Reasearch On Effects Of Growth And Physiological Changes Induced By Waterlogging In Non-Heading Chinese Cabbage (Brassica Campestris L. Ssp. Chinensis Makino)

Non-heading Chinese cabbage (Brassica campestris L. ssp. chinensis Makino) is the main vegetable in the middle-lower the Yangtze River and its south area, the problem of humidity from rainfall and protection in the spring and summer affect the production of non-heading Chinese cabbage seriously. Screening and identification of waterlogging tolerant genotypes to development Waterlogging tolerance cultivars has an important significance in the non-heading Chinese cabbage industry.From crop research, the more are in Gramineae, Solanaceae, Leguminosae and Asteraceae, has made some progress.But the research of waterlogging stress in non-heading Chinese cabbage is the initial stage still. Especially the identification is not yet involved in the non-heading Chinese cabbage and the continuous physiological reaction differences of different waterlogging tolerant genotype non-heading chinese cabbage has rarely been reported. This research investigates the effects of waterlogging on their growth from both morphological and physiological indicators by simulating waterlogging stress conditions. This research intends to provide a scientific basis for breeding and production.We used 6 different non-heading Chinese cabbages genotypes as materials, studied the effects of waterlogging on their growth from both morphological and physiological indicators by substrate cultivation, soilless cultivation, and hydroponic conditions. The results showed that indicators between waterlogging treatment and control are irregularly by substrate cultivation and soilless cultivation. There are regular differences between waterlogging treatment and control by hydroponic conditions which is more conducive to simulate waterlogging stress conditionsSix varieties to investigate the effects of waterlogging on their growth from both morphological and physiological indicators by hydroponic roots humidity conditions. The results showed that morphological indicators such as the height, leaf length, fresh weight, dry weight were significantly affected by the waterlogging treatment, among which the most sensitive was the fresh weight. Waterlogging also has an important impact on physiological indicators such as chlorophyll, soluble protein, soluble sugar, MDA, proline and relative water content (RWC). Moreover, the RWC was significantly increased while the chlorophyll and protein content decreased indicated that waterlogging had effects on the synthesis of chlorophyll and protein. Summing up all the changes of morphological and physiological, two materials ’Aijiaosuzhouqing’ and ’Heiyoutong’ were affected at lowest level by waterlogging than other materials, indicating that both of them had relatively strong waterlogging tolerance, whereas ’Juhuaxin’ was affected at the highest level, indicating a poor waterlogging tolerance.