Rate of plant development and endosperm texture inTRITICUM DURUMdesf. —The relationships between the rate of development of the plants obtained from kernels with hard or with porous endosperms have been examined. The devernalisation of the hard kernels obtained placing the kernels during 10 days at 25[ddot]C in moist air converts a hard endosperm into a porous one and the plants which grow afterwards have a lower rate of development than the controls.