ISHS Acta Horticulturae 467: III International Symposium Diversification of Vegetable Crops
GENETIC DIVERSITY OF NITRATE ACCUMULATION IN VEGETABLE CROPS |
| Authors: | Z. Weimin, L. Shijun, G. Lihong, C. Laibing, Z. Suping, H. Zhongyang, Z. Dabiao |
| Keywords: | Diversity, Nitrate Accumulation, Vegetable Crops |
| Abstract:
Twenty vegetable crops, including 29 pak-choi cultivars, 14 stem lettuce cultivars, 5 inbred lines of spring/summer radish and their F1's from different ecological areas in China were tested for NC(nitrate content). Testing was done at the Nanjing Non-pollution Vegetable Production Station and Nanjing Agricultural University using the deep floating technique(DFT) with Hoagland I solution. NC was determined by the NO3 electrode and three other methods. Wide genetic variation exists between different vegetable types and cultivars of the same vegetable. The results indicated that some vegetables, such as stem lettuce, radish, celery and pak-choi accumulated a relatively high nitrate, while leguminous vegetables and melon or other fruit vegetables contained less. The difference between types and cultivars was not affected when planted in different areas. Furthermore, the difference of NC among pak-choi cultivars did not change with growing seasons, but the difference between cultivars became smaller as the content of solution NO3- increased. Therefore, cultivars screening should be carried out by use of a relatively low NO3- medium. Two pak-choi cultivars, JY-1 and MT-1 and three endemic stem lettuce cultivars with low NC were selected, 5 radish inbreds were different in NC and NC of their F1's was either higher or lower than the parents. Nitrate determination by NO3- electrode proved accurate and convenient compared with other methods. The mechanism of nitrate accumulation and some practical methods to reduce it in vegetable crops were discussed. | |
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