首页|How far can chlorophyll a fluorescence detect phosphorus status in wheat leaves (Triticum durum L.)
How far can chlorophyll a fluorescence detect phosphorus status in wheat leaves (Triticum durum L.)
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NSTL
Elsevier
Phosphorus (P) is an essential macronutrient for crop growth and food production since it is involved in many biochemical processes in plants. Its deficiency causes physiological, biochemical, and morphological changes. These visual changes occur when the photosynthetic apparatus system is already damaged, and they are often irreversible. Consequently, it is necessary to develop novel methods for determining nutritional plant status early in the season for rapid intervention in crop production. This challenge can be tackled using emerging techniques for crop monitoring and rapid detection of stresses. Chlorophyll a fluorescence has proved its potential to detect early abiotic stresses effects on photosynthetic efficiency. Here, we evaluate the potential of this technique to assess phosphorus status in wheat leaves (Triticum durum L.), grown in different concentrations of phosphorus insured by different fertilizer forms (two orthophosphates and one polyphosphate). Results have shown a significant effect of the applied P concentration and fertilizer form on P leaves uptake at an early development stage and improved chlorophyll content index. Phosphorus level and fertilizer form were found to affect also the kinetics of the Chlorophyll a fluorescent transient (OJIP-transient) and related fluorescence parameters. Three predictive models were generated and compared. The results from partial least squares regression (PLSR) performed on fluorescence parameters with cross-validation (CV) were: the root mean square error and the determination coefficient of cross-validation (RMSECV = 0.095 and R2 = 0.67, respectively). The obtained model predicted phosphorus leaf content with RMSE of prediction (RMSEP) of 0.079 g 0.100 g-1 and R2 of 0.56. Results showed that the generated PLS predictive model using chlorophyll a fluorescence parameters has some potential to detect phosphorus status in wheat fresh leaves and can be highly informative about the photosynthetic apparatus state under P deficiency.
PhosphorusFertilizer formChlorophyll a fluorescenceJIP-test parametersPLSRGROWTHDEFICIENCYPHOTOSYSTEMPLANTSREFLECTANCEEFFICIENCYSTRESSMAIZESOIL
NSTL
Elsevier
