Open Access Open Access  Restricted Access Subscription Access

Morphological and Physiological Plant Responses to Drought Stress in Thymus citriodorus


Affiliations
1 Monsanto Hungaria Kft, Turi Istvan Ut 1, Budapest 1238, Hungary
2 Department of Agricultural Sciences (DIPSA), University of Bologna, Viale Fanin 44, 40127 Bologna, Italy
3 Department of Medicinal and Aromatic Plants, Corvinus University of Budapest, Fovam Ter 8, Budapest 1093, Hungary
 

Water availability is considered as a determinant factor that affects plant growth. The commercial medicinal values of an aromatic plant rely on the presence of secondary metabolites that are affected under water shortage. Two-year-old Thymus citriodorus plants were subjected to different polyethylene glycol (PEG-6000) levels (0, 2%, and 4%) under green house condition. PEG treatment lasted for 15 days. Thyme plant showed amorphological drought avoidance mechanism by maintaining the root system development through shoot fresh weight reduction resulting in promoted root absorption capacity and sustained plant growth. Moreover, stressed plants were able to maintain water use efficiency and root : shoot ratio suggesting a strong relation between root water uptake and water use saving strategies. Furthermore, thyme plants reduced tissue dehydration through stomatal closure and improved root water uptake. Content of volatile oil constituents of geraniol and diisobutyl phthalate increased upon drought stress while pseudophytol was reduced. Unexpectedly, thymol was not reported as a main oil element under either control or mild stress condition, while it was increased upon high drought stress in measure of 4.4%. Finally, carvacrol significantly accumulated under high drought stress (+31.7%) as compared to control plants.
User
Notifications
Font Size

Abstract Views: 136

PDF Views: 0




  • Morphological and Physiological Plant Responses to Drought Stress in Thymus citriodorus

Abstract Views: 136  |  PDF Views: 0

Authors

Zdzislaw Attila Tatrai
Monsanto Hungaria Kft, Turi Istvan Ut 1, Budapest 1238, Hungary
Rabab Sanoubar
Department of Agricultural Sciences (DIPSA), University of Bologna, Viale Fanin 44, 40127 Bologna, Italy
Zsuzsanna Pluhar
Department of Medicinal and Aromatic Plants, Corvinus University of Budapest, Fovam Ter 8, Budapest 1093, Hungary
Silvia Mancarella
Department of Agricultural Sciences (DIPSA), University of Bologna, Viale Fanin 44, 40127 Bologna, Italy
Francesco Orsini
Department of Agricultural Sciences (DIPSA), University of Bologna, Viale Fanin 44, 40127 Bologna, Italy
Giorgio Gianquinto
Department of Agricultural Sciences (DIPSA), University of Bologna, Viale Fanin 44, 40127 Bologna, Italy

Abstract


Water availability is considered as a determinant factor that affects plant growth. The commercial medicinal values of an aromatic plant rely on the presence of secondary metabolites that are affected under water shortage. Two-year-old Thymus citriodorus plants were subjected to different polyethylene glycol (PEG-6000) levels (0, 2%, and 4%) under green house condition. PEG treatment lasted for 15 days. Thyme plant showed amorphological drought avoidance mechanism by maintaining the root system development through shoot fresh weight reduction resulting in promoted root absorption capacity and sustained plant growth. Moreover, stressed plants were able to maintain water use efficiency and root : shoot ratio suggesting a strong relation between root water uptake and water use saving strategies. Furthermore, thyme plants reduced tissue dehydration through stomatal closure and improved root water uptake. Content of volatile oil constituents of geraniol and diisobutyl phthalate increased upon drought stress while pseudophytol was reduced. Unexpectedly, thymol was not reported as a main oil element under either control or mild stress condition, while it was increased upon high drought stress in measure of 4.4%. Finally, carvacrol significantly accumulated under high drought stress (+31.7%) as compared to control plants.