Influece of high temperature on chlorophyll fluorescence and its varietal variation in rice

Issue Date

4-2017

Abstract

This study was carried out to find varietal response to heat stress by chlorophyll fluorescence. Chlorophyll fluorescence is closely correlated with photosynthetic rate. Field-grown rice were dug up at the grain filling stage and moved to the plant growth chamber, where temperatures were set up one after another starting from low to high temperature (25-45˚C). Fo, Fm and Fvl Fm were measured after the first dark-adaptation, and OJIP transient was measured after the second dark-adaptation. Results showed that, in all cultivars, maximum quantum efficiency of PSII photochemistry (FvlFm) and the area above the fluorescence transient decreased as temperature increased, and both dropped abruptly at 45˚C indicating the damage occurred in the PSII center. Among rice cultivars, damages to photosynthetic apparatus of Donjin2 and Anda seemed to be lower than the other even under elevated temperature as suggested by maximum quantum efficiency of PSII photochemistry and OJIP transient curves, which imply the presence of varietal variation in heat tolerance of rice photosynthesis.

Source or Periodical Title

Philippine Journal of Crop Science

ISSN

0115-463x

Volume

42

Issue

1

Page

59-68

Document Type

Article

Frequency

tri-quarterly

Physical Description

tables, graphs

Language

English

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