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Plants after 90 days of exposure to different watering and dopamine treatments: WW, irrigated daily to maintain 75–85% field capacity; DS, irrigated daily to maintain 45–55% field capacity; WW + DA, irrigated daily to maintain 75–85% field capacity plus 100 μM dopamine; and DS + DA, irrigated daily to maintain 45–55% field capacity plus 100 μM dopamine.
