استخدام مستخلص الأعشاب البحرية و البكتيريا النافعة المنتجة لهرمونات النمو النباتية لزيادة نمو نبات الساليكورنيا داخل البيوت البلاستيكية و على شواطئ البحر بدولة الإمارات العربية المتحدة

Abstract EN

base to improve the productivity of the halophytic plant Salicornia bigelovii by using plant growth promoting bacteria capable of producing plant growth regulators (PGRs) under greenhouse and field conditions in the United Arab Emirates.

Seven bacterial isolates were selected from a screening of 30 bacteria based on their ability to produce PGRs and to colonize Salicornia roots.

These seven isolates were tested in the presence and absence of the seaweed extract.

These seven bacteria were identified as Pseudomonas, Halobacillus, Serratia, Oceanobacillus, Marinobacter, Micromonospora and Streptomyces.

The nutrient contents and types and levels of PGRs in tissues of treated plants were assayed to determine the basis of growth promotion.

The plant growth promotion by bacterial isolates was most pronounced in the presence of the seaweed extract than in the presence of the seaweed extract alone or the presence of bacterial isolates alone.

The bacterial isolates were capable of producing auxins, gibberellins, cytokinins and polyamines and appeared to use seaweed extract as a source of nutrients and precursors for PGRs.

PGR levels in planta following combined treatments of the bacterial isolates and the seaweed extract were found to be significantly enhanced over other treatments.

The effect of seaweed extract appears to be more related to its role as a nutrient base for the bacterial isolates and these results indicate that the successful treatment can be effective and economical for the production of Salicornia in saline soils such as those found in the United Arab Emirates.