Comparative branching order and root anatomy of clonal and seed-grown avocado trees (Persea americana Mill.)

Abstract Characterizing roots according to their branching order and anatomy is a useful approach for identifying functional differences within and among root systems. In this study, the root branching order and the anatomy of each root order (stele and cortex area) were examined in two-year-old &am...

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Autores principales:	Fassio,Claudia, Cautin,Ricardo, Perez-Donoso,Alonso G., Castro,Mónica, Bonomelli,Claudia
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Chile.Facultad de Agronomía e Ingeniería Forestal 2020
Materias:	Branching order cortex propagation technique root anatomy stele
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S2452-57312020000200134
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spelling	oai:scielo:S2452-573120200002001342020-09-21Comparative branching order and root anatomy of clonal and seed-grown avocado trees (Persea americana Mill.)Fassio,ClaudiaCautin,RicardoPerez-Donoso,Alonso G.Castro,MónicaBonomelli,Claudia Branching order cortex propagation technique root anatomy stele Abstract Characterizing roots according to their branching order and anatomy is a useful approach for identifying functional differences within and among root systems. In this study, the root branching order and the anatomy of each root order (stele and cortex area) were examined in two-year-old “Duke 7” avocado (Persea americana Mill.) trees propagated by seed and by clonal techniques. The root systems were found to have three different root orders that exhibited differences in the occurrence of secondary xylem. Fine roots (first- and second-order roots) presented only primary growth, whereas the main roots (third-order roots) exhibited secondary growth. Transverse sections of roots from the different orders showed pentarch, hexarch or heptarch tracheal element distributions. Newly emerged, long, unbranched pioneer roots were observed only in the clonal trees and showed particular anatomical features, such as a larger diameter and a proportionally greater cortex area than other roots, as well as primary growth. Additionally, significant differences were found between clonal and seedling trees in the stele area of third-order roots; clonal propagation resulted in larger stele areas in this type of root. Our results suggest that propagation methods influence the presence of new pioneer roots and the anatomy of third-order roots; clonal root systems branch more extensively than seed-grown root systems and develop a vascular system with a larger transport capacity.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Chile.Facultad de Agronomía e Ingeniería ForestalInternational journal of agriculture and natural resources v.47 n.2 20202020-08-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S2452-57312020000200134en10.7764/ijanr.v47i2.2240
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Branching order cortex propagation technique root anatomy stele
spellingShingle	Branching order cortex propagation technique root anatomy stele Fassio,Claudia Cautin,Ricardo Perez-Donoso,Alonso G. Castro,Mónica Bonomelli,Claudia Comparative branching order and root anatomy of clonal and seed-grown avocado trees (Persea americana Mill.)
description	Abstract Characterizing roots according to their branching order and anatomy is a useful approach for identifying functional differences within and among root systems. In this study, the root branching order and the anatomy of each root order (stele and cortex area) were examined in two-year-old “Duke 7” avocado (Persea americana Mill.) trees propagated by seed and by clonal techniques. The root systems were found to have three different root orders that exhibited differences in the occurrence of secondary xylem. Fine roots (first- and second-order roots) presented only primary growth, whereas the main roots (third-order roots) exhibited secondary growth. Transverse sections of roots from the different orders showed pentarch, hexarch or heptarch tracheal element distributions. Newly emerged, long, unbranched pioneer roots were observed only in the clonal trees and showed particular anatomical features, such as a larger diameter and a proportionally greater cortex area than other roots, as well as primary growth. Additionally, significant differences were found between clonal and seedling trees in the stele area of third-order roots; clonal propagation resulted in larger stele areas in this type of root. Our results suggest that propagation methods influence the presence of new pioneer roots and the anatomy of third-order roots; clonal root systems branch more extensively than seed-grown root systems and develop a vascular system with a larger transport capacity.
author	Fassio,Claudia Cautin,Ricardo Perez-Donoso,Alonso G. Castro,Mónica Bonomelli,Claudia
author_facet	Fassio,Claudia Cautin,Ricardo Perez-Donoso,Alonso G. Castro,Mónica Bonomelli,Claudia
author_sort	Fassio,Claudia
title	Comparative branching order and root anatomy of clonal and seed-grown avocado trees (Persea americana Mill.)
title_short	Comparative branching order and root anatomy of clonal and seed-grown avocado trees (Persea americana Mill.)
title_full	Comparative branching order and root anatomy of clonal and seed-grown avocado trees (Persea americana Mill.)
title_fullStr	Comparative branching order and root anatomy of clonal and seed-grown avocado trees (Persea americana Mill.)
title_full_unstemmed	Comparative branching order and root anatomy of clonal and seed-grown avocado trees (Persea americana Mill.)
title_sort	comparative branching order and root anatomy of clonal and seed-grown avocado trees (persea americana mill.)
publisher	Pontificia Universidad Católica de Chile.Facultad de Agronomía e Ingeniería Forestal
publishDate	2020
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S2452-57312020000200134
work_keys_str_mv	AT fassioclaudia comparativebranchingorderandrootanatomyofclonalandseedgrownavocadotreesperseaamericanamill AT cautinricardo comparativebranchingorderandrootanatomyofclonalandseedgrownavocadotreesperseaamericanamill AT perezdonosoalonsog comparativebranchingorderandrootanatomyofclonalandseedgrownavocadotreesperseaamericanamill AT castromonica comparativebranchingorderandrootanatomyofclonalandseedgrownavocadotreesperseaamericanamill AT bonomelliclaudia comparativebranchingorderandrootanatomyofclonalandseedgrownavocadotreesperseaamericanamill
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Comparative branching order and root anatomy of clonal and seed-grown avocado trees (Persea americana Mill.)

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