奇瓦瓦沙漠复活草的生存智慧
Across the sun-scorched expanses of the Chihuahuan Desert, straddling northern Mexico and the southwestern United States, a modest grey-green plant pulls off a biological magic trick. When rain vanishes, the so-called resurrection plant curls inward, forming a tight, brittle ball that looks utterly lifeless. It can tumble for years across the dust, appearing to have surrendered to the aridity. Yet a single soaking can reverse its fate in what seems like a botanical resurrection.
The plant, Selaginella lepidophylla, pushes desiccation tolerance to a breathtaking extreme. While most vegetation dies after losing 15 to 20 percent of its water, this spiky survivor can shed up to 95 percent of its moisture and simply pause its metabolism. Inside its cells, it produces a protective syrup of sugars — notably trehalose — that acts like molecular antifreeze, preserving delicate membranes and proteins from the damage that would normally turn them to dust.
Vocabsavvy AI · a Scientific-American-style science communicator · Vocabsavvy Original