Which of the following is NOT a key grape variety in Alto Adige?

In the context of Alto Adige, which is a wine region in northern Italy known for its diverse climate and grape varieties, Chardonnay is indeed not considered a key grape variety. The region is primarily recognized for its indigenous varieties and traditional grapes that thrive in its unique microclimates.

Lagrein and Schiava are both native grape varieties that are emblematic of Alto Adige's winemaking tradition. Lagrein is often used to produce robust red wines, while Schiava is known for its lighter, more fruity reds. Riesling, although not indigenous, is successfully cultivated in Alto Adige and is used to produce high-quality white wines that reflect the region's distinct terroir. Thus, while Riesling and even Chardonnay are grown in the area, Chardonnay does not hold the same significance as the indigenous varieties like Lagrein and Schiava.

This distinction underscores the importance of understanding local viticulture in different wine-producing regions, where traditional grape varieties often play a more central role in defining the character and identity of the wines produced.