Acta Physiologiae Plantarum

, 40:173 | Cite as

Effect of short-term heat exposure on physiological traits of indica rice at grain-filling stage

  • Payu Pansarakham
  • Paweena Pongdontri
  • Piyada Theerakulpisut
  • Anoma DongsansukEmail author
Original Article


Heat stress impacts the quantity and quality of rice grains, particularly during grain-filling stage needed for grain development. In this study, the effect of short heat stress (42 °C, 30 min) on indica rice plants at the grain-filling stage (dough grain stage) was found by determining their physiological and growth traits Fv/Fm, ∆F/Fm′, chlorophyll content, leaf water potential (LWP), membrane stability, relative leaf area (RLA), relative plant height (RPH), total grain weight per panicle (TGW) and 1000 GW. Thai economic rice cvs. KDML105 and Pathumthani 1 (PTT1) were compared to the heat-tolerant rice cultivars N22 and Dular and to the heat-sensitive rice cultivar IR64. The results showed that short heat stress exhibited effects on physiology and growth greater than the control (35 °C, 30 min) by reducing of Fv/Fm, ∆F/Fm′, chlorophyll content, LWP, membrane stability and RLA. This result impacted the TGW and 1000 GW. A higher reduction of physiological traits was shown in IR64, followed by KDML105. In contrast, N22 and Dular were minimally affected by heat stress and were able to adapt and recover based on their grain weight that exhibited less of an effect. PTT1 was also impacted by heat stress similarly to Dular. Thus, short heat stress affected the physiological parameters of five rice cultivars at the dough grain stage. In addition, the five indica rice cultivars were classified into three groups: (1) the heat-tolerant group (N22, Dular and PTT1), (2) the moderately heat-tolerant group (KDML105), and (3) the heat-sensitive group (IR64) by PC-ORD program at 50% of similarity of the 13 physiological traits.


Rice Heat stress Photosynthesis Chlorophyll content Heat tolerance 




Chl a

Chlorophyll a

Chl b

Chlorophyll b


Days after heat treatment


Electrical conductivity


Electrolyte leakage


Minimal fluorescence in the dark-adapted state


Maximal fluorescence in the dark-adapted state


Steady state fluorescence under a natural irradiation


Maximal fluorescence in the light-adapted state


Maximum quantum yield of PSII efficiency


Quantum yield of PSII efficiency


Khao Dawk Mali 105


Leaf water potential




Mega pascal


Photosynthetically active radiation


Relative leaf area


Relative plant height


Pathumthani 1


High temperature


Total chlorophyll content


Total grain weight per panicle

1000 GW

1000 grain weight



This research was funded by the Government of Thailand’s Grants to Khon Kaen University (KKU) (Project code: 592505), Research Fund for Supporting Lecturer to Admit High Potential Student to Study and Research on His Expert Program from Graduate School, KKU Research Fund (Fiscal year 2007) and Salt-tolerant Rice Research Group, KKU, Thailand. Scientific instruments were supported by Faculty of Agriculture and Department of Biochemistry, Faculty of Science, KKU, Thailand. In addition, the rice seed source was provided by Biotechnology research and development office Thailand, Pathum Thani rice research center Thailand, IRRI Philippines and Assist. Prof. Dr. Jirawat Sanitchon.


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Copyright information

© Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Kraków 2018

Authors and Affiliations

  1. 1.Department of Biochemistry, Faculty of ScienceKhon Kaen UniversityKhon KaenThailand
  2. 2.Department of Biology, Faculty of ScienceKhon Kaen UniversityKhon KaenThailand
  3. 3.Department of Agronomy, Faculty of AgricultureKhon Kaen UniversityKhon KaenThailand
  4. 4.Salt-tolerant Rice Research Group, Department of Biology Faculty of ScienceKhon Kaen UniversityKhon KaenThailand

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