植物根系向地性是决定根系空间生长趋势的主要因素之一，对于养分吸收具有重要影响。
Gravitropism of plant roots is one of the important factors determining the spatial pattern of root growth and thus may have a great effect on nutrient uptake.
呼吸根：指由某种水生维管植物产生的特化的负向地性根(尤其如红树，如海桑属)，在土壤之上生长良好。
Pneumatophore aerophore; breathing root a specialized negatively geotropic root produced by certain aquatic vascular plants especially trees such as mangroves, e. g.
呼吸根：指由某种水生维管植物产生的特化的负向地性根（尤其如红树，如海桑属） ，在土壤之上生长良好。
Pneumatophore ( aerophore ; breathing root ) a specialized neg atively geotropic root produced by certain aquatic vascular plants ( especially trees such as man groves, e. g.
ATCC 15834菌株诱导牛膝产生的毛状根可在无任何激素的MS培养基上快速生长，且具有分枝性强、丛生、无向地性等特点。
The hairy roots transformed by ATCC15834 grew rapidly on MS medium without any phytohormones, and were characterized by strongly branching, clustering and non-geotropism, etc.
ATCC 15834菌株诱导牛膝产生的毛状根可在无任何激素的MS培养基上快速生长，且具有分枝性强、丛生、无向地性等特点。
The hairy roots transformed by ATCC15834 grew rapidly on MS medium without any phytohormones, and were characterized by strongly branching, clustering and non-geotropism, etc.
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