noun
negative heliotropism; apheliotropism
Scientific term in botany: growth or movement away from sunlight. Often contrasted with 向日性 (positive heliotropism).
See also: 向日性
植物の根は背日性を示すことがある。
Plant roots sometimes exhibit negative heliotropism.
背日性は向
Negative heliotropism is the opposite of positive heliotropism.