The modular character of growth in Nicotiana tabacum plants under steady-state nutrition |
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Authors: | Walter A; Schurr U |
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Institution: | Department of Botany, University of Heidelberg, Im Neuenheimer Feld 360, D069120 Heidelberg, Germany; Corresponding author e-mail: uschurr@botanik1.bot.uni-heidelberg.de |
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Abstract: | The impact of different plant growth rates on biomass allocation and growth
distribution in tobacco was studied on the whole plant, total leaf area and
single leaf level. On the whole plant level, constant relationships were
found between the total leaf area and the biomass allocation to leaves and
the nonphotosynthetic organs (roots and stem) independent from the overall
growth rate and the nutrient addition rate to the plants. On the level of
total leaf area, plants grown at lower nutrient supply reached a distinct
distribution of leaf area later than those grown at higher nutrient supply,
but the normalized distribution of leaf area along the stem at a certain
plant size did not differ between plants growing at different nutrient
supply and growth rates. On the leaf blade level, growth rates declined,
initially linearly, from the leaf base to the leaf tip. Distinct gradients
within the side veins were not observed, but the growth rates of the side
veins were closely correlated to the adjacent mid-vein segments. These
gradients flattened with increasing size of the leaf. The modular character
of growth in tobacco is discussed in the context of basic growth analysis
and as a framework for physiological, cytological, biochemical, and
molecular studies in growing plants.Key words: Nicotiana
tabacum, whole plant, total leaf area, leaf growth, growth rate,
biomass.
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