samen nachweisen, ~us denen sie hervorgehen (NoBBE 1888, SAU~DERS 1915, KAePERT 1937). Die Immerspaltenden entwickeln sich langsamer, was sich z.…”