Question

Plants - Coleus, Fuschia Light measured with L-cor light meter in propagation room. HL-High light 50-60 mmol photons m-2 s-1 LL- Low light "1 mmol photons m-2 5-1 these values were measured on a gloomy day. They are likely a good deal higher when it is sunny. Photosynthesis measured as ETR (electron transport rate) calculated from Chlorophyll fluorescence parameters Light Curve - Fuschia Irradiance ETR yield 107 10.1 Photochemical Yield 16.2 leid 445 EN 85W 0.77 0.648 0.489 0.351 0.223 0.164 0.114 0.085 0.056 961 1350 1764 2352 500 1000 1500 2000 Irradiance (umol photons/m/s) 2500

Answer 1

1- at 961 irradiance and photosynthesis yield is 22.9 photosynthesis became saturated

2.- 22.9 ETR is Maximum

3-In a changing climate, the dynamics between fluorescence (Fs) yield and photochemical (P) yield are important for understanding the photosynthesis-fluorescence relation.The ratio of Fs yield and P yield tends to be stable under high light intensity, although it is important to further investigate the relationship between these two yields and their reaction to environmental conditions under medium and low light.In summer maize (Zea mays L.) plants grown under intermediate light conditions in a climate chamber, we performed leaf-scale measurements of the fluorescence parameters through pulse-amplitude modulation (PAM). Plants were treated as stressed with mild water, and stressed without water.Results showed a decrease in P yield in reaction to moderate water stress under intermediate and low light conditions was followed by increases in Fs yield and non-photochemical quenching yield (NPQ). In moderate and low light conditions, Fs yield was negatively associated with P yield when there was ample soil water in the root zoneIn low light, the correlation between yield of Fs and yield of P was negative under water stress, but at higher light levels became positive. Fs yield was negatively related to P yield when NPQ yield was low; however, when NPQ controlled the excessive light dissipation, they were synergistically and positively linked.