[Changes of photosynthesis parameters and chlorophyll fluorescence around sprout tumble of Pinellia ternata under high temperature stress].
OBJECTIVE
To study the change of photosynthesis and chlorophyll fluorescence characteristics of Pinellia ternata around sprout tumble.


METHODS
Tubers of P. ternata were cultured firstly at (25 +/- 1) degrees C for certain days, and then they were coerced under 37 degrees C stress in the same artificial climate boxes. The chlorophyll contents, photosynthesis and chlorophyll fluorescence during different stages of high temperature stress were measured.


CONCLUSIONS
After under high temperature stress, the chlorophyll contents, the ratio of chlorophyll a/b, photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), maximum fluorescence (Fm), quantum yield of PS II (phi (PS II)), intrinsic photochemical efficiency of PS II (Fv/Fm) and the chlorophyll photochemical quenching (qP) decreased, but the intercellular CO2 concentration (Ci), minimal fluorescence (F0), the chlorophyll nonphotochemical quenching (NPQ) increased.
College of Biology, Huaibei Normal University, Anhui Key Laboratory of Plant Resources and Biology, Huaibei 235000, China. xuejp2000@yahoo.com.cn
Jianping
J
Xue
Xing
X
Wang
Aimin
A
Zhang
Li
L
Chang
D002734:Chlorophyll / Q000737:chemistry* / Q000378:metabolism; D000077194:Chlorophyll A; D005453:Fluorescence; D006358:Hot Temperature; D010788:Photosynthesis; D030021:Pinellia / Q000737:chemistry* / Q000502:physiology*; D010936:Plant Extracts / Q000737:chemistry / Q000378:metabolism; D013312:Stress, Physiological
D010936:Plant Extracts; D002734:Chlorophyll; D000077194:Chlorophyll A