Intraspecific differences in the photosynthetic responses to chloroplast CO2 and photon flux density at different leaf temperatures of four grapevine cultivars grown in common outdoor conditions

Abstract Comparative measurements of four Vitis vinifera cultivars were undertaken to assess assimilation tolerance to the high growth temperatures currently pervading Australian and other wine growing regions. The cultivars, cvs. Chardonnay, Merlot, Semillon, and Shiraz, were all grown in common gr...

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Main Author: Dennis H. Greer
Format: Article
Language:English
Published: Wiley 2024-06-01
Series:Plant Direct
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Online Access:https://doi.org/10.1002/pld3.595
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author Dennis H. Greer
author_facet Dennis H. Greer
author_sort Dennis H. Greer
collection DOAJ
description Abstract Comparative measurements of four Vitis vinifera cultivars were undertaken to assess assimilation tolerance to the high growth temperatures currently pervading Australian and other wine growing regions. The cultivars, cvs. Chardonnay, Merlot, Semillon, and Shiraz, were all grown in common growth conditions, and an hypothesis promulgated genotypic variation in assimilation and in the leaf temperature dependency. Assimilation responses to varying light intensity and to varying chloroplast CO2 at a range of leaf temperatures (15–45°C) were measured in leaves of each cultivar in mid‐summer. Light response curves revealed marked genotype differences in maximum assimilation, but temperature effects also varied. Semillon leaves were most sensitive to temperature, with marked and steep differences in assimilation at different temperatures while Chardonnay and Merlot were least sensitive, with relatively flat responses. There were also marked cultivar differences in response to CO2 and significant effects of leaf temperature. CO2‐saturated assimilation varied markedly, with Semillon and Merlot leaves most responsive to temperature, although there were differences in optimum temperatures and maximum rates. Chardonnay leaves remained least tolerant, with lowest rates of assimilation across most temperatures. Assimilation at 45°C also separated the cultivars and two cultivars had higher rates than at 15°C while Chardonnay and Merlot leaves had higher rates at 15°C. There were no cultivar differences in the temperature dependency of Ribulose 1,5‐bisphosphate (RuBP) carboxylation, but Semillon had a much steeper temperature dependency on RuBP regeneration than the other cultivars. All these responses confirmed the hypothesis and concluded the high‐temperature tolerance of Semillon and Shiraz and the poor adaptability of Chardonnay and possibly Merlot to perform in the current high‐temperature growth conditions.
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spelling doaj-art-c2886acb0d414dee8ea8b480ffa4fb782025-02-04T08:35:53ZengWileyPlant Direct2475-44552024-06-0186n/an/a10.1002/pld3.595Intraspecific differences in the photosynthetic responses to chloroplast CO2 and photon flux density at different leaf temperatures of four grapevine cultivars grown in common outdoor conditionsDennis H. Greer0National Wine and Grape Industry Centre, School of Agricultural and Wine Science Charles Sturt University Wagga Wagga New South Wales AustraliaAbstract Comparative measurements of four Vitis vinifera cultivars were undertaken to assess assimilation tolerance to the high growth temperatures currently pervading Australian and other wine growing regions. The cultivars, cvs. Chardonnay, Merlot, Semillon, and Shiraz, were all grown in common growth conditions, and an hypothesis promulgated genotypic variation in assimilation and in the leaf temperature dependency. Assimilation responses to varying light intensity and to varying chloroplast CO2 at a range of leaf temperatures (15–45°C) were measured in leaves of each cultivar in mid‐summer. Light response curves revealed marked genotype differences in maximum assimilation, but temperature effects also varied. Semillon leaves were most sensitive to temperature, with marked and steep differences in assimilation at different temperatures while Chardonnay and Merlot were least sensitive, with relatively flat responses. There were also marked cultivar differences in response to CO2 and significant effects of leaf temperature. CO2‐saturated assimilation varied markedly, with Semillon and Merlot leaves most responsive to temperature, although there were differences in optimum temperatures and maximum rates. Chardonnay leaves remained least tolerant, with lowest rates of assimilation across most temperatures. Assimilation at 45°C also separated the cultivars and two cultivars had higher rates than at 15°C while Chardonnay and Merlot leaves had higher rates at 15°C. There were no cultivar differences in the temperature dependency of Ribulose 1,5‐bisphosphate (RuBP) carboxylation, but Semillon had a much steeper temperature dependency on RuBP regeneration than the other cultivars. All these responses confirmed the hypothesis and concluded the high‐temperature tolerance of Semillon and Shiraz and the poor adaptability of Chardonnay and possibly Merlot to perform in the current high‐temperature growth conditions.https://doi.org/10.1002/pld3.595A/ci responsesgrapevinesheat toleranceintraspecific variationleaf temperaturelight responses
spellingShingle Dennis H. Greer
Intraspecific differences in the photosynthetic responses to chloroplast CO2 and photon flux density at different leaf temperatures of four grapevine cultivars grown in common outdoor conditions
Plant Direct
A/ci responses
grapevines
heat tolerance
intraspecific variation
leaf temperature
light responses
title Intraspecific differences in the photosynthetic responses to chloroplast CO2 and photon flux density at different leaf temperatures of four grapevine cultivars grown in common outdoor conditions
title_full Intraspecific differences in the photosynthetic responses to chloroplast CO2 and photon flux density at different leaf temperatures of four grapevine cultivars grown in common outdoor conditions
title_fullStr Intraspecific differences in the photosynthetic responses to chloroplast CO2 and photon flux density at different leaf temperatures of four grapevine cultivars grown in common outdoor conditions
title_full_unstemmed Intraspecific differences in the photosynthetic responses to chloroplast CO2 and photon flux density at different leaf temperatures of four grapevine cultivars grown in common outdoor conditions
title_short Intraspecific differences in the photosynthetic responses to chloroplast CO2 and photon flux density at different leaf temperatures of four grapevine cultivars grown in common outdoor conditions
title_sort intraspecific differences in the photosynthetic responses to chloroplast co2 and photon flux density at different leaf temperatures of four grapevine cultivars grown in common outdoor conditions
topic A/ci responses
grapevines
heat tolerance
intraspecific variation
leaf temperature
light responses
url https://doi.org/10.1002/pld3.595
work_keys_str_mv AT dennishgreer intraspecificdifferencesinthephotosyntheticresponsestochloroplastco2andphotonfluxdensityatdifferentleaftemperaturesoffourgrapevinecultivarsgrownincommonoutdoorconditions