Effects on night temperature treatments on the panicle initiation and the final leaf number of sorghum (Sorghum bicolor Moench) inbred strain 932233B
2001
Uozumi, S. (National Grassland Research Inst., Nishinasuno, Tochigi (Japan)) | Kurokawa, S. | Yoshimura, Y.
As part of a study on the heading characteristics of sorghum, the effects of time and duration of the night temperature treatments on the time to panicle initiation and the final leaf number were examined. Thermo-sensitive inbred strain 932233B were grown in pots under controlled climatic conditions both in low night temperature (LT : 15 deg C) and high night temperature (HT : 30 deg C). Plants were transferred from LT to HT or from HT to LT with several combinations of the time and duration of treatment. LT induced panicle initiation and reduced final leaf number and HT restrained panicle initiation and increased final leaf number. However, the degree of the response varied substantially among different treatments. It was suggested that the sensitivity to low temperature was acquired immediately after sowing and the sensitivity to high temperature was acquired at 3-4 leaves stage by the analysis of the above-mentioned response. The minimum LT duration required to induce the panicle differentiation (MLT) decreased with growth until 8 leaves stage, and MLT in number of emerged leaves was negatively correlated with the growth stage in leaf number at the onset of the low night temperature treatment. There were, however, no relationship between MLT and growth stage after 8 leaves stage.
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