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Maintenance of integrity of adaxial leaf epicuticular wax layer under drought by foliar spray of nanoceria. (a) Irrigated and water-sprayed, (b) irrigated and nanoceria-sprayed, (c) drought and water-sprayed, and (d) drought and nanoceria-sprayed. ⊕ represents intact epicuticular wax, and ⌀ shows disintegrated epicuticular wax.
