The cell surface reduced nicotinamide adenine dinucleotide (NADH) oxidase activity of soybean stems and of pea and cucumber tendrils responded to touch with a several‐fold increase in activity. The increase in NADH oxidase persisted for 20 min or longer, and further touch stimulation during this period did not alter activity. With soybean sections, the specific activities in response to touch approximated those achieved maximally by auxin. Where the NADH oxidase was fully stimulated by 2,4‐d, the NADH oxidase failed to respond further to touch. The findings indicate that the NADH oxidase of the plant cell surface is involved in the growth response to touch and in tendril coiling.

中文翻译：

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豌豆和黄瓜卷须和大豆下胚轴切片的触敏 NADH 氧化酶活性

细胞表面降低了大豆茎和豌豆和黄瓜卷须的烟酰胺腺嘌呤二核苷酸 (NADH) 氧化酶活性，触碰后活性增加数倍。NADH 氧化酶的增加持续了 20 分钟或更长时间，并且在此期间进一步的触摸刺激不会改变活动。对于大豆切片，响应触摸的特定活动与生长素最大程度地接近。在 NADH 氧化酶被 2,4-d 完全刺激的情况下，NADH 氧化酶无法进一步响应触摸。研究结果表明，植物细胞表面的 NADH 氧化酶参与对触摸的生长反应和卷须卷曲。