|Authors: ||J. Stenger, H. Hatterman-Valenti|
|Keywords: ||Vitis, interaction, Tucker, temperature, cold-climate, environment, response|
Three cold-climate winegrape cultivars ('Frontenac Gris', 'Marquette' and 'St.
Croix') were investigated for environmental effects on fall-acclimation and fruit ripening.
Twelve measures were taken at five photoperiodic times under five environments.
Mean values were used to reduce the 3×12×5×5 four-way interaction to 2×5×4×4 while retaining 90.70% of the initial variation using the Tucker model.
Additionally, the interaction among three temperature parameters at each site measured for a 40-day period was reduced to dimensions of 2×2×3 while retaining 94.71% of the total variance.
Two significant correlations were found among the phenotypic and temperature derived environmental axes, one of which included high contributing axes of either dataset.
Temperature increases were associated with relative increases in active growth and berry ripening in 'Marquette' compared with other cultivars.
Temperature declines early in the fall were associated with reduced berry growth, increased periderm development and increased berry ripening rate in 'St.
Croix' relative to other cultivars. 'Frontenac Gris' had moderated responses in comparison with the other two cultivars.
Overall, it is speculated that relative differences in reaction relate to symplasmic unloading restriction to differing tissues of differing vines.
The uncompromising progress in bud maturation relative to other cultivars likely aids in the reliability of 'Frontenac Gris' in the United States Northern Plains region relative to other cultivars, while the relative ability of 'Marquette' to return to active growth upon temperature increase may contribute to its relative unpredictability in year-to-year performance.
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