TY - JOUR
T1 - Drought tolerance in four-day-old seedlings of a drought-sensitive cultivar of wheat
AU - Koobaz, Parisa
AU - Ghanati, Faezeh
AU - Hosseini Salekdeh, Ghasem
AU - Moradi, Foad
AU - Hadavand, Hossein
PY - 2017
Y1 - 2017
N2 - Four-day-old seedlings of spring wheat (Triticum aestivum L. cv. Marvdasht) can tolerate severe dehydration and recover after re-watering. In order to clarify tolerance mechanism, in a completely randomized design, the seedlings were exposed to drought by complete water cessation for 10 and 20 days, followed by re-watering for 3 and 7 days. Upon dehydration, the activity of α-amylase increased whereas growth parameters; photosynthetic pigments; and the activities of lipoxygenase, indole acetic acid (IAA) oxidase, and ascorbate peroxidase (APX) decreased. The activity of APX and the expression of its gene, however, increased after re-watering. Prolonged dehydration was also accompanied by increase in sucrose, soluble proteins, fructans, and certain amino acids, e.g. proline, glutamine, and valine. The results indicated that during dehydration, 4-day-old wheat seedlings shifted their energy expenditure from basal metabolism to withstand water deficiency via lowering the activity of membrane-damaging enzymes and enhancing the production of osmoprotectants.
AB - Four-day-old seedlings of spring wheat (Triticum aestivum L. cv. Marvdasht) can tolerate severe dehydration and recover after re-watering. In order to clarify tolerance mechanism, in a completely randomized design, the seedlings were exposed to drought by complete water cessation for 10 and 20 days, followed by re-watering for 3 and 7 days. Upon dehydration, the activity of α-amylase increased whereas growth parameters; photosynthetic pigments; and the activities of lipoxygenase, indole acetic acid (IAA) oxidase, and ascorbate peroxidase (APX) decreased. The activity of APX and the expression of its gene, however, increased after re-watering. Prolonged dehydration was also accompanied by increase in sucrose, soluble proteins, fructans, and certain amino acids, e.g. proline, glutamine, and valine. The results indicated that during dehydration, 4-day-old wheat seedlings shifted their energy expenditure from basal metabolism to withstand water deficiency via lowering the activity of membrane-damaging enzymes and enhancing the production of osmoprotectants.
KW - drought stress
KW - fructan
KW - proline
KW - re-watering
KW - wheat
UR - http://www.scopus.com/inward/record.url?scp=85012170744&partnerID=8YFLogxK
U2 - 10.1080/01904167.2016.1262417
DO - 10.1080/01904167.2016.1262417
M3 - Article
AN - SCOPUS:85012170744
SN - 0190-4167
VL - 40
SP - 574
EP - 583
JO - Journal of Plant Nutrition
JF - Journal of Plant Nutrition
IS - 4
ER -