Cardinal Temperatures and Thermal Time for Germination of Sarawak Traditional Rice


  • Franalyne Lyenang Luing Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, Malaysia
  • Hollena Nori Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, Malaysia


Development, Growing degree days, Linear model, Oryza sativa, Paddy


Germination of two rice landraces, namely Bario Sederhana and Biris, was determined from twelve temperatures (12.5 – 40 ºC) in a series of incubation experiments. The cardinal temperatures and thermal time for germination were estimated from a ‘broken-stick’ linear model. Both landraces had a Tb of 10 ºC, Topt between 32 – 33 ºC, and Tmax of 43 ºC. At the sub-optimal temperatures, the thermal time for germination was 62 ºCd for Bario Sederhana and 53 ºCd for Biris. Within the supra-optimal range (Topt to Tmax), both landraces required 27-29 ºCd for seed germination. The maximum final germination for Bario Sederhana was 93% at 30 ºC while Biris had 100% seeds population germinated at 27.5 ºC.


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How to Cite

Luing, F. L., & Nori, H. (2023). Cardinal Temperatures and Thermal Time for Germination of Sarawak Traditional Rice. Malaysian Applied Biology, 52(6), 101–109.



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