TITLE:
Linear Relationships between Photosynthetic Rate and Photochemical Energy Expressed by PAR ×Fv/Fm
AUTHORS:
Dongbao Sun, Qingsuo Wang
KEYWORDS:
Net Photosynthetic Rate, PAR, Fv/Fm, Relationship
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.9 No.2,
January
19,
2018
ABSTRACT: Photosynthetic rate (Pn) of plants is simultaneously affected by
photosynthetically active radiation (PAR)
and maximum yield of primary photochemistry (Fv/Fm).
In order to explore the quantitative relationship between Pn, PAR and Fv/Fm, those parameters were simultaneously measured for
different plant species (maize, sunflower, daylily and alfalfa), growth stages
and irrigation treatments. Results indicated that the diurnal variation of Pn had no significant
correlation with that of Fv/Fm. Mean diurnal values of Pn were linearly correlated
with those of Fv/Fm among the different
irrigation treatments of alfalfa (p Pn and Fv/Fm only at midday (12:00 and
14:00) (p Pn and PAR × Fv/Fm (p Pn is significantly related to the photochemical energy (PAR × Fv/Fm), the light energy
directly used in photochemical reactions of plants.