Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 59, Issue 12, Pages 6543-6549Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf2000053
Keywords
Preharvest treatment; L-arginine; nitric oxide; disease resistance; tomato fruit
Funding
- National Basic Research Program of China [2011CB100604]
- National Natural Science Foundation of China [31071623, 30671471]
- Ministry of Agriculture [200803033]
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L-Arginine is the precursor of nitric oxide (NO). In order to examine the influence of L-arginine on tomato fruit resistance, preharvest green mature tomato fruits (Solanum lycopersicum cv. No. 4 Zhongshu) were treated with 0.5, 1, and 5 mM L-arginine. The reduced lesion size (in diameter) on fruit caused by Botrytis cinerea, as well as activities of phenylalanine ammoni-alyase (PAL), Chitinase (CHI), beta-1,3-glucanase (GLU), and polyphenoloxidase (PPO), was compared between L-arginine treated fruits and untreated fruits. We found that induced resistance increased and reached the highest level at 3-6 days after treatment. Endogenous NO concentrations were positively correlated with PAL, PPO, CHI, and GLU activities after treatment with Pearson coefficients of 0.71, 0.94, 0.97, and 0.87, respectively. These results indicate that arginine induces disease resistance via its effects on NO biosynthesis and defensive enzyme activity.
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