Effect of Plant Growth Regulators on Creeping Bentgrass during Heat, Salt, and Combined Stress

Creeping bentgrass ( Agrostis stolonifera L.) is a turfgrass species that widely used on golf courses throughout the United States. In field settings, plants are often subjected to more than one stress at time, and studying stresses independently likely insufficient. Stresses, such as heat salt stress, can affect plant hormone levels and, in turn, how well tolerates stress. The objectives of experiments were determine if would be detrimental creeping health, applying growth regulators could improve health during During first experiment, was transplanted hydroponics systems two different chambers. One chamber set have day night temperatures 35 °C 30 (heat stress), respectively, other had 25 20 °C, respectively. Within each chamber, block received 50 mM NaCl treatment (salt stress) did not (control). treatments applied for 14 days. Results experiment indicated sufficient negatively by fresh shoot root weights, tillering, electrolyte leakage, total chlorophyll content (TCC). There significant interactions temperature × level detected weights leakage. Plants exposed both affected either or alone all metrics except tillering. presence reduced tillering regardless regimen. second treated same, but regulator (PGR) also applied. PGR consisted gibberellic acid (GA) synthesis inhibitor products, 2,4-dichlorophenoxyacetic acid, rates aminoethoxyvinylglycine (AVG), an ethylene suppressor, with PGR. addition measurements growth, dry measured. For TCC, there two-way interaction between treatment. three-way Combined treatment, differences treatments. AVG exhibited improved compared These highest masses. GA inhibitors lowest masses TCC when