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Grapevine rootstocks affect growth-related scion phenotypes.
Zoë Migicovsky1, Peter Cousins2, Lindsay M Jordan3
1Department of Plant, Food and Environmental Sciences Faculty of Agriculture Dalhousie University Truro NS Canada.
Plant Direct
|June 7, 2021
Summary
Choosing the right grapevine rootstock significantly impacts grape production. Optimal rootstock selection can increase yield, pruning weight, and the Ravaz index by over 50%, crucial for growers.
Area of Science:
- Viticulture and Plant Science
- Agricultural Engineering
- Genetics and Breeding
Background:
- Grapevine rootstocks are essential for pest/pathogen resistance and managing viticulture performance, including shoot growth.
- Rootstock selection influences key agronomic traits in grape cultivation.
Purpose of the Study:
- To determine the effect of 15 different rootstocks on eight key viticulture traits for 'Chardonnay' and 'Cabernet Sauvignon' scion varieties.
- To quantify the impact of rootstock choice on grape yield and vine performance over a five-year period.
Main Methods:
- Grafted two grapevine scion varieties ('Chardonnay', 'Cabernet Sauvignon') onto 15 distinct rootstocks.
- Assessed eight viticulture traits, including yield, pruning weight, berry weight, and Ravaz index, over five years.
- Analyzed trait variation attributed to year, scion variety, and rootstock.
Main Results:
- Year and scion variety significantly influenced trait variation.
- Rootstock consistently explained 8.99%–9.78% of variation in growth-related traits (yield, pruning weight, berry weight, Ravaz index).
- Optimal rootstock choice led to >50% increases in yield, pruning weight, or Ravaz index, often linked to increased berry weight via enhanced water uptake.
Conclusions:
- Rootstock choice is a critical factor for grape growers aiming to optimize vine performance and yield.
- Specific rootstocks can substantially enhance grape production through improved water uptake and berry development.
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