Effects of Low Phosphorus Stress on Growths and Physiological Characteristics of Saraca dives Seedlings
To explore tolerance of Saraca dives seedlings to low phosphorus environment and provide references for seedling cultivation and promotion, taking one-year-old S. dives seedlings as experimental materials, effects of normal phosphorus (control, 1.00 mmol/L) and low phosphorus treatments (0.70, 0.40, 0.20, 0.10, 0.05 and 0 mmol/L) on growths and physiological characteristics of S. dives seedlings were studied by sand culture method. Results showed that with increase of low phosphorus stress, plant height increment, ground diameter increment, leaf area, leaf length and soluble protein content of S. dives seedlings decreased, and leaf width, activities of per-oxidase (POD) and superoxide dismutase (SOD) as well as malondialdehyde (MDA) content increased firstly and then decreased. S. dives seedlings exhibited a certain tolerance to mild and moderate low phosphorus stress (≥0.20 mmol/L).
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