Day: June 30, 2022

EFFECT OF TEMPERATURE ON THE PHYSIOLOGY OF PLANTS

Transpiration:  The rate of transpiration increases with rise in temperature. Extremely high temperature, if prolonged, may cause water stress to plants.

Vernalization: many species plants require low temperature treatment for seed germination and flowering, a phenomenon known as vernalization.

TEMPERATURE BASED ZONATION

Latitudinal zones: As many as six temperature-based terrestrial latitudinal zones are differentiated north of equator, each being characterized by specific vegetation type e.g. Snow, tundra, coniferous forests, deciduous forests, grasslands or deserts and tropical rainforests.

Altitudinal zones: As many as four temperature based terrestrial altitudinal zones are differentiated in Himalayas, each having specific vegetation type. Alpine (having Rhodendron, Juniperus),temperate (mainly conifers, oaks and Magnolia),tropical and subtropical zones (having mixed forests, bamboos, sal, etc.