Do Phytohormones Influence the Grain Quality and Yield of Winter Wheat under Drought Conditions?

Abstract

Two winter wheat (Triticum aestivum L.) cultivars (Sirvan & Pishtaz) were grown in greenhouse in College of Agriculture, Shiraz, Iran, under two water regimes (80%FC & 40% FC) after anthesis to evaluate the influence of two phytohormones (Salycilic acid and Strigolactone) on grain yield and quality. On grain samples, the following quality analyses were performed: grain hardness, protein and gluten content, gluten index and SDS test. Furthermore, Grain yield and thousand grain weight were measured as well. Results showed that protein content, grain hardness, wet gluten, gluten index and SDS were enhanced in drought condition. However, this rate dampened when pots sprayed with salycilic acid or strigolactone. A significant reduction in thousand grain weight and yield were observed in drought of both cultivars. This reduction was lower in cv. Sirvan. Exogenous application of salycilic acid and strigolactone diminish diverse effects of drought in plants. Restricted water during grain filling stage leads to lower yield but higher grain quality. Application of strigolactone and salycilic acid changed these results next to well watered situation. 

Strigolactones Affect Growth Parameters and Some Antioxidant Enzyme Activities in Wheat (Triticum aestivum L.) under Salt Stress

“…These results are consistent with a study byLing et al (2020) determined that GR24 treatment has increased SOD activity in rice seedlings under salt stress Ma et al (2017). also showed a significant effect of strigolactone on SOD activity in rapeseed Sedaghat et al (2017). determined that GR24 alone and together with SA applications induced morphological (membrane stability, electrolyte leakage, stoma limitation, relative water content) and biochemical (SOD, APX, POX, CAT, MDA) performance in wheat under drought stress.…”

Salinity Stress in Wheat (Triticum aestivum L.) in the Changing Climate: Adaptation and Management Strategies

“…The manipulation with strigolactone, which is engaged in symbiotic relations in the rhizosphere, provides new ways for generating stress tolerant wheat germplasm (Abhinandan et al, 2018). Plants treated with synthetic SL analog GR24 exogenously under drought stress conditions significantly increased the thousandgrain weight as compare to non-treated drought-stressed two winter wheat cultivars (Sedaghat et al, 2017). Future research need to focus the vital role of synthetic and natural hormones for alleviating salinity stress as various hormones hold potential to modulate and regulate vital metabolic processes under stressful environment.…”

Abiotic Stress Signaling in Wheat – An Inclusive Overview of Hormonal Interactions During Abiotic Stress Responses in Wheat

“…Based on this observation, it can be concluded that SL plays a crucial role in abiotic stress responses in close association with ABA. Drought stress was shown to reduce thousand grain weight as well as yield in two winter wheat cultivars (Triticum aestivum L.) , this being significantly alleviated when plants were exogenously treated with synthetic SL analog GR24 ( Sedaghat et al, 2017 ). This hormone may hold the key to biotechnological advancements in the agricultural protection of adverse climatic conditions, specifically salt and drought, simply through its ability to enhance drought tolerance via exogenous application ( Ha et al, 2014 ).…”