Seedling growth and nutrient absorption of sweet potato affected by exogenous chlorine

2014

A:PS

Taking the seedlings of sweet potatoes Xushu22, Sushu11 and Ningzi1 as test materials, their nutrient absorption and plant growth under exogenous chlorine treatments (0 mmol/ L, 42.2 mmol/ L, 84.4 mmol/ L, 168.8 mmol/ L, 211.0 mmol/ L) for 7 d and 21 d were investigated, by measuring plant fresh weight, chlorophyll content index (CCI), malondialdehyde (MDA) content, nitrate reductase (NR) activity, NO-3 content, and contents and accumulations of N, P and K. The results showed that the biomass and NPK-accumulations of Xushu22 declined by exogenous chlorine, however, they were maintained at certain levels. Lower concentrations of chlorine treatment(=< 84.4 mmol/ L) improved the growths of Sushu11 and Ningzi1. The CCI of 3 genotypes of sweet potato increased by exogenous chlorine with concentrations ranging from 42.2 to 168.8 mmol/ L compared to the control. MDA levels were improved by chlorine. Twenty-one days of lower concentrations (=< 84.4 mmol/ L) of chlorine increased total nitrogen content by increasing NR activity and NO-3 content of sweet potato seedlings. These results indicate that chloride stress tolerance is genotype-dependent in sweet potato, and shortterm and low-concentration exogenous chloride treatment is conducive to the growth of sweet potato seedlings.

30(1):80-86, JIANGSU JOURNAL OF AGRICULTURAL SCIENCES

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