Effect of High Temperature on the Tomato Growth

Through natural high-temperature treatment on tomato plants,changes of growth hormones and reproductivein tomato under conditions of high temperature stress were studied.The results showed that with the temperature increasing(up to 45℃ during 11:00 to 15:00),chlorophyll a content in leaves of tomato plants decreased significantly,and proportion to the temperature intensity,Therefore,plant photosynthesis was declined;respiration was enhanced,SOD activity decreased,POD activity increased,and free radical scavenging capacity decreased.It was also inhibited the development of flower,the pollen viability,pollen number and fruit set.High temperature condition would also cause elongating of anther tube style leading to poor pollination and reduced seed set.