التفاصيل البيبلوغرافية
| العنوان: |
Iron deficiency-induced changes in carbon fixation and leaf elemental composition of sugar beet (Beta vulgaris) plants. |
| المؤلفون: |
Rombolà, A. D., Gogorcena, Y., Larbi, A., Morales, F., Baldi, E., Marangoni, B., Tagliavini, M., AbadÍa, J. |
| المصدر: |
Plant & Soil; Apr2005, Vol. 271 Issue 1/2, p39-45, 7p |
| مصطلحات موضوعية: |
SUGAR beets, SUGAR crops, REJUVENESCENCE (Botany), PLANT growth-promoting rhizobacteria, GASES from plants, PLANT photorespiration, EFFECT of light on plants |
| مستخلص: |
In this experiment we (i) tested the hypothesis that, besides decreasing leaf C fixation, lime induced iron (Fe) deficiency increases root C fixation via PEP carboxylase and (ii) assessed the Fe-induced modifications in the elemental composition of plant tissues. Sugar beet plants were grown in nutrient solutions with Fe (45µM Fe-EDTA; +Fe control) or in a similar nutrient solution without Fe (-Fe) and in presence of CaCO3 (1.0 gL-1), either labelled with13C (20 at. %) or unlabelled. After 7 and 17 days from treatment imposition, plants were harvested and single organs analysed for total O, C, H, macro and micronutrients.13C abundance was also assessed in control, unlabelled and labelled -Fe plants. Iron deficiency caused significant growth reductions; chlorophyll and net photosynthesis decreased markedly in Fe-deficient plants when compared to the controls, whereas leaf transpiration rates and stomatal conductance were not affected by Fe deficiency. Iron deficient plants had leaf biomass with lower C (2 to 4%) and higher O (3 to 5%) concentrations than +Fe plants. The d13C was higher (less negative) in +Fe than in -Fe unlabelled plants. Iron deficient plants grown in the nutrient solution enriched with labelled CaCO3 absorbed a relatively small amount of labelled C, which was mainly recovered in the fine roots and accounted for less than 2% of total C gain in the 10 d treatment period. Evidences suggest that iron deficient sugar beets grown in the presence of CaCO3 do not markedly shift their C fixation from leaf RuBP to root PEPC. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
