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245	1	0	_aNanoparticle size and coating chemistry control foliar uptake pathways, translocation and leaf-to-rhizosphere transport in wheat
490	0		_vACS nano, 13(5), p. 5291-5305, 2019
520	3		_aNanoenabled foliar-applied agrochemicals can potentially be safer and more efficient than conventional products. However, limited understanding about how nanoparticle properties influence their interactions with plant leaves, uptake, translocation through the mesophyll to the vasculature, and transport to the rest of the plant prevents rational design. This study used a combination of Au quantification and spatial analysis to investigate how size (3, 10, or 50 nm)and coating chemistry (PVP versus citrate)of gold nanoparticles (AuNPs)influence these processes. Following wheat foliar exposure to AuNPs suspensions (?280 ng per plant), adhesion on the leaf surface was increased for smaller sizes, and PVP-AuNPs compared to citrate-AuNPs. After 2 weeks, there was incomplete uptake of citrate-AuNPs with some AuNPs remaining on the outside of the cuticle layer. However, the fraction of citrate-AuNPs that had entered the leaf was translocated efficiently to the plant vasculature. In contrast, for similar sizes, virtually all of the PVP-AuNPs crossed the cuticle layer after 2 weeks, but its transport through the mesophyll cells was lower. As a consequence of PVP-AuNP accumulation in the leaf mesophyll, wheat photosynthesis was impaired. Regardless of their coating and sizes, the majority of the transported AuNPs accumulated in younger shoots (10-30 per cent)and in roots (10-25 per cent), and 5-15 per cent of the NPs <50 nm were exuded into the rhizosphere soil. A greater fraction of larger sizes AuNPs (presenting lower ? potentials)was transported to the roots. The key hypotheses about the NPs physical-chemical and plant physiology parameters that may matter to predict leaf-to-rhizosphere transport are also discussed.
650	1	4	_aFOLIAR APPLICATION OF NANOPARTICLES
650	1	4	_aUPTAKE PATHWAYS
650	1	4	_aIN PLANTA TRANSLOCATION
650	1	4	_aROOT EXUDATION
650	1	4	_aAGRICULTURE
650	1	4	_aENHANCED DARK-FIELD MICROSCOPY COUPLED WITH HYPERSPECTRAL IMAGING
650	1	4	_aX-RAY
700	1	2	_aAvellan, A.
700	1	2	_aYun, J.
700	1	2	_aZhang, Y.
700	1	2	_aSpielman-Sun, E.
700	1	2	_aUnrine, J. M.
700	1	2	_aThieme, J.
700	1	2	_aLowry, G. V.
856	4	0	_uhttps://drive.google.com/file/d/1nwYuOEX19pWPtF9tGiO3RLLFGfkiyfUx/view?usp=drivesdk _zPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
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