Download Botany for Gardeners, Rev Ed by Brian Capon PDF

By Brian Capon

A bestseller on the grounds that its debut in 1990, this critical and convenient reference has now been elevated and up to date to incorporate an appendix on plant taxonomy and a entire index. dozen new pictures and illustrations make this re-creation even richer with info. Its handy paperback structure makes it effortless to hold and entry, no matter if you're in or out of the backyard. a necessary evaluation of the technological know-how in the back of crops for starting and complicated gardeners alike.

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Extra info for Botany for Gardeners, Rev Ed

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Plants that photosynthesize use autotrophic nutrition (auto-, “self”). Only when a seedling’s first leaves are lifted into the light does the plant become autotrophic. It is a major switch in behavior from being dependent on foods provided by the seed to becoming an independent organism. Once begun, photosynthesis will produce all the food that the plant will ever again need. Germination officially ends when the shoot emerges from the soil. Subsequent seedling development includes stem growth, complete expansion of the first leaves—the minute pair, first seen inside the bean seed—and, underground, proliferation of the root system by repeated branching.

The principal function of stems is to support leaves in such a way that maximum amounts of light can be captured for photosynthesis. Shoot systems are generally capable of producing unlimited numbers of branches. Only a small percentage of their axillary buds grow at any one time; the remainder lie dormant, perhaps for years, to act as points of reserve growth in case apical buds are destroyed by disease, frost, wind, or animals. They are also there, ready to grow, after gardeners prune their plants.

This band is formed by thousands of projecting root hairs. Root hairs are extensions of the outer root cells and increase, by several hundred-fold, the organ’s absorptive surface area. Their presence increases the rate of water uptake proportionally. Root hairs are easily broken when a root is dug from the soil but can be seen on seedlings (radish is ideal) grown on a moist paper towel in a covered dish for about five days. The width of the root hair zone remains constant. During continued root growth, new hairs form just above the growing tip while old ones, at the top of the group, shrivel and die.

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