Co-regulation of photosynthetic processes under potassium deficiency across CO2 levels in soybean: mechanisms of limitations and adaptations

Photosynthesis Research
Shardendu K Singh, Vangimalla R Reddy

Abstract

Plants photosynthesis-related traits are co-regulated to capture light and CO2 to optimize the rate of CO2 assimilation (A). The rising CO2 often benefits, but potassium (K) deficiency adversely affects A that contributes to the majority of plant biomass. To evaluate mechanisms of photosynthetic limitations and adaptations, soybean was grown under controlled conditions with an adequate (control, 5.0 mM) and two K-deficient (moderate, 0.50 and severe, 0.02 mM) levels under ambient (aCO2; 400 µmol mol-1) and elevated CO2 (eCO2; 800 µmol mol-1). Results showed that under severe K deficiency, pigments, leaf absorption, processes of light and dark reactions, and CO2 diffusion through stomata and mesophyll were down co-regulated with A while light compensation point increased and photorespiration, alternative electron fluxes, and respiration were up-regulated. However, under moderate K deficiency, these traits were well co-regulated with the sustained A without any obvious limitations amid ≈ 50% reduction in leaf K level. Primary mechanism of K limitation to A was either biochemical processes (Lb ≈ 60%) under control and moderate K deficiency or the CO2 diffusion limitations (DL ≈ 70%) with greater impacts of mesophyll than stomatal ...Continue Reading

References

Jan 12, 2001·Plant Physiology·D R Ort
Apr 19, 2002·Current Opinion in Plant Biology·Donald R Ort, Neil R Baker
Sep 29, 2004·Computer Methods and Programs in Biomedicine·Brent J SheltonMonica Fisher
May 1, 1979·Plant Physiology·T R Peoples, D W Koch
Jul 31, 2007·Plant, Cell & Environment·Thomas D SharkeyEric L Singsaas
Nov 13, 2007·Plant, Cell & Environment·Jaume FlexasHipólito Medrano
Jan 31, 2012·Photosynthesis Research·Usue Pérez-LópezAlberto Muñoz-Rueda
Sep 1, 1990·Photosynthesis Research·O van Kooten, J F Snel
Jun 24, 2017·Frontiers in Plant Science·Shardendu K Singh, Vangimalla R Reddy

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Citations

Aug 4, 2019·Physiologia Plantarum·Tonghua PanZhirong Zou
Mar 7, 2021·Plants·Cyril Abadie, Guillaume Tcherkez

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Methods Mentioned

BETA
PCR

Software Mentioned

SAS
Excel
pdmix800

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