【摘要】 L-精氨酸在植物中除作为一种重要的氮素贮藏营养物供再利用外,还是生成多胺(PA)和一氧化氮(NO)等的前体物质,而PA和NO都是植物中重要的信使分子,参与包括生长发育、抗逆性等在内的几乎所有的生理生化过程。精氨酸脱羧酶(ADC)、精氨酸酶和一氧化氮合酶(NOS)是L-精氨酸分解代谢的关键酶,精氨酸可经ADC或精氨酸酶-鸟氨酸脱羧酶(ODC)途径形成PA,也可经NOS途径形成NO,3个酶活性的相对强弱,决定了精氨酸的代谢方向。根系在越冬期间会积累丰富的精氨酸;精氨酸代谢对于植物感知和适应环境变化有重要意义。更多还原

【Abstract】 L-Arginine is an important and unique amino acid in plants. It serves not only as an im-portant nitrogen reserve and recycling,but also as a precursor of the biosynthesis of polyamines,ni-tric oxide and so on. Polyamines and nitric oxide are important messengers involved in almost all physiological and biochemical processes,growth & development,and adaptation of plants to stress. Arginine decarboxylase,arginase and nitric oxide synthase are the key enzymes in L-arginine catabolism,in which polyamines are formed through ADC or arginase-ODC pathway while ni-tric oxide is formed through the NOS pathway. The relative activity of these three enzymes can con-trol the direction of arginine metabolism. Argin-ine content keeps higher level in roots during over-winter period. The arginine metabolism plays im-portant role in perception and adaptation of plant to environmental disturbances.更多还原