geotropism

1. The main stems of a plant show negative geotropism as they grow upwards.
   植物茎往上长时表现出负向地性。
2. Experimental result show that tree model rendered by the improved algorithm can reflect tree's space combination, and reflect the characteristic of phototaxis, geotropism and FCFP. The algorithm improves the realistic of trees.
   实验结果表明，采用以上改进算法建立的树木模型，能较好地反映树木的空间特性，并且可以体现出树木的趋光性、屈地性及顶端优势等特征，具有较高的真实感。
3. The geotropism growth was a response of hypha to gravity and the geotropic sensitive was at the hyphal apex.
   试验证明：丛枝菌根真菌菌丝延伸生长部位是菌丝尖端，其生长的向地性是对地心引力的感应，感应的敏感部位也在生长菌丝的尖端。
4. Induced hairy root are tender, white, thin, and rapid speed, have many branchs, many root hairs, submit cluster and lose geotropism.
   诱导获得的毛状根嫩、白、细、生长速度快、多分枝、多根毛、呈丛生状，并失去向地性。

noun

1. an orienting response to gravity