Stomatal and non-stomatal limitations at different leaf temperatures to the photosynthetic process during the post-harvest period for Vitis vinifera cv. Chardonnay vines.

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Abstract

Photosynthesis in Vitis vinifera cv. Chardonnay leaves was measured during the post-harvest period in relation to leaf temperatures and chloroplast CO2 concentrations to evaluate the limitations to photosynthesis once the fruit sink was removed. Photosynthesis was optimal at 30°C and rates were higher at high compared to low temperatures, consistent with the current climate. Stomatal limitation of photosynthesis ranged from 20% at low temperatures to 45% at high temperatures. RuBP carboxylation (Vcmax) and regeneration (Jmax) were optimal at 39 and 36°C, but their capacities were low below 25°C accounting for low assimilation rates. Chloroplast CO2 concentration transitioning between RuBP regeneration and RuBP carboxylation-limited assimilation, increased steeply with increasing temperature. Assimilation of Chardonnay leaves was limited by RuBP regeneration below 35°C and by RuBP carboxylation above 35°C, consistent with increased photorespiration at high temperatures. Results provide a quantitative explanation for the photosynthetic performance of Chardonnay vines in the post-harvest period.

Original languageEnglish
Pages (from-to)1-21
Number of pages21
JournalNew Zealand Journal of Crop and Horticultural Science
Volume48
Issue number1
Early online date19 Jun 2019
DOIs
Publication statusPublished - 2020

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