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Nighttime transpiration represents a negligible part of water loss and does not increase the risk of water stress in grapevine
Author(s) -
Dayer Silvina,
Herrera José Carlos,
Dai Zhanwu,
Burlett Régis,
Lamarque Laurent J.,
Delzon Sylvain,
Bortolami Giovanni,
Cochard Hervé,
Gambetta Gregory A.
Publication year - 2021
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/pce.13923
Subject(s) - transpiration , daytime , environmental science , stomatal conductance , soil water , horticulture , water stress , agronomy , photosynthesis , atmospheric sciences , botany , biology , soil science , geology
Nighttime transpiration has been previously reported as a significant source of water loss in many species; however, there is a need to determine if this trait plays a key role in the response to drought. This study aimed to determine the magnitude, regulation and relative contribution to whole plant water‐use, of nighttime stomatal conductance ( g night ) and transpiration ( E night ) in grapevine ( Vitis vinifera L.). Our results showed that nighttime water loss was relatively low compared to daytime transpiration, and that decreases in soil and plant water potentials were mainly explained by daytime stomatal conductance ( g day ) and transpiration ( E day ). Contrary to E day , E night did not respond to VPD and possible effects of an innate circadian regulation were observed. Plants with higher g night also exhibited higher daytime transpiration and carbon assimilation at midday, and total leaf area, suggesting that increased g night may be linked with daytime behaviors that promote productivity. Modeling simulations indicated that g night was not a significant factor in reaching critical hydraulic thresholds under scenarios of either extreme drought, or time to 20% of soil relative water content. Overall, this study suggests that g night is not significant in exacerbating the risk of water stress and hydraulic failure in grapevine.