| Abstract |
High temperature is an important limiting factor for the growth and development of
rice cultivation worldwide. The current research aimed to investigate the efficiency of PSII
system, photosynthetic changes in photosynthetic pigments and membrane stability in Thai
seedlings of Thai rice cv. Riceberry after exposure to different temperatures viz., 25, 30, 35, 40,
45, 50 and 55oC for 30 min. The experiment was designed in CRD with four replications. The
results showed that the highest Fv/Fm was realized when seedlings were exposed to 30oC and
35oC and decreased when exposed to 40oC for 30 min. The content of photosynthetic pigments
such as total chlorophyll (TC) and chlorophyll a (Chl a) were the highest after short-term
exposure to a temperature of 25oC. However, the contents of all photosynthetic pigment such
as TC, Chl a, Chl b and carotenoids were the lowest when exposed to 55oC for 30 min. The
membrane stability of Riceberry seedlings affected on short-term exposure to temperatures of
50oC and 55oC. Thus, Fv/Fm and Hill reaction were the first mechanisms to be significantly
affected by the short-term exposure to a temperature of 40oC followed by membrane stability
and contents of photosynthetic pigments which were affected by short-term exposure to
temperature of 50oC -55oC and 55oC, respectively. |
Publication
Journal Publication
ไทย