Effects of Some Acids on Rice Glume Opening

The effects of immersing ricepbanicles in various concentrations of sevelal acids on the glume opening and vitality of pollens were observed. we foundthat glume opening could be promoted byformic acid, acetic acid and propanoic acid between 0. 5% ~ 8% concentration . Formic acid (0. 5% ~ 1. 5%),acetic acid (0. 5% ~ 2%) andpropanoic acid (0. 5% ~ 2%) had nobad effect on glumes. Though hydrochoric acid, nitric acid and sulphuric acid could also promote glume opening atcertain concentration, their acidity wereso strong that the glumes were damagedseriously and the pollenns would lose vitality. In addition, salicylic acid and malic acid at certain concentration couldpromote glume coping too (Tables 1,2). Acid may enhanced the loosening ofcell wall of lodicule epidermis so thatlodicules became inflated after absorbingwater. In thes way, glume opening inrice was promoted. The effect of acid onglume opening was affected by temperature. The speed of glume opening increased with in increase of temperatureup to 40℃. The parts which acid reactedon was the lodicules (Table 4). Time ofglume opening by acid inducting wasabout 30 s(Table 5). The inductive effect of acid could be inhibited by respiratory inhibitor NaN3.