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Developing Perennial Upland Rice I

Field Performance of Oryza sativa/O. rufipogon F1, F4, and BC1F4 Progeny

Erik J. Sacks*,a, Jose P. Roxasb and Maria Teresa Sta. Cruzb

a HortResearch, Private Bag 3123, Hamilton, New Zealand
b Plant Breeding Genetics & Biochemistry Division, International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines



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  		Fig. 1. Daily values for natural rainfall and evaporation at IRRI's upland farm during this experiment. Arrows indicate dates that supplemental sprinkler irrigation was used to saturate the soil.

 


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  		Fig. 2. O. sativa/O. rufipogon F1 families grown under upland conditions at IRRI, Los Banos, Philippines. Planted July 1999. Cards with plot numbers measured 76 mm x 127 mm. (A) Plants in the center plot (20554 = WAB56-50/106340-1) segregated for plant height and openness, indicating that the O. rufipogon parent was heterozygous at some loci. Note the short, open plant in the foreground and the tall, upright plant in the background. Photographed October 2000. (B) Plants of Azucena/106144-18 (plot 20478) remained vigorous throughout the dry season, even when the surface of the soil was dry and cracked. Photographed May 2000.

 




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