noun
negative heliotropism; negative phototropism
Biological term for growth or movement away from light; opposite of 向日性 (positive heliotropism). Related to 背日性, which specifically refers to sunlight.
See also: 背日性
植物の根は背光性を示すことがある。
Plant roots sometimes exhibit negative phototropism.
背光性
Negative phototropism refers to growth away from light.
背日性 is a synonym for negative heliotropism, specifically with respect to sunlight. 背光性 is a broader term for any light source.
Compound of 背 (hai, 'turn one's back on') + 光 (kou, 'light') + 性 (sei, 'property'). A modern scientific coinage.