Effect of Auxins on the Flowering Behaviour of Rice

Abstract

IN a recent paper, Hussey and Gregory¹ reported that in two experiments out of four carried out, low concentration of auxin increased the number of flower primordia, while high concentration decreased it in winter barley. These results confirm the findings of Leopold and Thimann² in winter barley; but in petukus rye the flowering behaviour was not affected by the auxin treatment. In discussing these results, Hussey and Gregory defined the meaning of flower initiation and promotion of flowering, and expressed the opinion that auxin had no effect on the initiation of flowering, as auxin injection in an unfavourable photoperiod did not show initiation of flower primordia.