N. Abdiazar, H. Zahedi, Y. Sharghi, S. A. M. Modarres-Sanavy, A. Alipour
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引用次数: 0
Abstract
While the potential for biostimulants to mitigate water stress holds promise, the underlying physiological mechanisms in safflower (Carthamus tinctorius L.) regarding this matterremain unclear. Elucidating how biostimulants treatments may induce adaptive changes in ROS scavenging, osmoregulation, carbon fixation, gas exchange, and provides insight into optimizing plant water stress tolerance at the cellular level. This split-plot study included biostimulant foliar treatments (folic acid, epibrassinolide, chitosan, glutathione) as subplots, and irrigation regimes (optimal, mild, severe water deficit) as main plots. Under mild water stress, folic acid and epibrassinolide sprays exhibited the highest increase in chlorophyll a (55.3%) and chlorophyll b (51.0%). These treatments also showed the most substantial increases in carotenoids (36.1%), relative water content (18.5%), and soluble proteins (20%). Proline levels were highest with glutathione and chitosan treatments, which increased levels by 81% compared to the control. Transpiration rates were 30% higher on average with folic acid, epibrassinolide, chitosan, and glutathione treatments. Folic acid led to the highest grain yield increase (26%) and GPX levels (22.9%). Severe water stress saw epibrassinolide and glutathione treatments increase relative water content the most (20%). Chitosan led to the highest increases in soluble proteins (23.2%) and transpiration (97%). Proline levels were 59.7% higher on average with folic acid, epibrassinolide, and chitosan treatments. GPX levels increased the most with epibrassinolide, chitosan, and glutathione (62%). Fv/Fm ratios were 170 and 50% higher with folic acid and chitosan or epibrassinolide and glutathione, respectively. Overall, folic acid and epibrassinolide performed best under mild stress, maintaining photosynthesis and yields through increasing chlorophyll, proteins, and water retention. Epibrassinolide, chitosan, and glutathione were most effective under severe stress, conferring drought tolerance by improving antioxidant defenses, protein levels, and water retention.
期刊介绍：
Russian Journal of Plant Physiology is a leading journal in phytophysiology. It embraces the full spectrum of plant physiology and brings together the related aspects of biophysics, biochemistry, cytology, anatomy, genetics, etc. The journal publishes experimental and theoretical articles, reviews, short communications, and descriptions of new methods. Some issues cover special problems of plant physiology, thus presenting collections of articles and providing information in rapidly growing fields. The editorial board is highly interested in publishing research from all countries and accepts manuscripts in English.
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