Effect of elevated CO₂ and temperature on phosphorus efficiency of wheat grown in an Inceptisol of subtropical India

Abstract

In a phytotron experiment, wheat was grown under two levels of atmospheric CO 2 [ambient (385 ppm) vs. elevated (650 ppm)], two levels of temperature (ambient vs. ambient +3°C) superimposed with three levels of phosphorus (P) fertilization: 0, 100, and 200% of recommended dose. Various measures of P acquisition and utilization efficiency were estimated at crop maturity. In general, dry matter yields of all plant parts increased under elevated CO 2 (EC) and decreased under elevated temperature (ET); however, under concurrently elevated CO 2 and temperature (ECT), root (+36%) and leaf (+14.7%) dry weight increased while stem (-12.3%) and grain yield (-17.3%) decreased, leading to a non-significant effect on total biomass yield. Similarly, total P uptake increased under EC and decreased under ET, with an overall increase of 17.4% under ECT, signifying higher P requirements by plants grown thereunder. Although recovery efficiency of applied P fertilizer increased by 27%, any possible benefit of this increase was negated by the reduced physiological P efficiency (PPE) and P utilization efficiency (PUtE) under ECT. Overall, there was ~17% decline in P use efficiency (PUE) (i.e. grain yield/applied P) of wheat under ECT.

Concurrent elevation of CO2, O3and temperature severely affects oil quality and quantity in rapeseed

“…Compared with ambient conditions, the treatment with elevated [CO 2 ] did not increase seed production significantly, while under elevated T and the combination of elevated [CO 2 ] and T, the seed yield was decreased by approximately 50% ( Frenck et al , 2013 ; Supplementary Table S2 ). This trend in seed production is supported by previous studies on wheat and rapeseed, where growth was studied in the two-factor treatments with elevated [CO 2 ] and T ( Qaderi et al , 2006 ; Manoj-Kumar et al , 2012 ). In the two-factor treatment with elevated [CO 2 ] and T in our study, the essential FA, C18:3, decreased by 45% in addition to the 50% reduction of the seed set, and the oil content decreased by 10%.…”

A comparative study of Chilli (Capsicum Annuum) on biomass production by phosphorus application through micro-dose placement, broadcast, and optimized seedling Root-dip in P-enriched slurry

“…Finally, the P uptake in the biomass was determined by multiplying the P content (%) with the corresponding dry biomass yield. The calculation of P use e ciency (PUE) and P recovery e ciency (PRE) was carried out following the methods described by Hussein (2009) and Kumar et al (2012).…”

Higher Photochemical Quenching and Better Maintenance of Carbon Dioxide Fixation Are Key Traits for Phosphorus Use Efficiency in the Wheat Breeding Line, RAC875

“…Thus, a study on a large wheat population would confirm if low P significantly increases NPQ under low P in inefficient genotypes. Also, elevated CO 2 through climate change and P deficiency are current issues (Singh and Reddy, 2014;Manoj-Kumar et al, 2018) and the CO 2 response curve indicates that low P had more of a negative effect on the photosynthetic rate of Wyalkatchem at elevated CO 2 . It would be interesting to study the responses of these two wheat genotypes to the combination effect of elevated CO 2 and P deficiency in a larger, more controlled manner.…”