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EcoClimLab / vertical-thermal-review

Manuscript and new analysis files for Vinod et al., 2022, New Phytologist
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Questions for respiration section of the paper #44

Closed NidhiVinod closed 3 years ago

NidhiVinod commented 3 years ago

Hi @SlotMartijn and @teixeirak, did we decide to pursue this or save it for future paper(s)? Martijn has some unpublished data on this that we might include. unpublished data showing higher Q10 in shade than in sun leaves for 10 species or so. May make sense to include here: https://github.com/EcoClimLab/vertical-thermal-review/issues/8.

This seems to be in line with this part of my understanding (if my understanding is right) and related references:

Leaf respiration is lower during the day than the night, due to light-induced inhibition that is highest in high-irradiance and moderate-to-high-temperature and lowest at high-irradiance and low-temperature [@atkinLeafRespirationSnow2000; @atkinLeafRespirationSnow2000; @keenanWidespreadInhibitionDaytime2019; @zaragoza-castellsDoesGrowthIrradiance2007]. Light-induced inhibition of leaf respiration influences $Q{10}$ where $Q{10}$ is greatest in the dark, and decreases with increase in irradiance [@atkinLeafRespirationSnow2000].

Would $Q_{10}$ being greater during the night, especially with increase in temperature, have something to do with observed understory temperature related reduced growth rates in Rollinson et al.'s paper?

SlotMartijn commented 3 years ago

In our dataset we measured respiration in the dark for both sun and shade leaves, so I don't think that light inhibition of respiration can be an explanatory factor. Light appears to inhibit respiration rates in the light, when photosynthesis produces some ATP and NADPH, which may reduce demands for mitochondrial production of these intermediates. So it really has to do with light during measurement. It is possible that Q10 of dark respiration is greater than Q10 of respiration in the light (I don't know/remember whether this has been convincingly shown), but again, for understory-canopy comparison this should not be a big factor.

NidhiVinod commented 3 years ago

I think this can be closed too :) Thanks Martijn!!!!