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Abstract Detail

Physiology & Ecophysiology

WU, HONGHONG [1], Tito, Nicolas [1], Giraldo, Juan Pablo [1].

Plant Nanobionic Protection from Abiotic Stress Enhances the Light and Carbon Reactions of Photosynthesis in Arabidopsis.

Plant abiotic stress leads to accumulation of reactive oxygen species (ROS) resulting in decreased photosynthetic performance. We demonstrate that a plant nanobionics approach of interfacing cerium oxide nanoparticles (nanoceria) with chloroplasts in vivo augments ROS scavenging and photosynthesis of Arabidopsis thaliana plants under excess light, heat, and dark chilling. Negatively charged nanoceria preferentially localize inside chloroplasts of leaf mesophyll cells than positively charged nanoceria. Nanoceria are transported into chloroplasts via non-endocytic pathways, influenced by the electrochemical gradient of the plasma membrane potential. Nanoceria augment plant ROS scavenging including superoxide anion and hydroxyl radicals, for the latter ROS there is no known plant enzyme scavenger. Plants with embedded nanoceria exposed to abiotic stress have enhanced quantum yield of photosystem II, carbon assimilation rates, and Rubisco carboxylation rates relative to plants without nanoparticles. Nanoceria improves both quantum yield of photochemistry and carbon assimilation rates under excess light but only the carboxylation reactions under heat and dark chilling. This study demonstrates that nanoceria can be applied as a tool to study the impact of oxidative stress on plant photosynthesis and protect plants from abiotic stress.

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1 - UC Riverside, Botany and Plant Sciences, 3401 Watkins Drive, Batchelor Hall 1133, Riverside, CA, 92521, USA

abiotic stress
cerium oxide nanoparticles
plant nanobionics.

Presentation Type: Oral Paper
Session: 23, Physiology & Ecophysiology
Location: Fort Worth Ballroom 6/Omni Hotel
Date: Tuesday, June 27th, 2017
Time: 10:45 AM
Number: 23008
Abstract ID:132
Candidate for Awards:None

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