동화상내 공기유입속도의 변화에 따른 벼의 광합성 반응

This study was conducted to investigate photosynthetic response to four sequential air influx rate with rice(Oryza sativa L.) plants moved from a natural condition to constant condition with automatic regulation selected environmental variables on 13th∼15th days after anthesis. In time course of photosynthetic response to increasing air influx rate(200-280-360-440 ㎖/min.), stomatal conductance decreased rapidly at the beginning after treatment and then oscillated with a free-running period of a approximately 1 hour to 1 hour 30 minutes until reached up to steady-state condition. Similar change was also observed CO₂ assimilation rate. Stomatal conductance decreased throughout the air influx rate sequence, but the rate of decrease was similar to the decrease in CO₂ assimilation rate observed under continuous air influx rate conditions. In starch granules during grain filling period under air influx rate(440 ㎖/min.), compound starch granules were loosing and a number of hollows were observed in surface of single starch granules. Evidences from several approaches indicate that synchronization of stomatal conductance and CO₂ assimilation rate was closely inter-related under increase of air influx rate and increase of air influx rate influenced the CO₂ uptake in photosynthetic processes and compound starch granule, as $quot;end products$quot; of photosynthesis.