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Josip Juraj Strossmayer University of Osijek (2015)

RECOVERY OF DROUGHT STRESSED BARLEY SEEDLINGS BY RE-WATERING

Mihaljević Ljuba

Titre : RECOVERY OF DROUGHT STRESSED BARLEY SEEDLINGS BY RE-WATERING

Auteur : Mihaljević Ljuba

Université de soutenance : Josip Juraj Strossmayer University of Osijek

Grade : Master’s Thesis (magistar/magistra biologije) 2015

Résumé
Drought tolerance is one of the most studied features considering the global problem of water deficit. The main goal of this study was to deter mine the lowest value of relative water content in leaf (RWC) in which re-watering might recover physiological and biochemical processes, with particular emphasis on the photosynthetic apparatus. Barley seedlings (Hordeumvulgare L.) were cultivated in the growth chamber for ten days and then subjected to drought. The drought lasted from 7 to 10 days, depending on the experiment, after which the plants were re-watered daily for four days. The results of chlorophyll a fluorescence measurements showed that the critical point for photosynthesis recovery is the eighth day of drought or RWC of 21%,respectively. At the end of the rehydration, increased performance index (PIABS) reached the valueas in control and thus pointed to a full recovery of the photosynthetic apparatus. Despite the fact that the other measured parameters (RWC, the level of lipid peroxidation and free proline content)were not fully equalized with the controls, observed results indicated a high tendency for the re-establishment of homeostasis, previously disrupted by severe drought

Présentation : Croatian Digital Theses Repository (CDRT)

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Page publiée le 15 mai 2022