Genetic variability of photosynthesis and water use in Balearic grapevine cultivars
Identifieur interne : 000879 ( Main/Exploration ); précédent : 000878; suivant : 000880Genetic variability of photosynthesis and water use in Balearic grapevine cultivars
Auteurs : By J. Bota [Espagne] ; J. Flexas [Espagne] ; H. Medrano [Espagne]Source :
- Annals of Applied Biology [ 0003-4746 ] ; 2001-06.
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Abstract
A comparison of photosynthetic characteristics of 20 cultivars of grapevine (Vitis vinifera L.) from Mallorca (Balearic Islands, Spain) and two widespread cultivars, Cabernet Sauvignon and Chardonnay, was made under irrigation as well as in response to drought. Although these cultivars share a common origin, a high variability was found for several photosynthetic characters under irrigation. Interestingly, these variations were significant for gas‐exchange parameters (net CO2 assimilation, stomatal conductance and intrinsic water use efficiency) but not for chlorophyll fluorescence parameters (maximum photochemical efficiency, electron transport rate and non‐photochemical quenching). Since water stress is the most limiting factor for plant production under the Mediterranean climate, it is presumable that these findings reflect specific selection pressures over physiological characteristics related to a balance between net carbon gain and water use. Some cultivars presented high carbon assimilation at the expense of a high water loss, whereas others were water savers, accompanied by low CO2 assimilation even under irrigation. Escursach was found to be an interesting cultivar, presenting low water consumption at the same time as reasonably high carbon assimilation. These cultivars also showed different responses to drought, which allowed their classification in two main groups: alarmist cultivars, which showed strong reductions of stomatal conductance in response to relatively low decreases of leaf water potential, and luxurious cultivars, showing low reductions of stomatal conductance under water stress.
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DOI: 10.1111/j.1744-7348.2001.tb00120.x
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Although these cultivars share a common origin, a high variability was found for several photosynthetic characters under irrigation. Interestingly, these variations were significant for gas‐exchange parameters (net CO2 assimilation, stomatal conductance and intrinsic water use efficiency) but not for chlorophyll fluorescence parameters (maximum photochemical efficiency, electron transport rate and non‐photochemical quenching). Since water stress is the most limiting factor for plant production under the Mediterranean climate, it is presumable that these findings reflect specific selection pressures over physiological characteristics related to a balance between net carbon gain and water use. Some cultivars presented high carbon assimilation at the expense of a high water loss, whereas others were water savers, accompanied by low CO2 assimilation even under irrigation. Escursach was found to be an interesting cultivar, presenting low water consumption at the same time as reasonably high carbon assimilation. These cultivars also showed different responses to drought, which allowed their classification in two main groups: alarmist cultivars, which showed strong reductions of stomatal conductance in response to relatively low decreases of leaf water potential, and luxurious cultivars, showing low reductions of stomatal conductance under water stress.</div></front></TEI><affiliations><list><country><li>Espagne</li></country><region><li>Îles Baléares</li></region></list><tree><country name="Espagne"><region name="Îles Baléares"><name sortKey="Bota, By J" sort="Bota, By J" uniqKey="Bota B" first="By J" last="Bota">By J. Bota</name></region><name sortKey="Flexas, J" sort="Flexas, J" uniqKey="Flexas J" first="J" last="Flexas">J. Flexas</name><name sortKey="Medrano, H" sort="Medrano, H" uniqKey="Medrano H" first="H" last="Medrano">H. 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