Once fertilization has taken place, the energies of the plant are directed to the successful development of the next generation. The fertilized egg cells are safely protected from the vagaries of climate, or damage by passing insects, by the surrounding mass of the ovary which lies at the base of the now fading flower.

Each part of the ovary has its own role to play in the growth and development of the new seed. Despite a few basic differences, the pattern followed by the growing embryo is characteristic of all plants. At fertilization the egg is made up of a single cell, but this soon begins its growth by dividing into two identical cells. Read the rest of this entry »

How remarkable it is that the single cell that begins the life of a plant can develop in such an immense variety of ways. Looking at k a newly fertilized cell within an ovary, it is not possible to tell whether it will develop into a tiny alpine plant only a few centimetres high or a giant Californian Redwood (Sequoia sempervirens) over 100 metres tall. The beginnings are the same, but as that one cell grows and divides so the characteristics of the new plant emerge. If it is to be an annual and complete its life-cycle within a year, then there is no need for elaboration of stem cells to give strength and durability. Read the rest of this entry »