How to Build a Plant

A few years ago, my father said something that completely changed how I look at plants: seeds are living instructions for building a plant out of soil, air, and water.

I was fascinated, and though I am by no means a biologist, my curiosity led me to do some research. What I found still seems pretty mind-boggling from my inexpert view.

Organic life is pretty amazing. For both plants and animals, you start with a tiny cell that is fertilized by another tiny cell. And poof! You have started a chain of reactions that makes those tiny things into something potentially very big. Those tiny cells themselves each have the instructions on what to do if they encounter a hospitable environment. With plants, a pollen grain lands on a flower - specifically the stigma for those who remember junior high science class and if the stigma picks up that it is the right species, it allows it to germinate by providing water and nutrients. It can tell if it is the right species or not if the proteins on the stigma match the proteins on the pollen grain – like puzzle pieces.  Once the pollen and stigma recognize each other and the fertilization process begins, the real magic happens inside the cells. What makes this possible is DNA—the complete instruction manual for life, carried in every single cell.

So, does that mean that every cell is full of instructions and not just the ones that when you combine them, make something alive that turns into a whole COLLECTION of cells? The answer is - yes; that is actually what DNA is, which makes up all organic life. Each cell in and organism carries the complete set of instructions, even though it may only use a small portion of them depending on its role. A skin cell has the same manual as a heart cell or a leaf cell, but it only reads the chapters it needs to do its particular job. In a way, this is like every member of an orchestra holding the entire score of the symphony, but each instrument only playing its part when it is time. Back when I first learned about cells in school, I didn’t yet grasp the elegance of this arrangement. At the time, it was just another fact among many, rather than a wonder worth pausing over.

When I was in junior high school learning about cells and plants for the first time, the sheer amazingness of this process wasn’t something I noticed. I don’t remember what I learned about science in school prior to 7th grade, but I am certain it was nothing like this. I may have been learning so many new things at the time that it turned into just one of the many amazing things I was learning. Now the process feels so fascinating that it seems it should have been presented with jazz hands and “ta-dah’s.” That sense of orchestration becomes even clearer when you look at what a seed actually does with the raw materials around it.

Plant cells are amazing and magical. It truly seems like building something to me – “I’ll take a little bit of this (the chemicals found in the soil), a little bit of that (water that plumps up the cells), and a touch of the invisible (carbon dioxide pulled from the air. From the soil, roots draw up minerals like nitrogen, phosphorus, and potassium, along with tiny but vital traces of iron, magnesium, and calcium.

Each has its role: nitrogen helps the plant build proteins, phosphorus supports the transfer of energy through ATP, and potassium helps regulate water balance within cells. Water not only hydrates the cells but also carries these nutrients where they need to go and helps keep the plant upright through pressure in its cells. Then the leaves gather carbon dioxide from the air, and with the help of sunlight, turn it into sugars through photosynthesis. Those sugars are both fuel for energy and raw material for building everything from cell walls to flowers—like both the electricity and the bricks for life’s construction project. Piece by piece, molecule by molecule, the plant uses these raw ingredients to build roots, stems, leaves, flowers, and fruit—an entire living architecture rising out of what seems, at first glance, like dirt, water, and air.

My perspective of organic life as a whole changed because of that short conversation. It didn’t change the trajectory of my life, but it certainly made me appreciate more how impressive our planet is and how beautiful and graceful the processes are that make the earth what it is.

I often think back to my father’s remark about seeds as living instructions. What seemed like a casual comment is now a reminder that the extraordinary often hides in plain sight.

The right series of chemical reactions billions of years ago started all this. It is a staggering amount of time that this process has been going on – and is still going on. Sometimes I still think of seeds as little alien machines carrying coded instructions. But maybe that’s what life really is: a kind of ancient technology the Earth invented long before humans ever dreamed of writing code.