Differences in stomatal responses and root to shoot signalling between two grapevine varieties subjected to drought
Alexandros Beis A and Angelos Patakas A BA Laboratory of Plant Production, School of Natural Resources and Enterprises Management, University of Ioannina, G. Seferi 2, 30 100 Agrinio, Greece.
B Corresponding author. Email: apatakas@cc.uoi.gr
Functional Plant Biology 37(2) 139-146 https://doi.org/10.1071/FP09034
Submitted: 11 February 2009 Accepted: 17 September 2009 Published: 3 February 2010
Abstract
A comparative study on stomatal control between two grapevine varieties (Vitis vinifera L. cvs Sabatiano and Mavrodafni) differing in their ability for drought adaptation was conducted using 3-year-old own-rooted plants. The plants were subjected to prolonged drought stress by withholding irrigation water. The relationship between predawn water potential and maximum stomatal conductance indicated significant differences in stomatal sensitivity to drought between the two varieties. Stomatal closure occurred at higher values of predawn water potential in Sabatiano compared with Mavrodafni. No significant differences were found in plant hydraulic conductance and osmotic potential at full turgor (π100) between the two varieties. Leaf and root ABA concentrations increased more rapidly in Mavrodafni compared with Sabatiano at the beginning of the drought period. Furthermore, Mavrodafni also exhibited significantly higher xylem pH values as well as higher stomatal sensitivity to ABA and pH increase compared with Sabatiano. Results suggest that these two grapevine varieties might have evolved different strategies in order to adapt under drought conditions. In particular, the greater ability for drought adaptation in Sabatiano might be attributed to the more efficient regulation of stomatal closure. In contrast, chemical signalling in Mavrodafni seems to be the main mechanism for drought adaptation.
Additional keywords: abscisic acid, hydraulic conductance, isohydricity, stomatal conductance.
Acknowledgements
This research project (PENED) is co-financed by an E.U.-European Social Fund (80%) and the Greek Ministry of Development-GSRT (20%).
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