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Interpreting Cultivar x Environment Interactions for Yield in Upland Rice

Assigning Value to Drought-Adaptive Traits

H. R. Lafitte*,a and B. Courtoisb

a IRRI, DAPO 7777, Metro Manila, The Philippines
b CIRAD-Biotrop TA40/03 Avenue Agropolis 34398 Montpellier Cdex 5, France



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Fig. 1. Biplot of the first two ordination scores for standardized grain yield for diverse rice cultivars in nine managed environments. The environment vectors are labeled as in Table 1. The codes for cultivars are from Table 2. PCA = principal component axis.

 


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Fig. 2. Biplot of the first two ordination scores for standardized number of spikelets per panicle (SPP) for diverse rice cultivars in six managed environments. The environment vectors are labeled as in Table 1. The codes for cultivars are from Table 2. PCA = principal component axis. Group S1, comprising Cultivars 7, 17, 25, 36, 44, and 48, clusters at the origin and has been omitted.

 


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Fig. 3. Biplot of the first two ordination scores for standardized fraction of fertile spikelets for diverse rice cultivars in six managed environments. The environment vectors are labeled as in Table 1. The codes for cultivars are from Table 2. PCA = principal component axis.

 


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Fig. 4. Biplot of the first two ordination scores for standardized thousand-grain weight (TGW) for diverse rice cultivars in eight managed environments. The environment vectors are labeled as in Table 1. The codes for cultivars are from Table 2. PCA = principal component axis.

 





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