Photosynthetica, 2008 (vol. 46), issue 2

Photosynthetica 2008, 46(2):179 | DOI: 10.1007/s11099-008-0029-5

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

L. Gratani1,*, M. F. Crescente1, G. Fabrini1, L. Varone1
1 Department of Plant Biology, Sapienza University of Rome, Rome, Italy

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).

Keywords: chlorophyll content; dry mass; growth analysis; leaf area ratio; net assimilation rate; net photosynthetic rate; plant biomass; plant height; stomatal conductance

Received: June 7, 2007; Accepted: October 8, 2007; Published: June 1, 2008Show citation

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Gratani, L., Crescente, M.F., Fabrini, G., & Varone, L. (2008). Growth pattern of Bidens cernua L.: relationships between relative growth rate and its physiological and morphological components. Photosynthetica, 46(2), 179. doi: 10.1007/s11099-008-0029-5.
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