Changes of Leaf Nitrogen and Petiole Ureide Content in Soybean [Glycine max (L.) Merrill] under Waterlogging Condition
2011
Lee, J.E., National Institute of Crop Science, RDA, Suwon, Republic of Korea | Kim, H.S., Chungbuk National University, Cheongju, Republic of Korea | Kwon, Y.U., National Institute of Crop Science, RDA, Suwon, Republic of Korea | Jung, G.H., National Institute of Crop Science, RDA, Suwon, Republic of Korea | Kim, S.L., National Institute of Crop Science, RDA, Suwon, Republic of Korea
Soybean is the most promising crop for substituting rice on the paddy field. Excessive water stress is a common limiting factor in soybean yield under paddy soil condition. This study was carried out to identify changes in leaf total nitrogen and petiole ureide content under excess water conditions for establishing a screening system related to waterlogging tolerance. Waterlogging treatment was conducted by maintaining the water level on the soil surface for 10 days at the early vegetative growth stage (V∧5) and the flowering stage (R₂). Leaf total nitrogen content, SPAD value and ureide content in petiole decreased in all soybean varieties in response to waterlogging, but the degree of decrease was much lesser in Pungsannamulkong and Muhankong than in Jangyeobkong and Myungjunamulkong, at 21 days after waterlogging treatment. This result means that root and nodule recovery rates were much higher in Pungsannamulkong and Muhankong than in Jangyeobkong and Myungjunamulkong after waterlogging treatment. The ureide and leaf nitrogen content showed high positive correlation with SPAD value, regardless of waterlogged stages. In conclusion, leaf nitrogen content, ureide content in petiole and leaf greenness were identified as promising indicator for screening soybeans which are tolerant of excess water.
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