首页|Atmospheric NH_3 as plant nutrient: A case study with Brassica oleracea
Atmospheric NH_3 as plant nutrient: A case study with Brassica oleracea
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Nutrient-sufficient and nitrate- or sulfate-deprived plants of Brassica oleracea L. were exposed to 4 μl 1~(-1) NH_3 (2.8 mg m~(-3)), and effects on biomass production and allocation, N-compounds and root morphology investigated. Nitrate-deprived plants were able to transfer to atmospheric NH_3 as nitrogen source, but biomass allocation in favor of the root was not changed by exposure to NH_3. NH_3 reduced the difference in total root length between nitrate-sufficient and nitrate-deprived plants, and increased the specific root length in the latter. The internal N status, therefore, might be involved in controlling root length in B. oleracea. Root surface area, volume and diameter were unaffected by both nitrate deprivation and NH_3 exposure. In sulfate-deprived plants an inhibitory effect of NH_3 on root morphological parameters was observed. These plants, therefore, might be more susceptible to atmospheric NH_3 than nitrate-deprived plants. The relevance of the present data under field conditions is discussed.
biomass allocationnutrient deprivationnutrient foragingshoot to root signalingroot morphology
Ana Castro、Ineke Stolen、Luit J. De Kok
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Laboratory of Plant Physiology, University of Groningen, P.O. Box 14, 9750 AA Haren, The Netherlands
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