TRIPLOID × DIPLOID PROGENIES AND THE PRIMARY TRISOMICS OF <i>ANTIRRHINUM MAJUS</i>

Sampson, D. R.; Hunter, A. W. S.; Bradley, E. C.

doi:10.1139/g61-022

Cited by 22 publications

(4 citation statements)

References 5 publications

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“…One hypothesis, put forward By Goodspeed and Avery (1939), assumed that the physiological action of a chromosome as a whole could account for the characters of a trisomic type varying from a diploid in the same direction. According to the other hypothesis different characters might reflect the same genetic processes and were, therefore, influenced by the same genes (Sampson, Hunter and Bradley, 1961). 'The present results are better explained on the basis of first hypothesis since the characters showing correlated variation are many, and the idea that all of them would be influenced by the same genes is inconceivable.…”

Section: Imentioning

confidence: 46%

Primary Simple Trisomics in Pearl Millet

Gill¹,

Virmani²,

Minocha³

1970

Can. J. Genet. Cytol.

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To establish a series of trisomics in Pennisetum typhoides (2n = 14), plants with 2n + 1 chromosome numbers were isolated from the progenies of triploid plants and triploid-diploid crosses. These primary simple trisomic plants were distinguishable from the diploids by their relatively poor vigour, short height, narrow leaves and late flowering. They were also distinguishable from one another and were classified into seven morphological groups: 'Tiny', 'Dark Green', 'Lax', 'Slender', 'Spindle', 'Broad' and 'Pseudonormal'. The extra chromosome in the seven trisomic types could be distinguished on the basis of somatic chromosome morphology.

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Section: Imentioning

confidence: 46%

Primary Simple Trisomics in Pearl Millet

Gill¹,

Virmani²,

Minocha³

1970

Can. J. Genet. Cytol.

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“…Support for this theory was presented by Sinnot et al (1934), who found a good fit between the mean of all trisomics and disomic mean for most of the characters studied. However, the theory of genic balance, as was pointed out by Sampson et al (1961), ignores additive and optimum gene actions as well as epistatic and compensating genes on other chromosomes. Contrary to Datura, the mean of all the Antirrhinum trisorfiics deviated in the minus direction from the disomic mean in all but one of the characters studied (Sampson et al.…”

Section: Transmission Ofthe Trisornementioning

confidence: 99%

TRISOMICS OFAVENA STRIGOSA

Rajhathy¹

1975

Can. J. Genet. Cytol.

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A set of seven primary trisomics and seven derived types were produced in Avena srrigosa Schreb., a diploid oat species. Each trisomic type had a distinct phenotype. The primary trisomics were identified on the basis of plant and chromosome morphology. Although fertility (seed-set) and the frequency of transmission of the extra chromosome varied among selfed progenies of the various trisomics, each trisomic can be maintained. The trisomics occurred at a higher frequency in small seed fractions than in samples of large seeds. No straightforward relationship was apparent between chromosome length and trivalent formation but some association between trivalent formation and transmission rate was observed.Several qualitative and quantitative traits were compared between the primary telotrisomics, between these and the disomic and between opposite arm telotrisomics and their corresponding primary trisomic. It was concluded that the results are more compatible with dosage effects than with the gene balance theory.

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“…In comparison with the diploid mother line phenotype, specific characters are exaggerated in some trisomies and reduced in other; this is in line with BRIDGES' ( 1921) theory of the genic balance according to which the diploid phenotype results from the equilibrium among a large number of genes acting with different tendencies. In higher plants, these opposite tendencies have been found in the trisomies of several species, namely Datura (SINNOT et al 1934 ), Nicotiana (GooDSPEED et al 1939), Anthirrhinum (SAMPSON et al 1961) and LoTus (CHEN et al 1968). Although no quantitative analysis has been performed, it seems that positive correlations exist among the changes of different organs in some of our trisomies.…”

Section: Resultsmentioning

confidence: 99%