INFLUENCE OF TEMPERATURE ON INCOMPATIBLE AND COMPATIBLE POLLEN TUBE GROWTH IN LILIUM LONGIFLORUM

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Abstract
Compatible and incompatible pollen tubes were grown in detached styles of 4 cultivars of Lilium longiflorum at 5 temperatures ranging from ll[degree]C to 39[degree] C. In a 48 hr. incubation period, compatible pollen tubes increased in length with increasing temperatures up to 30[degree] C; at 30[degree] C and 39[degree] C they traversed the length of the style and reached the top of the ovary. Incompatible pollen tubes showed typical inhibition only at room temperature (24[degree] C). Incompatible tubes grew completely through the style and were indistinguishable from compatible pollen tubes at 39[degree] C. While at 30[degree] C, although shorter than compatible, the incompatible pollen tubes grew farther than any tubes at room temperature or lower. Incompatible pollen tubes at 19[degree] C were somewhat shorter than compatible but nearly as long as incompatible tubes grown at 24[degree] C. No distinction could be made between compatible and incompatible pollen tubes at 11[degree] C.