Effect of light regime on Drosera Rotundifolia
Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
The perennial carnivorous plant Drosera rotundifolia with its red leaves has interested scientists for ages. The red colour of its leaves was for long time believed to help in luring prey insects, but later studies have indicated that it might also function as an alert to pollinators and to avoid over capture of pollinators. Either of the functions is important for the carnivorous investment of D. rotundifolia. As the red colour in the leaves is determined by the accumulation of the UV-positive compound anthocyanin, it is possible that the leaf colouration is affected by the surrounding light regime. Therefore, it would be useful to understand the function of the red colouration and how it relates to the local light regime. In my study, leaf colour varied a lot under different light regimes, however with no significant pattern along light gradient. Leaf size exerted an effect on leaf colour, as smaller leaves were redder. In addition, effects of light on morphological traits were detected. With an increase of sun exposure, D. rotundifolia had higher specific leaf dry mass. Plants had larger total leaf area on plots with intermediate vascular plant vegetation height. Exposure to light and insects and nutrient conditions indicated by vascular plant height could in combination affect the growth of leaves of D. rotundifolia. Also the competition of nutrient by Sphagnum fuscum (Schimper) H. Klinggräff could be one of the factors influencing the leaf area of D. rotundifolia. Thus, this study found an effect of light on morphological traits of D. rotundifolia, but lacked evidence on colouration. Further studies could be carried out with a more detailed description of the light regime when illustrating the light effect on colouration of leaves of D. rotundifolia.
Place, publisher, year, edition, pages
2015. , 20 p.
drosera, light, colour
IdentifiersURN: urn:nbn:se:uu:diva-287411OAI: oai:DiVA.org:uu-287411DiVA: diva2:922711
Master Programme in Biology
2015-03-13, Lecture room 6, EBC, Norbyvägen 18 D, 75236, Uppsala, 09:30 (English)
Svensson, Brita, Professor
Brunberg, Anna, Associate Professor