Fig. 3. Relationship between growth related traits in ample water versus restricted water. The relationships were fitted with type II regression. When these relationships were significantly different from zero are plotted as the solid black lines. For reference, 1:1 line is shown (dotted line).
What is the relationship between performance and tolerance under restricted-water conditions and the wetness index of locations?
There was a significantly (p = 0.03, R2 = 0.06) negative relationship between RGRA of genotypes in restricted-water conditions and the wetness index of the climate of a genotype’s origin (Fig. 4 A), illustrating that genotypes from relatively wet areas (high wetness index) tended to have lower RGRA in the restricted-water treatment than those from drier locations. Performance of a genotype in restricted-water conditions could partially be predicted from the wetness index of its geographic location by the following formula: RGRArestricted-water (d-1) = 0.014 - 0.002 (wetness index), S.E = 0.001, R2 = 0.06, F (1, 80) = 4.85, p = 0.03). The fitted slope (-0.002) has a confidence interval of (-0.0040, -0.0002) at 95.5 % implying that performance under restricted-water conditions is negatively correlated with WI.