叶面反转度(Downward-rolling degree of tea leaf)茶树叶片沿主脉向背面反转的角度。叶片形成中,当叶片处于内折时,叶背受阳光照射强,叶背表皮细胞分裂、生长相对缓慢,而背光的叶片上表皮细胞生长相对较快,使叶片逐步平展,继续至反转。反转的程度因品种、环境条件及栽培管理技术而异。
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