METHOD: Life Cycle CONDITIONS: Green House - 14h light at 32-45C (hot) or 18-22C (temperate) METHOD NARR: See 1992 trial in separate entry. In the 1993 trial the heat regimens were initiated when flowering had generally become ae vents were adjusted each day so that night time minimum remained the same after initiation. This trial concentrated on flowering abundance and data was collected only once after three weeks. Pollen viability was scored. determined, and some plants were intermated within their experimental unit. Styles were collected after 3 days to determine pollen tube penetration. RESULTS NARR: Temperature significantly affected flowering. Species vary some actually showing an increase in flowering (mcd and cmm). Stylar examination provides useful information about relative pollen potency not revealed by shed or PSP. Selection for heat fertility is not a good indicator of vegetat AUTHOR EXPLANATION: Daily heat exposure was somewhat more severe and consistent in the 1993 experiment. The accessions with the best flowering did not necessarily have the best shed, and those with the best flowering,have the best pollen tube growth through the style. THis indicates that these factors need to be screened for individually.