Cardinal Temperatures and Thermal Time for Germination of Sarawak Traditional Rice

• Main Authors: Franalyne Lyenang, Luing, Hollena, Nori
• Format: Article
• Language: English
• Published: Malaysian Society of Applied Biology 2023
• Subjects: S Agriculture (General)
• Online Access: http://ir.unimas.my/id/eprint/43852/4/Cardinal.pdf; http://ir.unimas.my/id/eprint/43852/; https://jms.mabjournal.com/index.php/mab/about; https://doi.org/10.55230/mabjournal.v52i5.2630
• Institution: Universiti Malaysia Sarawak

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.