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Testa

释义 Definition

testa（植物学）指种皮、种子外层的硬壳，起保护胚和调控吸水等作用。（在某些语境中也可泛指“外壳/硬壳”；解剖学里偶见作拉丁词用法指“头骨/颅骨”。）

发音 Pronunciation

/tst/

例句 Examples

The bean’s testa is tough and protects the embryo.
豆子的种皮很坚韧，能保护胚。

During germination, water first enters through tiny openings in the testa, triggering enzymes that fuel early growth.
在发芽过程中，水分会先通过种皮上的微小孔隙进入，激活酶，从而为早期生长提供能量。

词源 Etymology

来自拉丁语 testa，原意为“陶罐、瓦片”，引申为“硬壳、外壳”；后来被植物学借用来指“包裹种子的硬外层（种皮）”。

相关词 Related Words

文学与著作 Literary Works

Biology of Plants（Raven, Evert & Eichhorn）讲解种子结构时常用 testa
Plant Systematics（Michael G. Simpson）描述种子形态性状（含种皮）时使用 testa
Seeds: Physiology of Development and Germination（Bewley & Black）讨论种皮对吸水、休眠与萌发影响时使用 testa

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