One thing expected of science fiction authors is they should “invent” something, although obviously only in fiction. Remember the Star Trek “communicator”, which now is recognizable as a flip-open cell phone. In other words, Star Trek anticipated it. How? Well, obviously, as with other real inventions, there was a need. People exploring need to communicate with others, so they had a communicator. Obviously, you want it to be small and convenient, so it was small and convenient.
So, what has this got to do with me? Well, in my novels about the colonization of Mars, there were obvious things that had to be done, and one of these was I thought it desirable to have some sort of plant that would live outside of specialized domes. The reason for this is that people badly need the products of plants, and it would be really helpful if you could grow something out in the wastes. This led to the need to “invent” a plant that could grow outside, and hence the genetic engineers developed the “Mars cactus”. So what would it look like?
One thing that a Mars cactus would not need is spikes. No need to defend against plant eaters because there aren’t any. Obviously it had to defend itself against the bitter cold of night, so what I envisaged was a thick-skinned plant that was more like a “flat rock”, and was very thick. Inside, it had antifreeze. It would still need water, so to start with, some form of watering had to be carried out, and more on that in a later post. The next thing it needed was protection against the UV light, and it needed to absorb heat, and fortunately both of these could be achieved with a dark absorber. Many plants on earth actually have UV absorbers. Also, it had to make something useful, but fortunately it is not that difficult to envisage a plant containing cellulose.
However, the really big problem is any plant growing outside has to be able to reproduce to be useful, so I envisaged what I thought was a sneaky strategy, based a little on my experience with seaweeds. Seaweeds have an interesting sex life. They have male and female forms, and these reproduce if they can be close enough together to fertilize each other. Seaweeds, of course, have the advantage that the water currents may et the gametes get together. The offspring of such fertilization are sporophytes, which do not need fertilizing and they send out clouds of spores that if they take hold of anything, they grow into the male and female forms.
So, my Mars cactus had the following reproductive strategy. It grew tendrils underground, and if these touched a tendril of the opposite sex, an entity grew that would reach up and grow on the surface and when mature would send out clouds of spores. The spores would settle, dig into the ground, and form the tendril form. Does that seem plausible? You may think that is ridiculous, but, as I found out later, it is quite plausible. It is, after all, the reproductive strategy of the mushroom, and mushrooms, and other fungi, have existed for a very very long time. Not reinventing the wheel, perhaps, but reinventing the fungus.