Growth - nodulation and nitrogen-fixation in soybean (Glycine max. (L.) Merr.) plants exposed to after-flowering waterlogging and water stress [Friuli-Venezia Giulia]
1993
Miceli, F. | Marchiol, L. | Zerbi, G. (Udine Univ. (Italy). Istituto di Produzione Vegetale)
A pot experiment was carried out with the aim to study the growth and the nitrogen uptake in soybean plants (cv. Westfield - MGI) subjected to a prolonged waterlogging period during the seed development and filling stages. A well watered control and a water stressed treatment were also included. A non-modulating line (L65-1274) was exposed to the same treatment in order to obtain the amount of fixed N, calculated via the difference method. The waterlogged plants differentiated new roots and nodules and, after a lag phase of reduced photosynthesis and growth, a marked recover in the biomass and N accumulation was evidenced. At the end of growth cycle, the total biomass of waterlogged plants and of controls was similar, while the seed production was lower, due to a reduced number of seeds not compensated by the increased unit weight. In well-watered plants a constantly high symbiotic N fraction was observed, while in waterlogged plants a substantial restoration of the nitrogen fixation capability occurred after the treatment was over, but the late-fixed N was scarcely translocated to the seeds
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