NITROGEN PARTITIONING AND NET PHOTOSYNTHESIS IN SOYBEAN GENOTYPES DIFFERING IN SEED FILLING DURATION AND N SOURCE

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概要

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• Four soybean cultivars differing in the duration of the seed filling period (SFP) were evaluated in the field for N and dry weight accumulation, N_2-fixation and net leaf photosynthetic CO_2 exchange rates (CER). N_2-fixation was measured by isotope dilution, using a non-nodulating (non-nod) near-isogenic line of the cultivar Harosoy as a control. There were consistent differences between the non-nod and its sister cultivar for seed yield, N accumulation and N redistribution, but both genotypes had the same SFP duration and final shoot biomass. Reduced N accumulation in the non-nod resulted in less dry weight partitioned to seeds but no reduction in the length of the SFP. Cultivars with long SFP's had greater yield, more N and dry weight accumulation between the beginning of seed fill and maturity, and a slower decline in leaf CER during seed fill, compared to short SFP cultivars. However cultivars varied with respect to vegetative dry weight, N accumulation, N redistribution, the proportion of total N allocated to seeds, and the peak CER, independent of differences in SFP. Neither the amounts of accumulated N or fixed N_2 explained differences in the SFP.

• 九州大学の論文

著者

• Hesketh J.

  Photosynthesis Research Unit Agricultural Research Service United States Department Of Agriculture A

• Hesketh J.

  Photosynthesis Research Unit Usda-ars And Agronomy Department University Of Illinois

• GUFFY R.

  Agronomy Department, Iowa State University

• VASILAS B.

  Department of Plant Science, University of Delaware

• Guffy R.

  Agronomy Department Iowa State University

• Vasilas B.

  Department Of Plant Science University Of Delaware

関連論文

• STOMATAL AND NONSTOMATAL ACCLIMATION TO A CO_2-ENRICHED ATMOSPHERE
• WATER, NITROGEN AND WEED STRESS IN FIELD CORN (ZEA MAYS L.) : SHOOT GROWTH AND DEVELOPMENT
• SEPARATING PHOTOPERIOD AND TEMPERATURE EFFECTS ON THE DEGREE DAY REQUIREMENT FOR FLORAL EVENTS IN SOYBEAN
• NITROGEN PARTITIONING AND NET PHOTOSYNTHESIS IN SOYBEAN GENOTYPES DIFFERING IN SEED FILLING DURATION AND N SOURCE

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