Effects of substrate water potential in root growth of Agave salmiana Otto ex Salm-Dyck seedlings

The objective of this study was to test the hypothesis that root of maguey (Agave salmiana Otto ex Salm-Dyck) seedlings reacts during the first 24 h to low substrate water potential (Yw), by anatomical modifications. Three-4 cm root length seedlings were planted in vermiculite for 24 h at Yw between...

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Autores principales:	PEÑA-VALDIVIA,CECILIA B, SÁNCHEZ-URDANETA,ADRIANA B
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2009
Materias:	Maguey proline root anatomy root growth water deficit water stress
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000200013
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spelling	oai:scielo:S0716-976020090002000132009-10-09Effects of substrate water potential in root growth of Agave salmiana Otto ex Salm-Dyck seedlingsPEÑA-VALDIVIA,CECILIA BSÁNCHEZ-URDANETA,ADRIANA B Maguey proline root anatomy root growth water deficit water stress The objective of this study was to test the hypothesis that root of maguey (Agave salmiana Otto ex Salm-Dyck) seedlings reacts during the first 24 h to low substrate water potential (Yw), by anatomical modifications. Three-4 cm root length seedlings were planted in vermiculite for 24 h at Yw between -0.03 and -2.35 MPa. Root dimensions, proline content and anatomy were evaluated. Substrate ψw between -0.65 and -2.35 MPa did not significantly affect longitudinal root growth. However, proline content significantly increased from 1.6 to 2.1 emoles mg-1. Significant reductions of transverse root area (41 %), thickness of mucilage covering the epidermis (47 %), thickness of epidermis (between 15 and 46 %), area of the parenchyma (between 35 and 41 %) and number of vessels (up to 28 %) were observed with Yw of -2.35 MPa. In contrast, thickness of xylem wall, diameter of xylem vessels and the number of cells of the cortex of the differentiation root region significantly increased (64, 17, and 97 %, respectively). The anatomical changes associated with low substrate Yw indicate a net increase of root apoplatic paths; structures involved in water conduction increased their diameter under low substrate Yw conditions and anatomical changes occurred during the first 24 h of water stress.info:eu-repo/semantics/openAccessSociedad de Biología de ChileBiological Research v.42 n.2 20092009-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000200013en10.4067/S0716-97602009000200013
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Maguey proline root anatomy root growth water deficit water stress
spellingShingle	Maguey proline root anatomy root growth water deficit water stress PEÑA-VALDIVIA,CECILIA B SÁNCHEZ-URDANETA,ADRIANA B Effects of substrate water potential in root growth of Agave salmiana Otto ex Salm-Dyck seedlings
description	The objective of this study was to test the hypothesis that root of maguey (Agave salmiana Otto ex Salm-Dyck) seedlings reacts during the first 24 h to low substrate water potential (Yw), by anatomical modifications. Three-4 cm root length seedlings were planted in vermiculite for 24 h at Yw between -0.03 and -2.35 MPa. Root dimensions, proline content and anatomy were evaluated. Substrate ψw between -0.65 and -2.35 MPa did not significantly affect longitudinal root growth. However, proline content significantly increased from 1.6 to 2.1 emoles mg-1. Significant reductions of transverse root area (41 %), thickness of mucilage covering the epidermis (47 %), thickness of epidermis (between 15 and 46 %), area of the parenchyma (between 35 and 41 %) and number of vessels (up to 28 %) were observed with Yw of -2.35 MPa. In contrast, thickness of xylem wall, diameter of xylem vessels and the number of cells of the cortex of the differentiation root region significantly increased (64, 17, and 97 %, respectively). The anatomical changes associated with low substrate Yw indicate a net increase of root apoplatic paths; structures involved in water conduction increased their diameter under low substrate Yw conditions and anatomical changes occurred during the first 24 h of water stress.
author	PEÑA-VALDIVIA,CECILIA B SÁNCHEZ-URDANETA,ADRIANA B
author_facet	PEÑA-VALDIVIA,CECILIA B SÁNCHEZ-URDANETA,ADRIANA B
author_sort	PEÑA-VALDIVIA,CECILIA B
title	Effects of substrate water potential in root growth of Agave salmiana Otto ex Salm-Dyck seedlings
title_short	Effects of substrate water potential in root growth of Agave salmiana Otto ex Salm-Dyck seedlings
title_full	Effects of substrate water potential in root growth of Agave salmiana Otto ex Salm-Dyck seedlings
title_fullStr	Effects of substrate water potential in root growth of Agave salmiana Otto ex Salm-Dyck seedlings
title_full_unstemmed	Effects of substrate water potential in root growth of Agave salmiana Otto ex Salm-Dyck seedlings
title_sort	effects of substrate water potential in root growth of agave salmiana otto ex salm-dyck seedlings
publisher	Sociedad de Biología de Chile
publishDate	2009
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000200013
work_keys_str_mv	AT penavaldiviaceciliab effectsofsubstratewaterpotentialinrootgrowthofagavesalmianaottoexsalmdyckseedlings AT sanchezurdanetaadrianab effectsofsubstratewaterpotentialinrootgrowthofagavesalmianaottoexsalmdyckseedlings
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Effects of substrate water potential in root growth of Agave salmiana Otto ex Salm-Dyck seedlings

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