Annals of Botany 77: 215-221, 1996
© 1996 Annals of Botany Company
The Effect of Temperature on Leaf Appearance in Rice
Agronomy, Plant Physiology and Agroecology Division, International Rice Research Institute (IRRI), P.O. Box 933, Manila, 1099, Philippines Department of Theoretical Production Ecology, Wageningen Agricultural University (TPE-WAU), P.O. Box 430, AK Wageningen, 6700, The Netherlands DLO-Research Institute for Agrobiology and Soil Fertility (AB-DLO), P.O. Box 14, AA Wageningen, 6700, The Netherlands
May 9, 1995 ; September 29, 1995
Temperature is the principal environmental determinant of crop leaf appearance. The objective of this study is to analyse whether there are different effects of day temperature (TD) and night temperature (TN) on main-stem leaf appearance in rice (Oryza sativaL.).
Plants of 12 rice cultivars were grown at five constant temperatures (22, 24, 26, 28 and 32 °C) and four diurnally fluctuating temperatures (TD/TN: 26 /22, 30 /22, 22 /26 and 22 /30 °C) with a constant photoperiod of 12hd-1. The leaf appearance on the main stem was measured.
A constant change in leaf appearance rate was observed during ontogeny. The relation between the number of emerged leaves and days from seedling emergence was described by a power-law equation with only one cultivar-specific parameter. Values for this parameter were estimated for the five constant temperature treatments, and the relation between this parameter and temperature was quantified by a nonlinear model. Leaf appearance for the four fluctuating temperature treatments could be accurately predicted on the basis of these relations in each cultivar. This indicated that there were no specific effects ofTDandTNon leaf appearance in rice, in contrast with phenological development to flowering. The optimum temperature for leaf development was found to be substantially higher than for development to flowering.
The final main-stem leaf number differed with diurnal temperature conditions. When a diurnal temperature delayed flowering, it increased the leaf number as well. This might explain whyTDandTNhad a different effect on development to flowering but not on leaf development.
Oryza sativa; rice; leaf appearance; leaf number; day and night temperature
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