The yield and competitive ability of euploid and aneuploid genotypes of tetraploid Lolium perenne in two seasons at two locations

Norrington-Davies, J.; Moore, Kelly; Blijenburg, J. G.

doi:10.1007/bf00038796

Cited by 4 publications

(6 citation statements)

References 6 publications

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“…In earlier experiments similar general conclusions on the limited role of aneuploids in dense stands of induced autotetraploids have been reported (Barcley and Armstrong 1966;Ellerstrom and Sjodin 1966;Norrington-Davies et al 1981). Aneuploids produce higher aneuploid frequencies in their progeny than euploid tetraploids and a gradual increase in the frequency of aneuploids in a population may at some point become undesirable even in normally aneuploid-tolerant crops.…”

Section: Reduced Fertility and Segregation Of Aneuploidssupporting

confidence: 68%

Cytogenetics in Plant Breeding

Sybenga

1992

Monographs on Theoretical and Applied Genetics

109

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Section: Reduced Fertility and Segregation Of Aneuploidssupporting

confidence: 68%

Cytogenetics in Plant Breeding

Sybenga

1992

Monographs on Theoretical and Applied Genetics

109

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“…In the same investigation, the alpha-competition was estimated (NORRINGTON-DAVIES et al 1981). They showed that hyperploids were the best competitors, euploids had average competitive ability and the hypoploids had low competitive ability.…”

Section: Discussionmentioning

confidence: 98%

“…NORRINGTON- DAVIES et al (1981) investigated 6 genotypes of induced autotetraploid Lolium perenne consisting of high and low yielding selection from material with 27,28 and 29 chromosomes. The authors showed that euploid stands yielded more than the aneuploid stands in their respective pure stand.…”

Section: Discussionmentioning

confidence: 99%

“…This investigation also included studies of the dry matter production in pure stands and in mixtures. NORRINGTON-DAVIES et al (1981) investigated selected euploid and aneuploid genotypes from an autotetraploid population of Lolium perenne. The authors found the performance of the plants in the mixtures intermediate to those of the pure stands.…”

Section: Ismentioning

confidence: 99%

“…However, it has been demonstrated that the performance of grass plants in spaced trials is poorly correlated with the performance in sward conditions (VAN DIJK and WIN-KELHORST 1978;HAYWARD and VIVERO 1984). Studies on induced autotetraploid populations have indicated that the yield reductions in dense swards are lower than would have been expected from the yielding behaviour of the plants when grown under spaced conditions (ELLERSTROM and S J~D I N 1974;NORRINGTON-DAVIES et al 1981;BARCLAY and ARMSTRONG 1966). KLINGA (1987) studied the performance of plants at different sowing densities in a perennial sward of autotetraploid Festuca pratensis.…”

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confidence: 99%

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Aneuploidy in induced autotetraploid populations ofFestuca pratensis, Lolium multiflorum, and Lolium perenne IV. Competitive interactions between euploid and aneuploid plants in a simulated perennial sward of tetraploid Festuca pratensis

Klinga

2008

Hereditas

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Klinga, K. 1987. Aneuploidy in induced autotetraploid populations of Festuca pratensis, Lolium muitiflorum, and Lolium perenne. IV. Competitive interactions between euploid and aneuploid plants in a simulated perennial sward of tetraploid Festuca pratensis. —Hereditas 107 249–256. Lund, Sweden. ISSN 0018–0661. Received August 5,1987 The competitive interactions in dense perennial stands of autotetraploid Fesruca pratensis were investigated by studying the following factors: (a) the persistence of euploid and aneuploid plants in pure stands and in mixtures; (b) the productivity of the persisting euploid and aneuploid plants in pure stands and mixtures; (c) the dry yield per unit area in the different kinds of growing regimes. About 80 % of the original euploid plants in the mixtures and about 50 % in the pure stands were left at the end of the experiment. The persistence of aneuploids did not differ between the two growing regimes. The aneuploid frequency changed from about 30 % to 20 % during the experimental period. In terms of persistence the euploids were better competitors, displayed by the significantly higher persistence in the mixtures. The yielding capacity and the competitive ability of individual euploids in the mixtures exceeded the aneuploids the year of planting and the first summer of the sward development. Later, the yielding capacity did not differ between the two chromosome categories. The negative agressivity values in the last year of the sward indicated a better competitive ability of the aneuploid plants. The presence of aneuploids in the mixed stands did not cause any conspicuous loss of yield. This was displayed by the lack of significant differences in the dry yield per unit area between the two kinds of stands.

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Phenotypic Stability of Mixtures – Relations Between the Stability Parameters of a Mixture and Its Components

Hühn

1987

Biometrical J

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For each of the two stability parametere ('regreasion coefficient' and 'sum of squared deviatiom from the regression') of the common regreasion approach ( = r e g m i o n of the yield of population i in environment j on the environmental index of this evironment j which often has been estimated by the mean of all tested populatione in this environment j) the phenotypic stability of a mixture and it's components have been analyeed theoretically. It can be shown that in practical applicationa (for example: variety teeting) the regression coefficient of a mixture often can be sufficiently approximated by the arithmetic mean of the regression coefficients of the componentg grown singly. This simple relation between a mixture and it's components don't hold for the second stability parameter 'sum of squared deviations from the regression'. The exact relation has been deduced and useful and clear approximations are discussed. All the theoretical resulta are demonstrated and applied using the well-known experimental barley data of SANDFAEB (1970).

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The yield and competitive ability of euploid and aneuploid genotypes of tetraploid Lolium perenne in two seasons at two locations

Cited by 4 publications

References 6 publications

Cytogenetics in Plant Breeding

Cytogenetics in Plant Breeding

Aneuploidy in induced autotetraploid populations ofFestuca pratensis, Lolium multiflorum, and Lolium perenne IV. Competitive interactions between euploid and aneuploid plants in a simulated perennial sward of tetraploid Festuca pratensis

Phenotypic Stability of Mixtures – Relations Between the Stability Parameters of a Mixture and Its Components

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