BIOMOLECULES AND ENZYMES

Detailed explanation-1: -The primary effect of gibberellin action may occur in the cotyledons, where its role in the breaking of seed dormancy may be in the induction of increased levels of activity of certain enzymes, particularly those concerned with the mobiliz-ation of the cotyledonary oil reserves.

Detailed explanation-2: -Gibberellin is the other major phytohormone with an important role in the regulation of seed dormancy and germination (Finch-Savage and Leubner-Metzger, 2006). The level of biologically active GAs in plant tissues is determined by the balance between its biosynthesis and inactivation (Yamaguchi, 2008).

Detailed explanation-3: -Gibberellins are produced in greater mass when the plant is exposed to cold temperatures. They stimulate cell elongation, breaking and budding, seedless fruits, and seed germination. Gibberellins cause seed germination by breaking the seed’s dormancy and acting as a chemical messenger.

Detailed explanation-4: -Exogenous application of gibberellic acid (GA(3)) to intact fresh seeds was effective in breaking dormancy, with > 70% of seeds germinating when treated with 5.2 mM GA(3) and incubated at a day/night temperature of 30/20 degrees C for 20 weeks.