BIOMOLECULES AND ENZYMES

Detailed explanation-1: -With their application in crop production, auxin herbicides started a new era of weed control in modern crop production due to their systemic mobility in the plant and to their selective action, preferentially against dicot weeds in cereal crops.

Detailed explanation-2: -The hormone-like herbicides such as 2, 4-D, 2, 4, 5-T, dicamba, and picloram provide essential tools for modern farming for control of undesirable vegetation on grazing land, in crop, and non-crop lands. When used as recommended, these herbicides pose little or no hazard to the natural environment or man.

Detailed explanation-3: -Auxin herbicides preferentially control dicot weeds. An exception to this phenomenon is the selective auxin herbicide quinclorac, which additionally controls important grass weeds, such as Echinochloa, Digitaria, Setaria and Brachiaria spp., in rice.

Detailed explanation-4: -The auxins which are widely used as herbicides are 2, 4-D and 2, 4, 5-T.

Detailed explanation-5: -Commercial use of auxins is widespread in plant nurseries and for crop production. IAA is used as a rooting hormone to promote growth of adventitious roots on cuttings and detached leaves. Applying synthetic auxins to tomato plants in greenhouses promotes normal fruit development.