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In future climates, greater heat tolerance at anthesis will be required in …

Biology Articles » Bioclimatology » High temperature stress and spikelet fertility in rice (Oryza sativa L.) » Tables

Tables
- High temperature stress and spikelet fertility in rice (Oryza sativa L.)


Table 1. Total number of assessed spikelets, and the percentage that reached anthesis during the 1, 2, 4, or 6 h temperature treatments, in IR64 and Azucena in experiments 1 and 2

Temperature (°C) Temperature treatment duration
1 h
 2 h
 4 h
 6 h
No. % No. % No. % No. %
Experiment 1: IR64
29.6 – – 265 83 – – – –
33.7 – – 282 72 – – – –
36.2 – – 320 71 – – – –
Experiment 1: Azucena
29.6 – – 140 57 – – – –
33.7 – – 151 52 – – – –
36.2 – – 73 70 – – – –
Experiment 2: IR64
29.6 340 11 261 50 362 94 357 97
33.7 327 28 329 56 327 100 344 97
36.2 311 23 298 64 294 97 351 100
Experiment 2: Azucena
29.6 194 40 261 46 222 93 186 100
33.7 340 43 370 34 252 97 298 100
36.2 336 26 377 37 245 98 281 100



Table 2. The total number of anthesing spikelets per day, averaged over the first 3 d of flowering, in IR64 and Azucena subjected to day temperatures of 29.6 °C and 36.2 °C; SED: genotype 5.68**; genotypextemperature 8.03*

Temperature (°C) IR64
 Azucena
Day No. spikelets nearing anthesis Day No. spikelets nearing anthesis
29.6 1 46 1 37
2 47 2 51
3 56 3 45
Mean 49.7 44.3
36.2 1 38 1 34
2 60 2 30
3 80 3 21
Mean 59.3 28.3
Genotype mean 54.5 36.3



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