Exogenous application of amino acid proline on three rice varieties under aerobic condition
2018
Agalos, S.Q. | Gonzales, M.A.
Proline is an amino acid known as precursor of 2-acetyl 1-pyrroline (2AP) that carries such fragrance in rice grains, and plays an important role in plant metabolism and development in various type of stresses such drought (John Pitchel et. al. 2012). Three rice varieties representing different types: aerobic non aromatic (NSIC Rc192), white aromatic (E9) and pigmented aromatic (P14) studied to determine the effect of different levels of proline on their growth and yield in aerobic conditions. Analytical grade proline from Sigma Aldrich was used as foliar application at 150ppm, 450ppm and 750ppm dose levels (with 0.1% Tween-20 solution each level) during 30 DAT and during the flowering stage of the three varieties. The experiment was laid out in split plot RCBD. Both leaf and grain aroma was rated by 16 evaluators based on test scale 1- absence of aroma, 2-slight aroma, 3-moderate aroma and 4- strong aroma. The different varieties have varied responses with the different concentrations of proline application. E9 contains slight aroma in the control while the rest of the treatments was rated moderate to accumulated during the leaf and aroma tests but there is higher level of aroma accumulated during the leaf stage. Growth rate increases as the dosage level increases from 150 ppm and 450 ppm, however, the highest concentration (570 ppm) had low growth rate than the dosage level 450ppm due to more pest infestation and disease.
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