Saturday, 15 July 2006

Physiological Adaptability of Seeding Tomato Cutivars Under Low Phosphorus Stress.

Han Xiaori, Wang Jing, Zhan Xiumei, Gong Liang, Yu Chengguang, and Yin Hongbin. College of Land and Environment Science, Shenyang Agricultural Univ, Dongling Rd 120, Shenyang, 110161, China

The mechanisms of morphological and physiological plasticity of root system of seeding tomato cutivars under low-phosphrus stress were studied with solution culture. Results showed that low-phosphorus stress restricted shoot growth, but stimulated root growth. The different phosphorus efficiency of low-phosphorus-tolerant cultivars attributed to phosphorus uptake ability not the different distribution of phosphorus and utilization ability. The average length of lateral roots of low-phosphorus-tolerant tomato cultivars was longer than that of low-phosphorus-sensitive tomato cultivars under low- phosphorus stress, but the average number of lateral roots did not differ significantly among different tomato cultivars. The acid phosphatase activity of different cultivars rose significantly in low- phosphorus stress. In the normal phosphorus treatment, acid phosphatase activity of root was the lowest, but the increment range of acid phosphatase activity of low-phosphorus-tolerant tomato cultivars was higher than that of low-phosphorus-sensitive tomato cultivars under low- phosphorus stress. Low Km and Cmin were characterized by low-phosphorus-tolerant tomato cultivar under low- phosphorus stress. Key words: tomato; phosphate stress; acid phosphatase; root/shoot ration.

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