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QTL analysis for fruit yield components in table grapes (Vitis vinifera).

G Fanizza1, F Lamaj, L Costantini

  • 1DIBCA, Genetics and Plant Breeding Unit, University of Bari, Via Amendola 165/A, 70126 Bari, Italy. fanizza@agr.uniba.it

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|July 5, 2005
PubMed
Summary

Understanding grapevine yield components is complex. Genetic analysis revealed that quantitative trait loci (QTLs) for fruit yield traits are diverse and unstable, reflecting the plant

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Area of Science:

  • Plant genetics
  • Agricultural science
  • Viticulture

Background:

  • Grapevine (Vitis vinifera) yield components are crucial for fruit production.
  • Understanding the genetic basis of these traits is essential for breeding improved varieties.

Purpose of the Study:

  • To identify quantitative trait loci (QTLs) associated with fruit yield components in table grapes.
  • To investigate the genetic architecture and correlations between yield traits.

Main Methods:

  • Utilized a segregation population of 184 table grape genotypes.
  • Employed 203 Amplified Fragment Length Polymorphism (AFLP) and 110 Simple Sequence Repeat (SSR) markers.
  • Performed phenotypic correlation and path coefficient analyses.

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Main Results:

  • Detected distinct QTLs for each fruit yield component, with low phenotypic variance explained.
  • Observed QTL instability across different years, indicating environmental influence.
  • Found no molecular support for a negative correlation between berry weight and berry number per cluster at the QTL level.

Conclusions:

  • Grapevine yield components exhibit complex genetic control influenced by perenniality and environmental variability.
  • Future research should focus on larger sample sizes and heritability to refine QTL identification for traits like seedless berry weight and cluster weight.