Figure 14.12 The ratio of root mass to shoot mass can change markedly with temperature and this ratio commonly decreases with increasing temperature, illustrated here by an Australian native glycine (Glycine clandestina). Cultivated soybean (G. Max) on the other hand shows little change in root:shoot ratio with temperature. A high root:shoot ratio at low temperature should not be interpreted to mean that the roots of G. clandestina have low optimum temperature for growth without additional sources of evidence. Moreover, root and shoot temperatures are likely to be significantly different under field conditions. (Based on Kokubun and Wardlaw 1988)