Abstract
SUMMARYThe quantity of nectar sugar secreted by excised Antirrhinum flowers was reduced when indolyl-3-acetic acid (IAA) was added to the culture solution at 5 × 10−4M concentration. The volume of fluid was reduced by IAA in culture solutions containing 5–20% sucrose, but increased by IAA in pure water or dilute sucrose solutions. Pre-treatment with IAA produced the same effects as constant exposure. Calcium and potassium ions modified the action of IAA on water excretion. Nectaries of IAA-treated flowers differed in microscopic appearance from those of controls, and resembled the nectaries of flowers cultured in pure water. A dual effect of IAA on sugar and water excretion is inferred and, as a corollary, a partial independence of movement of the solid and liquid components of nectar. The evidence is not conclusive as to whether IAA affects the secretory mechanism directly, or the transport of sugar to the nectary.
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