GrapeFACE Q1. Most important climate question

1) What do you think is the more important broad question with respect to climate change and wine grapevine responses?

a) What will be the impact of temperature (average, yearly patterns and extremes)?

b) What will be the impact of water shortage and water quality decline?

c) What will be the impact of increased carbon dioxide?

d) What will be the interactions of a,b,c?

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6 Comments

  1. Brian Loveys said

    Discussions at the GrapeFACE workshop highlighted the importance of being able to study more than one variable, and temperature (and consequent changes in VPD) are probably as important as CO2. As I said in that occasion industry would probably see projected temperature increases as more threatening than changes in CO2 and would be more likely to support any proposal with a temperature component than one without.

  2. Brian Loveys said

    Another very important aspect that can be addressed is to look at CO2/temperature effects of secondary metabolism. We now have a great deal of expertise in this area and we need to think about how we could fund some relevant studies or indeed whether some pilot study could be worked in under our existing framework

  3. Steve Tyerman said

    Agree, but I keep wondering that if we could “smell or feel” carbon dioxide there would be a greater inclination from “industry” for us to study it. Temperature is obvious and sometimes rather misleading, since we have already experienced average temperatures that corresponds to 2050. CO2 is changing at a far greater rate than temperature is, though clearly vines are very sensisitve to temperature.

  4. Steve Tyerman said

    Yes, this came out of Bindi’s work and there was an indication in one year at least that anthocyanins were affected. In the seminar he gave the impression that this was observed generally, but the paper shows that the effect was only in one year I think.

  5. Everard Edwards said

    Leaf warming due to stomatal closure may also have effects not
    mentioned at the meeting. For instance, Marilyn Balls group at RSBS
    and others have shown a big increase in frost sensitivity due to loss
    of cold hardening. Consequently, this possibility would need to be
    considered and
    CO2 would need to be on prior to budburst – increasing cost.

  6. Everard Edwards said

    As with many others, I think for grapevines in particular the
    interaction with temperature must be considered. The ‘double whammy’
    on the leaf/fruit of elevated air temp/VPD and reduced transpiration
    due to eCO2 could have effects on an unforeseen scale.

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