Day 334: Although not a species of concern, Spiranthes romanzoffiana (Hooded Ladies' Tresses) is sufficiently uncommon that when I found it blooming in an off-trail area, I decided it would be a good subject for my daily post. We are fast approaching the time of year when I start having difficulty finding "blog shots" on my outings; we're not there yet, but it won't be long before the snow flies. It always makes me wonder how seemingly "delicate" plants survive the bitter subalpine/alpine winters, buried in snow for eight or nine months of the year. The secret lies within their cells, literally. As you may know, plain water freezes at 32 degrees. If you add sugar to it (let's say you're making Kool-Aid popsicles), the freezing point is lowered. Since plants normally contain certain amounts of sucrose within their cells (variable depending on the plant), this affords some minor protection. Hardier plants may also contain a type of "antifreeze protein" which prevents freezing in the spaces between their cells. Others may have a greater level of lipids (fats) in their cell membranes, again a factor in creating a lowered freeze point. When you get to the bottom line, you'll find that those dainty little wildflowers are much better equipped to withstand cruel winters than you are. Ain't Nature grand?
No comments:
Post a Comment