FOOD SCIENCE ›› 2013, Vol. 34 ›› Issue (8): 294-298.doi: 10.7506/spkx1002-6630-201308063

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Involvement of Nitric Oxide in Defense Response of Salicylic Acid-Induced Disease in Postharvest Tomato Fruits

LI Cui-dan,SHEN Lin,SHENG Ji-ping   

  1. 1. College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China;2. School of Agricultural Economics and Rural Development, Renmin University of China, Beijing 100872, China
  • Received:2012-03-12 Revised:2013-03-17 Online:2013-04-25 Published:2013-05-07

Abstract: Salicylic acid (SA) and nitric oxide (NO) are important signaling molecules in disease resistance of plants. Previous studies have demonstrated the NO involvement in SA pathway. In order to explore whether NO involvement in defense response of SA-induced disease in postharvest tomato fruits and corresponding mechanisms, tomato fruits (Lycopersicon esculentum cv. Lichun) were treated with methyl salicylate (MeSA) and nitric oxide synthase (NOS) inhibitor (L-NNA). The effect of L-NNA on the resistance to Botrytis cinerea, NOS activity, NO level and defensive enzyme activity was explored. Our results showed that MeSA treatment improved disease resistance and L-NNA treatment inhibited the activities of defensive enzymes including phenylalanine ammonialyase (PAL), chitinase (CHI), β-1,3-glucanase (GLU) and polyohenoloxidase (PPO). Therefore, NO was involved in defense response of SA-induced disease in postharvest tomato fruits.

Key words: nitric oxide, salicylic acid, disease resistance, tomato fruit