Tomato

Scott, John W.; Angell, F. F.

doi:10.1007/978-3-662-07822-8_20

Cited by 8 publications

(11 citation statements)

References 37 publications

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“…Heterosis has a dual influence in the breeding procedure : firstly, it enriches the cultivation categories of varieties with single-cross hybrids; commercial singlecross hybrid-varieties are often the major component of seed companies' catalogues, as for example in maize (Zea mays L. ;Troyer 1996), or in tomato (Lycopersicon esculentum Mill. ; Scott & Angell 1998).…”

Section: Introductionmentioning

confidence: 99%

“…A primary benefit is the protection of parental inbreds used in the production of elite hybrids. This is important, since there has been an increase in the involvement of private companies in tomato breeding research (Scott & Angell 1998).…”

Section: Introductionmentioning

confidence: 99%

“…Hybrids offer additional advantages when important traits are controlled by dominant genes (Kalloo 1993), which need not be fixed in all breeding lines. Examples include resistance to Fusarium wilt races 1, 2 and 3, Fusarium crown and root rot, Verticillium wilt race 1, root-knot nematodes, tobacco mosaic virus and spotted wilt virus (Scott & Angell 1998). Also, there are cases where hybrids may offer benefits that are not possible in inbred or open-pollinated varieties, as for example, the ripening inhibitor (rin) gene or the nonripening gene (nor), which in the heterozygous form can reduce postharvest damage if fruit is harvested at more mature stages of development (Tigchelaar et al 1978).…”

Section: Introductionmentioning

confidence: 99%

“…Tomatoes are heterotic for vigour, increased growth and development, earliness, yield, uniformity, or adaptability to a range of environments (Scott & Angell 1998). Several theories have been proposed to account for heterosis.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of tomato source breeding material through mating designs

2007

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SUMMARYCultivated tomato has a narrow germplasm base because of several population bottlenecks in the form of founder events, as well as natural and artificial selections that occurred during domestication and evolution of modern cultivars. The F2 of commercial single-cross hybrids, as well as locally well-adapted varieties, provide germplasm for developing recombinant lines and exploiting genetic variability, respectively. The present study aims to discriminate the breeding value of tomato source material, i.e. commercial hybrids or well-adapted varieties, by (i) estimating tolerance to inbreeding of hybrids or estimating heterosis of diallel hybrids between varieties, (ii) determining undesirable traits and (iii) determining general combining ability (GCA) and specific combining ability (SCA) effects from diallel crosses between hybrids and between varieties. Two hybrids and four varieties were assessed. One hybrid showed 0·03 inbreeding vigour, which was not combined with undesirable traits in the F2 generation. However, negative GCA and positive SCA values did not support the hybrid as source material, provided that hybrids with low inbreeding depression, positive GCA and negative SCA correspond to an F2 capable of developing recombinant lines. The assessment of the varieties showed positive GCA and 0·34 heterosis in one variety, indicating agreement between yield and GCA, and that high-yielding varieties may produce high-yielding hybrids. In conclusion, the proposed mating design, taking into account the tolerance to inbreeding for hybrids and the heritability of general worth for both resources, provides a mechanism for ensuring continued improvement in plant performance through plant selection programmes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessment of tomato source breeding material through mating designs

2007

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“…This is the most practical approach to exploiting the resistance derived from UPV16991. Currently, the tomato market is mainly based on hybrid varieties (22). Furthermore, preferred resistance genes are those which there is no need to fix in both parents (21).…”

Section: Discussionmentioning

confidence: 99%