Response of rice to changing climatic condition: (I) Genotypic variation in growth response to elevated temperature

Pasuquin Estela Magbujos, Reinke Russell F., Lafarge Tanguy, Eberbach Philip, Hasegawa Toshihiro, Wade Len. 2009. Response of rice to changing climatic condition: (I) Genotypic variation in growth response to elevated temperature. In : Crop production under heat stress : monitoring, impact assessment and adaptation. Proceedings of the MARCO Symposium, Tsukuba, Japan, 5-9 October 2009. Hasegawa Toshihiro (ed.), Sakai Hidemitsu (ed.). NIAES. Tsukuba : NIAES, Résumé, 84. Marco Symposium "Challenges for Agro-Environmental Research in Monsoon Asia". 1, Tsukuba, Japon, 5 Octobre 2009/9 Octobre 2009.

Résumé : The predicted increases in global atmospheric temperatures are likely threats to rice productivity. In order to help develop better genotypes and crop management strategies to sustain the continuously increasing demand for rice, deeper understanding of the growth and physiological responses under increased temperature and other related climatic conditions is needed. This study aims to evaluate the response of 18 rice genotypes from Japonica, Tropical Japonica, Indica, Aus/Japonica and Glaberima/Japonica germplasm group with a wide range of high temperature response. Seeds were direct-sown and grown in pots under continuous day/night temperatures of 25°C, 28°C, 31°C and 34°C under naturally-lit chambers in Yanco (11.5 MJ m-2 dI) and in artificially-lit chambers in Wagga Wagga (7.8 MJ m2-ld-\ New South Wales, Australia .. Growth was poor (6.9 g/pl) at Wagga Wagga under artificial light at all temperatures, so those results were not considered further. In contrast, individual plant dry weight at 72 DAS at Yanco decreased from 27.1 g/pl at 25°C to 14.66 g/pl at 34°C under natural light (11.5 MJ m2-l dI). Vandana had high, Takanari had intermediate and Akihikari had low dry weight at all temperatures. Contrary to expectation, N22 had reduced dry weight at high temperature while IR 72 and especially IR64 retained or even increased dry weight at high temperature. The response of the individual genotypes to climatic conditions inside the growth rooms was quite wide, but discrimination between the climatic factors and their effect on plant growth could not be achieved in the facilities exploited here. A more intensive characterization of the responses in well controlled environments is needed to better identify and discriminate the mechanisms for adaptation to elevated temperature. (Texte intégral)

Classification Agris : F62 - Physiologie végétale - Croissance et développement
F30 - Génétique et amélioration des plantes
P40 - Météorologie et climatologie

Auteurs et affiliations

• Pasuquin Estela Magbujos, IRRI [International Rice Research Institute] (PHL)
• Reinke Russell F., Yanco Agricultural Institute (AUS)
• Lafarge Tanguy, CIRAD-BIOS-UPR AIVA (PHL)
• Eberbach Philip, Charles Sturt University (AUS)
• Hasegawa Toshihiro, National Institute of Agro-Environmental Sciences (JPN)
• Wade Len, Charles Sturt University (AUS)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/556002/)

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