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Martin Luther Univesitat Halle Wittenberg (2014)

Role of the potassium nutritional status on drought stress-induced leaf senescence in barley

Seyed Abdollah Hosseini

Titre : Role of the potassium nutritional status on drought stress-induced leaf senescence in barley

Auteur : Seyed Abdollah Hosseini

Université de soutenance : Martin Luther Univesitat Halle Wittenberg

Grade : Doctor Rerum Naturalium 2014

Résumé
Terminal drought stress may induce premature leaf senescence that affects nutrient uptake and translocation to shoots and leads to a decline in grain yield. Potassium (K) plays a protective role in alleviating drought stress. To unravel the role of K nutrition in carbohydrate metabolism and hormonal regulation during drought, 3 near-isogenic barley lines, were subjected to drought stress under low, medium or high K supplies. The results showed higher chlorophyll and lower expression levels of the senescence marker HvS40 in the line LP104 which was coincided with elevated leaf K levels in this line. Moreover, the depletion of starch in flag leaves of this line was significantly lower. Also, ABA accumulated in lower lever in drought-stressed LP104 flag leaves under K-deficiency which was associated with higher turnover of ABA. This study indicates that the beneficial effect of K on drought-induced ABA signaling, which has been mainly described at the molecular level, is also of physiological relevance in drought-stressed crop plants.

Mots Clés : terminaler Trockenstress ; Gerste ; Kaliumernährung ; Primärmetabolismus ; Abszissinsäure ; Nährstoffeffizienz ; terminal drought stress ; barley ; potassium nutrition ; primary metabolites ; abscisic acid ; nutrient efficiency

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Page publiée le 8 novembre 2015, mise à jour le 7 janvier 2019