terclim by ICS banner
IVES 9 IVES Conference Series 9 GiESCO 9 GiESCO 2023 9 Comparison of genotype x environment interaction of clonal and polyclonal grapevine selected materials

Comparison of genotype x environment interaction of clonal and polyclonal grapevine selected materials


Context and purpose of the study – Conserving and exploring the intra-varietal diversity of ancient varieties is essential to foster their use in the future, preserving the traditions and history of ancient growing regions and their wines. The conservation of representative samples of ancient varieties and the utilization of intra-varietal variability through polyclonal selection are advisable strategies to save and promote the cultivation of each variety, respectively. These processes allow perform several types of polyclonal selection according to different criteria over time, to face the demands of producers, consumers, and climate changes; and to ensure a stable behaviour of the variety among the environments where it is grown. The objective of this study is to demonstrate the higher flexibility of selection criteria and precision associated with the genetic gains of polyclonal selection as well as its higher stability in different environments.

Material and methods  – Linear mixed models were fitted to the data of yield and important quality traits of the must obtained in several multi-environmental field trials established according to randomized complete blocks and resolvable row-column designs. Some methodologies for the comparison between clonal and polyclonal selections are used. Particularly, methods to evaluate and demonstrate the more stable behaviour of the polyclonal material over environments are considered, using a measure based on the variance of the values of the empirical best linear unbiased predictors (EBLUPs) of G×E interaction effects of the polyclonal group across environments and biplots for the interpretation of genotype by environment (G×E) interaction.

Results – The results showed the higher precision of the genetic gains of the polyclonal selected group. When compared to individual clones, the lower sensitivity to G×E interaction of the polyclonal material was always observed. The polyclonal selection of ancient grapevine varieties showed to be a powerful tool to face current and future challenges of viticulture.


Publication date: June 20, 2023

Issue: GiESCO 2023

Type: Article



1LEAF—Linking Landscape, Environment, Agriculture and Food—Research Center, Associated Laboratory TERRA, Instituto Superior de Agronomia, Universidade de Lisboa, Lisboa, Portugal

Contact the author*


intra-varietal diversity, grapevine conservation, polyclonal selection


GiESCO | GIESCO 2023 | IVES Conference Series


Related articles…

Physiological and growth reaction of Shiraz/101-14 Mgt to row orientation and soil water status

Advanced knowledge on grapevine row orientation is required to improve establishment, management and outcomes of vineyards on terroirs with different environmental conditions (climate, soil, topography) and in view of a future change to more extreme climatic conditions. The purpose of this study was to determine the combined effect of row orientation, plant water status and ripeness level on the physiological and viticultural reaction of Shiraz/101-14 Mgt.

Effects of mechanical leafing and deficit irrigation on Cabernet Sauvignon grown in warm climate of California

San Joaquin Valley accounts for 40% of wine grape acreage and produces 70% of wine grape in California. Fruit quality is one of most important factors which impact the economical sustainability of farming wine grapes in this region. Due to the recent drought and expected labor cost increase, the wine industry is thrilled to understand how to improve fruit quality while maintaining the yield with less water and labor input. The present study aims to study the interactive effects of mechanical leafing and deficit irrigation on yield and berry compositions of Cabernet Sauvignon grown in warm climate of California.

The effects of cane girdling on berry texture properties and the concentration of some aroma compounds in three table grape cultivars

The marketability of the table grapes is highly influenced by the consumer demand; therefore the market value of the table grapes is mainly characterized by its berry size, colour, taste and texture. Girdling could cause accumulation of several components in plants above the ringing of the phloem including clusters and resulting improved maturity. The aim of the experiments was to examine the effect of girdling on berry texture characteristics and aroma concentration.

Application of a fluorescence-based method to evaluate the ripening process and quality of Pinot Blanc grape

The chemical composition of grape berries at harvest is one of the most important factors that should be considered to produce high quality wines. Among the different chemical classes which characterize the grape juice, the polyphenolic compound, such as flavonoids, contribute to the final taste and color of wines. Recently, an innovative non-destructive method, based on chlorophyll fluorescence, was developed to estimate the phenolic maturity of red grape varieties through the evaluation of anthocyanins accumulated in the berry skin. To date, only few data are available about the application of this method on white grape varieties.

Different yield regulation strategies in semi-minimal-pruned hedge (SMPH) and impact on bunch architecture

Yields in the novel viticulture training system Semi-Minimal-Pruned Hedge (SMPH) are generally higher compared to the traditional Vertical Shoot Positioning (VSP). Excessive yields have a negative impact on the vine and wine quality, which can result in substantial losses in yield in subsequent vintages (alternate bearing) or penalties in fruit quality. Therefore yield regulation is essential. The bunch architecture in SMPH differs from VSP. Generally there is a higher amount but smaller bunches with lower single berry weights in SMPH compared to VSP.