1. Alia, Saradhi PP (1991) Proline accumulation under heavy metal stress. J Plant Physiol 138: 504–508
2. Aloni R (1987) Differentiation of vascular tissues. Annu Rev Plant Physiol 38: 179–204
3. Angelov T, Uzunova A, Gaidardjieva K (1993) Cue+ effect upon photosynthesis, chloroplast structure, RNA and protein synthesis of pea plants. Photosythetica 28: 341–350
4. Armstrong JK, Huenneke LF (1992) Spatial and temporal variation in species composition in California grasslands: the interaction of drought and substratum. In: Baker AJM, Proctor J, Reeves RD (eds) The vegetation of ultramafic (serpentine) soils, Intercept, Andover, Hampshire, pp. 213–233
5. Baker AJM, Dalby DH (1980) Morphological variation between some isolated populations of Silene maritima With. in the British Isles with particular reference to inland populations on-metalliferous soils. New Phytol 84: 123–138