Effect of light intensity on the gas exchange characteristics and total pigment content of Psidium guajava

International Conference on Biodiversity 2018

Idris, A.^1^2 ; Linatoc, A.C.^1 ; Bin Abu Bakar, M.F.^1 ; Takai, Z.I.^1^3

Faculty of Applied Sciences and Technology, Universiti Tun Hussein Onn Malaysia (UTHM), Hub Pendidikan Tinggi Pagoh, KM1, Jalan Panchor, Muar, Johor

84600, Malaysia^1

Faculty of Sciences, Federal University Dutse, PMB 7176, Jigawa State, Nigeria^2

Faculty of Sciences, Yusuf Maitama Sule University Kano, PMB 3236, Kano State, Nigeria^3

关键词: Chlorophyll contents;    Differential methods;    Gas exchange characteristics;    Light compensation point;    Photosynthetic capacity;    Photosynthetic light;    Photosynthetic pigments;    Total anthocyanin contents;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/269/1/012020/pdf
DOI  :  10.1088/1755-1315/269/1/012020

来源: IOP

【 摘 要 】

The gas exchange characteristics and photosynthetic pigments of a plant can be affected by the amount of light received by the plant. The objective of this research is to investigate the effect of light intensity on the gas exchange characteristics and total pigment content TPC of sun and shade leaves of Psidium guajava. Sun and shade leaves were studied, and their photosynthetic light response characteristics including light saturation point (LSP), light compensation point (LCP) and apparent quantum yield were estimated. Carotenoids (Car) and chlorophyll (Chl) contents were quantified spectrophotometrically, while total anthocyanin content (TAC) was determined using the pH differential method. The result of this study shows that high light intensity influence gas exchange, carotenoid content and total anthocyanin content while low light intensity influence chlorophyll content especially chlorophyll b of the studied plant. As the light intensity increases, Amax, light saturation point and light compensation point increases. There are significant differences between the photosynthetic light response characteristics and total pigment content of sun and shade leaves (P