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In vitro response of date palm (Phoenix dactylifera L) to K/Na ratio under saline conditions
Alkhateeb, Suliman A; Alkhateeb, Abdullatif A; Solliman, Mohei EL-Din.
  • Alkhateeb, Suliman A; King Faisal University. College of Agriculture and Food Sciences. Environment and Natural Resources Department. Hofuf. SA
  • Alkhateeb, Abdullatif A; King Faisal University. College of Agriculture and Food Sciences. Agriculture Biotechnology Department. Hofuf. SA
  • Solliman, Mohei EL-Din; King Faisal University. College of Agriculture and Food Sciences. Agriculture Biotechnology Department. Hofuf. SA
Biol. Res ; 48: 1-9, 2015. ilus, graf, tab
Article in English | LILACS | ID: biblio-950827
ABSTRACT

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.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Potassium / Sodium / Crops, Agricultural / Salinity / Phoeniceae Language: English Journal: Biol. Res Journal subject: Biology Year: 2015 Type: Article Affiliation country: Saudi Arabia Institution/Affiliation country: King Faisal University/SA

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Full text: Available Index: LILACS (Americas) Main subject: Potassium / Sodium / Crops, Agricultural / Salinity / Phoeniceae Language: English Journal: Biol. Res Journal subject: Biology Year: 2015 Type: Article Affiliation country: Saudi Arabia Institution/Affiliation country: King Faisal University/SA