Suppression of polyphenol oxidases increases stress tolerance in tomato

By P. Thipyapong, J. Melkonian, D. Wolfe, J. Steffens. 2004

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Polyphenol oxidases in plants and fungi: going places? A review. (2006, background): “A very unusual correlation between drought resistance and PPO expression has been reported by Thipayong et al. (2004).”
Comprehending crystalline β-carotene accumulation by comparing engineered cell models and the natural carotenoid-rich system of citrus (2011, unknown): “Moreover, tomato PPO genes B and F are ethylene inducible, and expression of the PPO gene F was found to be absent during water stress (Thipyapong and Steffens, 1997; Thipyapong et al., 2004).”
Defensive Roles of Polyphenol Oxidase in Plants (2008, background): “For example, antisense PPO tomato plants have enhanced pathogen resistance and drought tolerance (Thipyapong et al. 2004b), and PPO-like enzymes can act as hydroxylases in secondary metabolism (Steiner et al. 1999; Nakayama et al. 2000; Cho et al. 2003).”