Figure 2.

Relationship between grain yield (GY) and different variables related to the functioning of the photosynthetic apparatus. (a) Grain yield and quantum yield of photosystem II (ΦII) as a function of the gradient of non-photochemical quenching ΦNPQ (change in the colour of violet and red as greater to lesser value) and magnitude of non-regulated processes ΦNO (size of the circle), parameters that affect the response variable. (b) Grain yield and linear electron flow (LEF) as a function of the gradient of PSI Over Reduce Center PSIor (change in the colour of violet and red as greater to lesser value) and magnitude of PSI Open Center PSIopen (size of the circle), parameters that affect the response variable. The dotted lines on the axes correspond to the means of the dependent and independent variables.