Effect of Water-logging Stress and Nitrogen Forms on Amount and Solutes Concentration of Bleeding Sap in Maize Plants at Seeding Stage

doi:10.3969/j.issn.1000-7091.2013.03.024

Abstract

Abstract: Effect of water conditions( water-logging stress and non-water-logging stress) and nitrogen forms( ammonium，nitrate and the mixture of nitrate and ammonium) on concentration and transport of components in bleeding sap of maize( Zea mays L． ) plants at seeding stage was carried out by using sand culture experiment． The result showed that，dry weight of root， stem and sheath and total biomass of maize plants increased significantly，when compared with the control under three days of water-logging stress condition． So did the leaves from that time on． As a result，water-logging stress treatment and ammonium supply facilitated all of the roots， stem and sheath and leaves growth of maize plants when compared with nitrate． Furthermore，dry weight of stem and sheath of ammonium-fed plants was significantly higher than that of the mixed nitrogen forms-fed plants． Three days of water-logging stress obviously reduced the amount of bleeding sap and the soluble sugar translocation( exudation weight × concentration) in it． However， seven days of water-logging stressed maize plants supplied with ammonium did not exhibit any negative effect on soluble sugar and free amino acid translocation in the bleeding sap and showed the highest root activity．In contrast，water-logging stress significantly reduced the amount of bleeding sap at night and nitrate translocation to the shoot，and increased the root activity of nitrate-fed plants． The amount of soluble sugar in bleeding sap of nitratefed plants gradually reduced along with the increase of stress time，whereas，both of the trend of the reduction in the amount of free amino acid in bleeding sap at night and the increase in root activity of nitrate-fed plants disappeared at the same time． Therefore， it revealed that nitrogen form is a major factor affecting maize plants to adapt to water-logging stress，with the periodic difference existed in the responses of different nitrogen form-fed maize plants to the stress condition

Key words: Water-logging stress, Nitrogen form, Maize, Bleeding sap

CLC Number:

Liu Panpan, Wu Dali1, Liu Chang, Zhou Yi1, Wang Jianfei. Effect of Water-logging Stress and Nitrogen Forms on Amount and Solutes Concentration of Bleeding Sap in Maize Plants at Seeding Stage[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2013, 28(3): 133-138. doi: 10.3969/j.issn.1000-7091.2013.03.024.

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