Modified synthetic varieties: a breeding method for forage crops to exploit specific combining ability

Tamaki, Hiroyuki; Yoshizawa, A.; Fujii, Hiromitsu; Sato, Koichi

doi:10.1111/j.1439-0523.2007.01280.x

Cited by 12 publications

(16 citation statements)

References 9 publications

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“…1980), alfalfa (Gau et al . 1989) and timothy (Tamaki et al . 2007) have shown that not only GCA but also SCA effects exist in their yields, and that the scale of the latter effect is as large as that of the former in alfalfa and timothy.…”

Section: Resultsmentioning

confidence: 99%

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High‐yield timothy (Phleum pratense L.) strains developed by ‘clone and strain synthesis’, a method for breeding perennial and self‐incompatible crops

Tamaki

Sato²,

Ashikaga³

et al. 2009

Grassland Science

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While breeding methods to exploit only general combining ability (GCA) have been widely adopted in perennial and self‐incompatible forage crops, maize breeders have had great success in improving maize yield by developing hybrid breeding, whereby not only GCA but also specific combining ability (SCA) can be effectively exploited. A number of trials to apply hybrid breeding to such crops have not been successful because of severe inbreeding depression and/or ineffectiveness in commercial seed production. The objective of this study was to evaluate the potential of ‘clone and strain synthesis’ (CSS), a method in which both GCA and SCA can be exploited effectively to breed perennial and self‐incompatible crops. CSS consists of two procedures: (i) harvest of syn‐1 seeds from two seed parental clones after mating of each clone with a pollen parental strain under separate, isolated conditions; and (ii) even mixing of the syn‐1 seeds to produce subsequent generations, as is done to develop conventional synthetic strains from a number of parental clones. Therefore, the yield of a strain developed by CSS depends partly on combining ability, including SCA, among the three parental materials. Fifteen timothy (Phleum pratense L.) strains were developed by CSS for verification. The productivity test results indicated that four strains in the syn‐2 had significantly higher yield levels than the commercial variety adopted as their pollen parent, suggesting the potential of CSS to breed high‐yield varieties for forage, biofuel, or other uses. Yield of the strains was applied to a diallel analysis to evaluate the relative importance of SCA toward GCA; the results suggested that SCA was important in determining yield level.

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Section: Resultsmentioning

confidence: 99%

“…One of the major reasons for this slow yield increase in forage crops is that breeders still widely apply synthetic variety development or other methods whereby only general combining ability (GCA) is effectively exploited (Tamaki et al . 2007).…”

Section: Introductionmentioning

confidence: 99%

High‐yield timothy (Phleum pratense L.) strains developed by ‘clone and strain synthesis’, a method for breeding perennial and self‐incompatible crops

Tamaki

Sato²,

Ashikaga³

et al. 2009

Grassland Science

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“…Improvement of self‐incompatible forage crops, including timothy, often relies on the production of synthetic (Syn) varieties (Tamaki et al. ). A variety developed by Syn population development in self‐incompatible forage crops originated from intercrossing a limited number of non‐inbred parents possessing high general combining ability (GCA) for specific traits (Sleper and Poehlman ).…”

mentioning

confidence: 99%

Use of molecular marker diversity to increase forage yield in timothy (Phleum pratense L.)

et al. 2012

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“…; Tamaki et al . ). The risk of severe inbreeding depression in CSS could not be shown in our limited experiments, which were conducted for only one CSS strain in one location.…”

Section: Discussionmentioning

confidence: 97%

Evaluation of forage yield performance in advanced generations of a timothy “clone and strain synthesis” strain

et al. 2013

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Clone and strain synthesis (CSS) is similar to variety synthesis to boost improvement of yield in perennial self‐incompatible forage grasses such as timothy (Phleum pratense L.). This study was undertaken to investigate the scale of inbreeding depression in advanced generations of CSS. The second to fourth synthetic generations (Syn2–4) of timothy CSS strain, ‘Kitakei 04306,’ were compared for cumulative annual dry matter yields (DMYs) and some agro‐morphological characteristics of 2009–2011. No significant difference was found among the generations for any examined characteristic, aside from a slight yield decrease (–1.7% for Syn2–4) with the advance of generations. Furthermore, DMY of Syn4, corresponding to a generation propagated as commercial seeds, remained 9.0% higher than that of its pollen parent. These results indicate the yield superiority of ‘Kitakei 04306.’ A risk of severe yield decrease in CSS could not be shown in our limited experiments.

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Modified synthetic varieties: a breeding method for forage crops to exploit specific combining ability

Cited by 12 publications

References 9 publications

High‐yield timothy (Phleum pratense L.) strains developed by ‘clone and strain synthesis’, a method for breeding perennial and self‐incompatible crops

High‐yield timothy (Phleum pratense L.) strains developed by ‘clone and strain synthesis’, a method for breeding perennial and self‐incompatible crops

Use of molecular marker diversity to increase forage yield in timothy (Phleum pratense L.)

Evaluation of forage yield performance in advanced generations of a timothy “clone and strain synthesis” strain

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