Influence of Antibiotics on the Extension in Lamina Joints of Rice Plants.

[摘要] In this communication, stimulating or inhibiting effects of antibiotics, sodium ion and potassium ion on the extension of lamina joints are proved. When the sodium ion is applied in the test solution by Na2HPO4, the cation slightly inhibits the extension of lamina joints at the concentration of 40 me/l, but by NaCl any inhibiting effect is not revealed at the same concentration (table 1). Potassium ion has a stimulating effect on the extension when it is applied at 25×10-4 M of potassium maleate (table 2). Actidione, aureothricin, blasticiolin S, fermicidin and gramicidin S exhibit conspicuously an inhibiting effect upon the extension (table 3). Yet it is characteristic that the extension is slightly accerelated by novobiocin (table 4). The inhibiting effect of gramicidin S is particularly feeble upon the growth of intact rice plants (table 5). Any synergistic action, which is induced by mixture of gibberellin and IAA, is not detectable between novobiocin and IAA (table 6). In addition, the novobiocin has not a stimulating effect as that of gibberellin on intact rice plants (table 7).

[学科分类] 农业科学（综合）