Age-related changes in the expression of QTLs for growth in radiata pine seedlings

Emebiri, Livinus; Devey, M. E.; Matheson, A. C.; Slee, M. U.

doi:10.1007/s001220050991

Cited by 46 publications

(33 citation statements)

References 22 publications

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“…have found year-to-year QTL effects to be inconsistent (Plomion et al 1996;Emebiri et al 1998;Kaya et al 1999). Given these findings, the consistency of effects we observed at the LG1 and LG8 QTLs, and at the loci on LG3 and LG12 to a lesser extent, is noteworthy.…”

Section: Role Of Major Loci In Inbreeding Depressionsupporting

confidence: 73%

Evaluation of Major Genetic Loci Contributing to Inbreeding Depression for Survival and Early Growth in a Selfed Family of Pinus Taeda

Remington

O’Malley

2000

Evolution

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Abstract. The magnitude of fitness effects at genetic loci causing inbreeding depression at various life stages has been an important question in plant evolution. We used genetic mapping in a selfed family of loblolly pine (Pinus taeda L.) to gain insights on inbreeding depression for early growth and viability. Two quantitative trait loci (QTLs) were identified that explain much of the phenotypic variation in height growth through age 3 and may account for more than 13% inbreeding depression in this family. One of these QTLs maps to the location of cad-n1, a lignin biosynthesis mutation. Both QTLs show evidence of overdominance, although evidence for true versus pseudooverdominance is inconclusive. Evidence of directional dominance for height growth was noted throughout the genome, suggesting that additional loci may contribute to inbreeding depression. A chlorophyll-deficiency mutation, spf, did not appear to be associated with growth effects, but had significant effects on survival through age 3. Previously identified embryonic viability loci had little or no overall effect on germination, survival, or growth. Our results challenge, at least in part, the prevailing hypothesis that inbreeding depression for growth is due to alleles of small effect. However, our data support predictions that loci affecting inbreeding depression are largely stage specific.

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Section: Role Of Major Loci In Inbreeding Depressionsupporting

confidence: 73%

Evaluation of Major Genetic Loci Contributing to Inbreeding Depression for Survival and Early Growth in a Selfed Family of Pinus Taeda

Remington

O’Malley

2000

Evolution

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“…The proportion of this kind of QTL is especially impressive in fruit and forest tree species (Ası´ns et al 1994, Conner et al 1998, Emebiri et al 1998, Garcia et al 2000. Selection pressure on phenotypic plasticity has to be stronger on perennials than on annuals.…”

Section: A S I´n Smentioning

confidence: 99%

Present and future of quantitative trait locus analysis in plant breeding

2002

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The joint analysis of genotype marker segregation and phenotypic values of individuals or lines enables the detection and location of loci affecting quantitative traits (QTL). The availability of DNA markers and powerful biometric methods has led to considerable progress in QTL mapping in plants.The most obvious applications of QTL analysis seem to be marker-assisted selection (MAS) in breeding and pre-breeding and QTL cloning. However, other areas are envisaged where QTL analysis can contribute decisively. These are: the understanding of complex traits such as plant-pathogen interaction; plant genomics, connecting proteins and regulatory elements of known functions to QTL by candidate gene analysis; and germplasm enhancement through a characterization that allows its efficient utilization. The success in all these applications depends primarily on the reliability and accuracy of the QTL analysis itself. Therefore, the discussion of its limitations will constitute an important part of this review.

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“…GenotypeÂenviron-ment interactions are another important aspect that has to be taken into account when trying to verify the relevance of identified QTLs. QTLs whose expression differs across environments seem to be the rule rather than the exception in tree species (Asíns et al, 1994;Emebiri et al, 1998;García et al, 2000). Concerning the influence of growth characteristics of the host plant on resistance to aphid infestation, the effects of neighbouring tree infestation levels and/or different climatic conditions at the experimental site may impede the identification of genetically based resistance (Stoeckli et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Co-localisation of host plant resistance QTLs affecting the performance and feeding behaviour of the aphid Myzus persicae in the peach tree

Lambert

Pascal

2011

Heredity

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The architecture and action of quantitative trait loci (QTL) contributing to plant resistance mechanisms against aphids, the largest group of phloem-feeding insects, are not well understood. Comparative mapping of several components of resistance to the green peach aphid (Myzus persicae) was undertaken in Prunus davidiana, a wild species related to peach. An interspecific F 1 population of Prunus persica var. Summergrand Â P. davidiana clone P1908 was scored for resistance (aphid colony development and foliar damage) and 17 aphid feeding behaviour traits monitored by means of the electrical penetration graph technique. Seven resistance QTLs were detected, individually explaining 6.1-43.1% of the phenotypic variation. Consistency was shown over several trials. Nine QTLs affecting aphid feeding behaviour were identified. All resistance QTLs except one co-located with QTLs underlying aphid feeding behaviour. A P. davidiana resistance allele at the major QTL was associated with drastic reductions in phloem sap ingestion by aphids, suggesting a phloem-based resistance mechanism. Resistance was also positively correlated with aphid salivation into sieve elements, suggesting an insect response to restore the appropriate conditions for ingestion after phloem occlusion. No significant QTL was found for traits characterising aphid mouthpart activity in plant tissues other than phloem vessels. Two QTLs with effects on aphid feeding behaviour but without effect on resistance were identified. SSR markers linked to the main QTLs involved in resistance are of potential use in marker-assisted selection for aphid resistance. Linking our results with the recent sequencing of the peach genome may help clarify the physiological resistance mechanisms.

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Age-related changes in the expression of QTLs for growth in radiata pine seedlings

Cited by 46 publications

References 22 publications

Evaluation of Major Genetic Loci Contributing to Inbreeding Depression for Survival and Early Growth in a Selfed Family of Pinus Taeda

Evaluation of Major Genetic Loci Contributing to Inbreeding Depression for Survival and Early Growth in a Selfed Family of Pinus Taeda

Present and future of quantitative trait locus analysis in plant breeding

Co-localisation of host plant resistance QTLs affecting the performance and feeding behaviour of the aphid Myzus persicae in the peach tree

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