Monday, December 8, 2014

Memory in Plants

"In the mimosa we find memory, but no consciousness. Memory of course involves no image in the plant... Memory has nothing to do with nerves or brain. It is a primal quality."
 ~ Friedrich Nietzsche

When we say that plants have memory it means that they have a past, "which they bear in their extended being and which they may access at any given moment," writes Michael Marder in Plant-Thinking. He gives two examples:

Barley leaves will unfurl if they are exposed to red light, so long as they contain calcium. If calcium is removed from the plant, the leaves will not unfurl. Yet, if the calcium is added a couple hours later, the plant will unfurl without the red light shining, "remembering" how it had shone earlier.

Plantlets of flax, likewise, respond to the stress of drought or wind by depleting calcium from their cells in a process that takes about a day, and yet they will continue to remember the traumatic event for up to a week as evidenced by their calcium depletion.

"These examples demonstrae that what Nietsche chanced upon in his reflection on the mimose is in fact a more general tendency of vegetal beings to store imageless and non-representational material memories in their cells, and so to retain a trace of the remembered thing iteslef, in place of its idealized projection," Marder concludes.

A Philosophy of Vegetal Life
by Michael Marder
Columbia University Press, 2013
Plants and Seeds
Plant Roots: Growth, Function and Interactions with the Soil
Artwork: Magical Mimosa by Jessica Jenney

Monday, December 1, 2014

Less Fertilizer, More Nutrition.

Giving too much phosphorus to wheat and barley plants has been shown to raise the amount stored as phytate, rather than as more digestible forms of phosphorus. This finding is important for two reasons:

    * Livestock that are fed high-phytate grains excrete more phosphorus in their manure, which can pollute water.
    * Phosphorus is a finite resource that could be irreplaceable once it has been thoroughly mined -- which could happen in the next 25 years.

The researchers found that soil phosphorus levels may affect grain phytate levels as much as plant breeding can, offering two complementary solutions to the nutritional and environmental problems caused by high phytate levels in grains. Besides being more environmentally sound, getting the application rate for phosphorus fertilizers just right might improve the nutrients delivered by grain crops such as wheat and barley.

Not only is the phosphorus in low-phytate grain crops more digestible by people, but low-phytate grains free up minerals essential to human nutrition: zinc, manganese and iron.

Source: Agricultural Research Service

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