亚高温下不同空气湿度对番茄光合作用和物质积累的影响

为了研究亚高温下不同空气湿度对番茄植株光合作用及物质积累的影响,本试验利用人工气候室,在11:00—15:00平均温度为33℃的亚高温条件下,设置3个空气相对湿度处理,分别为70%～80%(高湿)、50%～60%(中湿)和不加湿的30%～40%(低湿)。结果表明:在处理25d时,高湿处理番茄叶片叶绿素含量、净光合速率显著高于低湿处理,而低湿处理果实空洞率比高湿处理高18.4%(P<0.05);在33℃亚高温条件下,70%～80%的相对湿度有利于光合作用的增强和果实品质的提高。

Effects of air humidity on tomato plant photosynthesis and dry matter accumulation at sub-high temperature

An experiment with growth chambers was conducted to study the effects of air relative humidity (RH) on the photosynthesis and dry matter accumulation of tomato plant at 33 ℃ from 11:00 to 15:00. Three treatments were installed, i.e., 70%-80% (high RH), 50%-60% (medium RH), and 30%-40% (low RH, control). After treated for 25 days, the tomato leaf chlorophyll content and net photosynthetic rate in treatment high RH were significantly higher than those in treatment low RH, while the empty rate of tomato in treatment low RH was 18.4% higher than that in high treatment RH (P<0.05), suggesting that at sub-high temperature 33 ℃, 70%-80% air relative humidity could benefit the improvement of tomato photosynthesis and fruit quality.