Differential Regulation of Amino Acids and Nitrogen for Drought Tolerance and Poststress Recovery in Creeping Bentgrass

Effects of amino acids and nitrogen on plant regrowth or recovery from drought stress remain largely unknown. The objectives this study were to examine how gamma-aminobutyric acid (GABA) proline, alone in combination, inorganic [ammonium nitrate (NN)] may differentially affect turf performance during rewatering, determine which specific endogenous regulated by GABA, NN priming associated with tolerance postdrought recuperation cool-season grass species. Creeping bentgrass ( Agrostis stolonifera cv. Penncross) planted porous ceramic fritted clay medium exposed well-watered conditions withholding irrigation for 21 days growth chambers. Plants treated water (untreated control), proline through foliar spray before every 7 the 21-day period. For recovery, at treatment, plants rewatered 14 return soil content prestress levels. GABA combination maintained higher quality (TQ), dark green color index (DGCI), stolon length stress, whereas proline-treated also leaf relative (RWC) as well longer rewatering. TQ RWC had improved percent canopy cover, DGCI, Accumulation under including alanine, creeping have contributed enhancement regrowth. Nitrogen-enhanced accumulation glutamic played a role active assimilation subsequent Results indicate that mainly effective promoting while was rapid potential activation metabolism. Endogenous acids, acid, be used biomarkers select drought-tolerant biostimulant components improvement poststress turfgrass