In vitro response of date palm (Phoenix dactylifera L.) to K/Na ratio under saline conditions

BACKGROUND: Salinity is a serious factor limiting the productivity of agricultural plants. One of the potential problems for plants growing under saline conditions is the inability to up take enough K+. The addition of K+ may considerably improve the salt tolerance of plants grown under salinity. It...

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Autores principales:	Alkhateeb,Suliman A, Alkhateeb,Abdullatif A, Solliman,Mohei EL-Din
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2015
Materias:	Date palm In vitro Ion relations K/Na ratio Salinity
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100063
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spelling	oai:scielo:S0716-976020150001000632016-02-16In vitro response of date palm (Phoenix dactylifera L.) to K/Na ratio under saline conditionsAlkhateeb,Suliman AAlkhateeb,Abdullatif ASolliman,Mohei EL-Din Date palm In vitro Ion relations K/Na ratio Salinity BACKGROUND: Salinity is a serious factor limiting the productivity of agricultural plants. One of the potential problems for plants growing under saline conditions is the inability to up take enough K+. The addition of K+ may considerably improve the salt tolerance of plants grown under salinity. It is assumed that increasing the K+ supply at the root zone can ameliorate the reduction in growth imposed by high salinity. The present study aims to determine whether an increase in the K/Na ratio in the external media would enhance the growth of date palm seedlings under in vitro saline conditions METHODS: Date palm plants were grown at four concentrations of Na + K/Cl (mol/m³) with three different K/Na ratios. The 12 salt treatments were added to modified MS medium. The modified MS medium was further supplemented with sucrose at 30 g/l RESULTS: Growth decreased substantially with increasing salinity. Growth expressed as shoot and root weight, enhanced significantly with certain K/Na ratios, and higher weight was maintained in the presence of equal K and Na. It is the leaf length, leaf thickness and root thickness that had significant contribution on total dry weight. Na+ contents in leaf and root increased significantly increased with increasing salinity but substantial decreases in Na+ contents were observed in the leaf and root with certain K/Na ratios. This could be attributed to the presence of a high K+ concentration in the media. The internal Na+ concentration was higher in the roots in all treatments, which might indicate a mechanism excluding Na+ from the leaves and its retention in the roots. K/Na ratios up to one significantly increased the leaf and root K+ concentration, and it was most pronounced in leaves. The K+ contents in leaf and root was not proportional to the K+ increase in the media, showing a high affinity for K+ uptake at lower external K+ concentrations, but this mechanism continues to operate even with high external Na+ concentrations CONCLUSION: Increasing K/Na ratios in the growing media of date plam significantly reduced the absorption of Na+ less than 200 mM and also balance ions compartmentalizationinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileBiological Research v.48 20152015-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100063en10.1186/S40659-015-0055-2
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Date palm In vitro Ion relations K/Na ratio Salinity
spellingShingle	Date palm In vitro Ion relations K/Na ratio Salinity Alkhateeb,Suliman A Alkhateeb,Abdullatif A Solliman,Mohei EL-Din In vitro response of date palm (Phoenix dactylifera L.) to K/Na ratio under saline conditions
description	BACKGROUND: Salinity is a serious factor limiting the productivity of agricultural plants. One of the potential problems for plants growing under saline conditions is the inability to up take enough K+. The addition of K+ may considerably improve the salt tolerance of plants grown under salinity. It is assumed that increasing the K+ supply at the root zone can ameliorate the reduction in growth imposed by high salinity. The present study aims to determine whether an increase in the K/Na ratio in the external media would enhance the growth of date palm seedlings under in vitro saline conditions METHODS: Date palm plants were grown at four concentrations of Na + K/Cl (mol/m³) with three different K/Na ratios. The 12 salt treatments were added to modified MS medium. The modified MS medium was further supplemented with sucrose at 30 g/l RESULTS: Growth decreased substantially with increasing salinity. Growth expressed as shoot and root weight, enhanced significantly with certain K/Na ratios, and higher weight was maintained in the presence of equal K and Na. It is the leaf length, leaf thickness and root thickness that had significant contribution on total dry weight. Na+ contents in leaf and root increased significantly increased with increasing salinity but substantial decreases in Na+ contents were observed in the leaf and root with certain K/Na ratios. This could be attributed to the presence of a high K+ concentration in the media. The internal Na+ concentration was higher in the roots in all treatments, which might indicate a mechanism excluding Na+ from the leaves and its retention in the roots. K/Na ratios up to one significantly increased the leaf and root K+ concentration, and it was most pronounced in leaves. The K+ contents in leaf and root was not proportional to the K+ increase in the media, showing a high affinity for K+ uptake at lower external K+ concentrations, but this mechanism continues to operate even with high external Na+ concentrations CONCLUSION: Increasing K/Na ratios in the growing media of date plam significantly reduced the absorption of Na+ less than 200 mM and also balance ions compartmentalization
author	Alkhateeb,Suliman A Alkhateeb,Abdullatif A Solliman,Mohei EL-Din
author_facet	Alkhateeb,Suliman A Alkhateeb,Abdullatif A Solliman,Mohei EL-Din
author_sort	Alkhateeb,Suliman A
title	In vitro response of date palm (Phoenix dactylifera L.) to K/Na ratio under saline conditions
title_short	In vitro response of date palm (Phoenix dactylifera L.) to K/Na ratio under saline conditions
title_full	In vitro response of date palm (Phoenix dactylifera L.) to K/Na ratio under saline conditions
title_fullStr	In vitro response of date palm (Phoenix dactylifera L.) to K/Na ratio under saline conditions
title_full_unstemmed	In vitro response of date palm (Phoenix dactylifera L.) to K/Na ratio under saline conditions
title_sort	in vitro response of date palm (phoenix dactylifera l.) to k/na ratio under saline conditions
publisher	Sociedad de Biología de Chile
publishDate	2015
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100063
work_keys_str_mv	AT alkhateebsulimana invitroresponseofdatepalmphoenixdactyliferaltoknaratioundersalineconditions AT alkhateebabdullatifa invitroresponseofdatepalmphoenixdactyliferaltoknaratioundersalineconditions AT sollimanmoheieldin invitroresponseofdatepalmphoenixdactyliferaltoknaratioundersalineconditions
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In vitro response of date palm (Phoenix dactylifera L.) to K/Na ratio under saline conditions

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