Heat stress has detrimental impacts on wheat growth and yield formation. Conferring heat tolerance through applying plant growth regulators is a feasible strategy to reduce loss. Gamma aminobutyric acid (GABA) is a four-carbon non-proteinogenic amino acid existing in organisms and accumulates in response to stress. In this study, spring wheat Liaochun17 and winter wheat Jingdu 40 were used to investigate the function of exogenous GABA on the heat tolerance of wheat seedlings. Data displayed that GABA treatment not only reduced the production of reactive active oxygen (ROS), but also improved the scavenging capacity of diphenyl picryl phenyl hydrazine active oxygen under heat stress, thus alleviating the accumulation of malondialdehyde and the damage of cell membrane. In addition, analysis of protein and amino acids revealed that GABA effectively promoted the accumulation of soluble protein and coordinated amino acid homeostasis. Summarily, our current findings revealed that GABA strengthened the resistance of wheat seedling to heat stress by maintaining the metabolism balance of ROS and amino acids.

热应激对小麦生长和产量形成产生不利影响。通过应用植物生长调节剂赋予耐热性是减少损失的可行策略。伽马氨基丁酸 (GABA) 是一种存在于生物体中的四碳非蛋白氨基酸，并在应对压力时积累。本研究以春小麦辽春17号和冬小麦京都40号为研究对象，研究外源GABA对小麦幼苗耐热性的影响。数据显示，GABA处理不仅减少了活性活性氧(ROS)的产生，而且提高了热应激下二苯基苦基苯肼活性氧的清除能力，从而减轻了丙二醛的积累和细胞膜的损伤。此外，蛋白质和氨基酸分析表明，GABA有效促进可溶性蛋白质的积累和协调氨基酸稳态。总之，我们目前的研究结果表明，GABA 通过维持 ROS 和氨基酸的代谢平衡来增强小麦幼苗对热胁迫的抵抗力。