1. Agarwal RK, Gupta SC (1995) Plant growth substances as osmoregulants under salt stress in callus cultures of cowpea. Indian J Plant Physiol 4:325–327
2. Al-Khayri JM, Al-Bahrany AM (2002) Callus growth and proline accumulation in response to sorbitol and sucrose-induced osmotic stress in rice. Biol Plant 45:609–611
3. Al-Khayri JM (2002) Growth, proline accumulation, and ion content in sodium chloride-stressed callus of date palm. In Vitro Cell Develop. Biol Plant 38:79–82
4. Almansouri M, Kinet JM, Lutts S (2000) Physiological analysis of salinity resistance in Triticum turgidum var. durum Desf.: Callus versus whole plant responses. Options Mediterraneennes Ser A Seminaires Mediterraneens 40:263–265
5. Ashraf M, Foolad MR (2007) Roles of glycine betaine and proline in improving plant abiotic stress resistance. Env Exp Bot 59:206–216