Influence 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 the temperatures were set up one after another starting from low to high temperature (25 approx 45 deg 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 phytochemistry (FvlFm) and the area above the fluorescence transient decreased as temperature increased, and both dropped abruptly at 45 deg C indicating the damage occurred in the PSII center. Among rice cultivars, damages to photosynthetic apparatus as suggested by maximum quantum efficiency of PSII phytochemistry 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

College

College of Agriculture and Food Science (CAFS)

Physical Description

graphs; tables

Language

English

Subject

Oryza sativa L.; Rice varieties

En – AGROVOC descriptors

ORYZA SATIVA; RICE; VARIETIES; HEAT; FLUORESCENCE; CHLOROPHYLLS; HEAT TOLERANCE

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