Salt tolerant polyembryonic mango rootstock (ML-2 and GPL-1): A putative role of endophytic bacteria by using BOX-PCR

Abstract

This study was conducted to assess the movement of Na+ and K+ between leaves, stem and root segments of tolerant and susceptible polyembryonic mango accessions under saline-sodic environment. Among the 15 diverse polyembryonic from different location of South Andaman used for screening under saline-sodic condition with the soils of pH 9.45 under pot culture experiments in polyhouse, at the time of completion of experiment (240th DAS) the accessions GPL-1, ML-2 and ML-6 were selected which exhibited tolerance to sodicity with lower mortality percent of 6.67 to 13.33% and the rest of polyembryonic seedling were having huge mortality percent ranging from 96.67 to 100.00%. The Na+/K+ ratio in roots of tolerant accessions registered lower Na+/K+ ratio ranging from 0.47 (GPL-1) to 0.61 (ML-6) and susceptible accessions was higher Na+/K+ which ranged from 3.06 (GTP-2 to 6.53 (GPL-4). The same was reverse in the stem and leaves in tolerant and susceptible accessions. Results indicated that the isolates belonged to four major phylogenetic group: low G+C Gram positive bacteria, Firmicutes, Proteobacteria and Bacteroidetes.