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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
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
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.
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.