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. 2020 Apr 3;11:552. doi: 10.3389/fmicb.2020.00552

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Copyright © 2020 Mathew, Torky, Amin, Mourad, Ayyash, El-Keblawy, Hilal-Alnaqbi, AbuQamar and El-Tarabily.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Multivariate statistical analyses of the endogenous PGRs of Salicornia bigelovii treated with actinobacterial isolates. Principal component (PC) analysis on (A) shoot and (B) root tissues of S. bigelovii after treatment with autoclaved non-inoculated oat bran (control); auxin-producing isolate #21 (S. chartreusis UAE1, Sc); PA-producing isolate #7 (S. tritolerans RAK1, St); ACCD-producing isolate #11 (S. rochei RAMS1, Sr) consortium of the three rhizosphere-competent isolates (Sc/St/Sr). Two auxins (AIAA and AIPYA), three PA (Aput, ASpd, and Aspm) and (AACCD) obtained from actinobacterial isolates, eight agronomic growth parameters (L and DW in shoot and root separately, chl a, chl b, and Car in shoot, and SDW) and six plant growth regulators (IAA, IPYA, Put, Spd, Spm, and ACC) obtained from S. bigelovii, were tested. S. bigelovii seedlings were grown in an evaporative-cooled greenhouse and maintained at 25 ± 2°C. Values are means of eight replicates for each sampling from two independent experiments. IAA, indole-3-acetic acid; IPYA, indole-3-pyruvic acid; Put, putrescine; Spd, spermidine, Spm, spermine; ACC, 1-aminocyclopropane-1-carboxylic; PA, polyamines; ACCD, ACC deaminase; L, length; DW, dry weight; Chl, chlorophyll; Car, carotenoids; SDW, seed dry weight.