caa a22 4500 445841699 CHVBK 20180317145346.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s10725-011-9618-6 doi (NATIONALLICENCE)springer-10.1007/s10725-011-9618-6 Improved growth performance of the mangrove Avicennia marina seedlings using a 1-aminocyclopropane-1-carboxylic acid deaminase-producing isolate of Pseudoalteromonas maricaloris [Elektronische Daten] [Khaled El-Tarabily, Tarek Youssef] Out of 62 bacterial isolates obtained from the mangrove Avicennia marina rhizosphere that grows along the Abu Dhabi coast, United Arab Emirates (UAE), an isolate of Pseudoalteromonas maricaloris (Wild type strain) (WT) produced relatively high levels of 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase in vitro. Application of this WT strain under greenhouse conditions to A. marina seedlings significantly (P<0.05), reduced endogenous levels of ACC in the roots and shoots, and significantly (P<0.05) increased the levels of in planta endogenous plant growth regulators (PGRs) including indole-3-acetic acid (IAA), indole-3-pyruvic acid (IPYA), putrescine (Put), spermidine (Spd) and spermine (Spm) in roots and shoots compared with control mangrove seedlings. WT application has also significantly (P<0.05) increased photosynthetic pigment contents, photosynthetic carbon assimilation, plant water use efficiency and promoted mangrove seedlings growth characteristics including increased dry weight and length of roots and shoots, total leaf area and the number of the side branches compared with control mangrove seedlings. In comparison, an ACC deaminase non-producing mutant strain (NPM) failed to reduce endogenous levels of ACC in the roots and shoots and also failed to increase endogenous PGRs and photosynthetic pigments and did not promote seedling growth. Both WT and NPM strains were incapable of producing in vitro detectable levels of IAA, IPYA, Gibberellic acid (GA3), zeatin (Z), Put, Spd and Spm in the culture filtrates. This study demonstrated for the first time the ability of ACC deaminase-producing bacteria to promote mangrove growth under greenhouse conditions. P. maricaloris has potential as biological inoculants to promote the growth of mangrove seedlings in afforestation programs in nutrient impoverished sediments in hyper-saline coastal areas in the UAE. Springer Science+Business Media B.V., 2011 Biological inoculants nationallicence Plant growth-promoting bacteria nationallicence Plant growth regulators nationallicence Rhizosphere nationallicence UAE nationallicence PGPB : Plant growth promoting bacteria nationallicence ACC : 1-aminocyclopropane-1-carboxylic acid nationallicence IAA : Indole-3-acetic acid nationallicence IPYA : Indole-3-pyruvic acid nationallicence GA3 : Gibberellic acid nationallicence iP : Isopentenyl adenine nationallicence iPR : Isopentenyl adenosine nationallicence Z : Zeatin nationallicence Put : Putrescine nationallicence Spd : Spermidine nationallicence Spm : Spermine nationallicence El-Tarabily Khaled Department of Biology, Faculty of Science, United Arab Emirates University, 17551, Al-Ain, United Arab Emirates aut Youssef Tarek Department of Biology, Faculty of Science, United Arab Emirates University, 17551, Al-Ain, United Arab Emirates aut Plant Growth Regulation Springer Netherlands 65/3(2011-12-01), 473-483 0167-6903 65:3<473 2011 65 10725 https://doi.org/10.1007/s10725-011-9618-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10725-011-9618-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- El-Tarabily Khaled Department of Biology, Faculty of Science, United Arab Emirates University, 17551, Al-Ain, United Arab Emirates aut NATIONALLICENCE 700 1- Youssef Tarek Department of Biology, Faculty of Science, United Arab Emirates University, 17551, Al-Ain, United Arab Emirates aut NATIONALLICENCE 773 0- Plant Growth Regulation Springer Netherlands 65/3(2011-12-01), 473-483 0167-6903 65:3<473 2011 65 10725 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer