[Recovery effect of tomato leaves photosynthesis and chloroplast ultrastructure after a short-term low nocturnal temperature].
Tomato seedlings were treated with 15 degrees C (control), 12 degrees C, 9 degrees C, and 6 degrees C at night for seven days to study the changes of their leaf photosynthesis and chloroplast ultrastructure, aimed to make sure the recovery effect of the photosynthesis of tomato leaves after a short-term low nocturnal temperature. The results showed that short-term low nocturnal temperature was favorable to the photosynthesis of tomato leaves at recovery stage. The chlorophyll content could recover to the normal level as control under the treatments of 12 degrees C and 9 degrees C, but not under the treatment of 6 degrees C. The formation of stoma was not seriously inhibited by low nocturnal temperature. On the contrary, the stoma formation and its growth were stimulated at recovery stage. Under the treatment of 6 degrees C, chloroplast grana layers arranged loosely, and their number reduced. In the seven days of recovery, the lower the treatment temperature, the smaller and the fewer the starch grains were, and the more compact and tidy the chloroplast grana became. In addition, the transportation of photosynthesis products was promoted after short-term low nocturnal temperature.
Li
Guo-Qiang
GQ
Liaoning Provincial Key Laboratory of Protected Horticulture, College of Horticulture, Shenyang Agricultural University, Shenyang 110161, China. ligq0000007@126.com
Li
Tian-Lai
TL
Liu
Ai-Qun
AQ
D002736:Chloroplasts / Q000648:ultrastructure*; D003080:Cold Temperature; D018551:Solanum lycopersicum / Q000378:metabolism / Q000502:physiology*; D010788:Photosynthesis / Q000502:physiology*; D018515:Plant Leaves / Q000378:metabolism; D018526:Plant Transpiration; D036226:Seedlings / Q000378:metabolism / Q000502:physiology; D013997:Time Factors