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    Mechanisms of Boron Tolerance and Accumulation in Plants: a Physiological Comparison of the Extremely Boron-Tolerant Plant Species, Puccinellia Distans, with the Moderately Boron-Tolerant Gypsophila Arrostil
    (AMER CHEMICAL SOC, 2010) Stiles, Amanda R.; Bautista, David; Atalay, Emine; Babaoğlu, Mehmet; Terry, Norman
    The physiological characteristics of the extremely boron (B)tolerant plant species, Puccinellia distans, were compared with those of the moderately tolerant Gypsophila arrostil, two species collected from a B-mining area of Eskisehir, Turkey. Boron was supplied to plants hydroponically at B concentrations ranging from 0.5 to 50 mg B/L for G. arrostil, and from 0.5 to 2000 mg B/L for P. distans. The results show that P. distans has a strikingly greater tolerance to B than G. arrostil. While G. arrostil was unable to survive B supply concentrations greater than 50 mg B/L, P. distans grew at B supply concentrations exceeding 1250 mg B/L. Our research supports the conclusion that from 0.5 to 50 mg B/L, P. distans is better able to restrict the accumulation of B in the whole plant, and the transport of B from root to shoot, than G. arrostil. We propose that P. distans uses several strategies to achieve B tolerance including the ability to restrict the accumulation of B relative to its accumulation of biomass, the ability to restrict the transport of B from root to shoot, and, to a lesser extent, the ability to tolerate high concentrations of B in its shoot and root tissues.