Study on proline accumulation patterns of six plantspecies under adversity stress

The accumulation and variation patterns of free proline in 6 plant species (Potentilla fragarioides, Leontopodium nanum, Kobresia humilis, Oxytropis kansuensis, Stellera chamaejasme and Potentilla fruticosa) distributed in subalpine meadow of Gannan were studied at different environmental gradients. The results indicated that along with the change of environment (including soil water, temperature and sunlight) from the shade slope to sunlight slope, the concentration of free proline in leaf of 6 species increased in certain degree. The increasing range of free proline concentration among different species was different. The contents of praline could be used as an indicator for the resistance of plant.