Improving Drought Tolerance by Exogenous Application of Glycinebetaine and Salicylic Acid in Sunflower

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Plant drought stress: effects, mechanisms and management (2011, positive): “Impaired mitosis, cell elongation and expansion result in reduced plant height, leaf area and crop growth under drought (Nonami, 1998; Kaya et al., 2006; Hussain et al., 2008).”
Recent methods of drought stress tolerance in plants (2017, background): “Along with many physiological processes, SA also confer various environmental stress tolerance such as drought, chilling and heat stress (Hussain et al.”
Response Mechanism of Plants to Drought Stress (2021, background): “Drought stress can cause the accumulation of glycine betaine and it can improve the drought-resistant ability of plants [61], which have been proven in sunflower [62], wheat [63], barley [64], pepper [65], Axonopus compressus [66], etc.”
Exogenously applied polyamines increase drought tolerance of rice by improving leaf water status, photosynthesis and membrane properties (2009, background): “These effects lead to reduced growth and yield in a number of plant species (Abdul Jaleel et al. 2009; Farooq et al. 2008, 2009a; Hussain et al. 2008a, b; Razmjoo et al. 2008).”
Crop Production under Drought and Heat Stress: Plant Responses and Management Options (2017, background): “Drought impairs mitosis and cell elongation which results in poor growth (Hussain et al., 2008).”