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Growth pattern of Bidens cernua L.: relationships between relative growth rate and its physiological and morphological components

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Photosynthetica

Abstract

Seedlings of Bidens cernua L. emerged when mean air temperature was 17.0±1.3 °C. The highest net photosynthetic rate (P N), 13.8±0.8 µmol(CO2) m−2 s−1, was monitored during the vegetative period (May–August), decreasing on an average by 50 % during flowering (August–September) and during fruiting (September–November) phases. The senescence phase (October–November) was characterised by 79, 58, and 18 % decrease of P N, chlorophyll content, and leaf area (LA), respectively, from the maximum values. The time span from seedling emergence to the end of fruiting phase was 202 d. The total plant biomass was 1.58±0.05 g of which 81 % was aboveground plant portion. The total dry mass relative growth rate averaged over the assimilation period was 0.0804±0.0002 kg kg−1 d−1, and it was correlated to both the net assimilation rate (NAR) and the leaf area ratio (LAR).

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Abbreviations

Chl:

chlorophyll content

DM:

dry mass

g s :

stomatal conductance

H:

plant height

LA:

leaf area

LAR:

leaf area ratio

LE:

plant height growth efficiency

LMR:

leaf mass ratio

NAR:

net assimilation rate

P N :

net photosynthetic rate

PAR:

photosynthetically active radiation

RGR:

relative growth rate

RGRtot :

total dry mass relative growth rate

SLA:

specific leaf area

TLA:

total leaf area

TPB:

total plant dry mass

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Authors and Affiliations

  1. Department of Plant Biology, Sapienza University of Rome, P. le A. Moro 5, 00185, Rome, Italy

    L. Gratani, M. F. Crescente, G. Fabrini & L. Varone

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  1. L. Gratani
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  2. M. F. Crescente
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  3. G. Fabrini
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  4. L. Varone
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Correspondence to L. Gratani.

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Gratani, L., Crescente, M.F., Fabrini, G. et al. Growth pattern of Bidens cernua L.: relationships between relative growth rate and its physiological and morphological components. Photosynthetica 46, 179–184 (2008). https://doi.org/10.1007/s11099-008-0029-5

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  • DOI: https://doi.org/10.1007/s11099-008-0029-5

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