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Antioxidant and Photosynthetic Responses in Plants Under Boron Toxicity: A Review

M. Landi,E. Degl'innocenti,A. Pardossi,L. Guidi

Published 2012 in American Journal of Agricultural and Biological Sciences

ABSTRACT

Boron (B) is a micronutrient that has long been kno wn essential not only for plants and animals. Other wise, in crop plants the range of B concentration from es sentiality to toxicity appears extremely narrow. Al though B deficiency has been well investigated, during rec ent years many researchers have also investigated b oron toxicity effects, making progress in the comprehens ion of boron transport within plants. Moreover, worldwide B is not uniformed distributed and, espec ially in arid and semiarid regions, high B concentrations are found in the soil. Boron in plan ts primarily moves following transpiration stream e ven though recent evidences have also confirmed the inv olvement of B transporter and channel (BOR and NIP). In general, the species that tolerate B excess tend s to accumulate less B compared to sensitive specie s. Likewise other abiotic stresses, antioxidants may b e involved in the scavenging of Reactive Oxygen Species (ROS) triggered by B toxicity. Photosynthesis parameters in plants grown under high B supply can draw the photosystems situation and the reactions to B toxic ity drawing the healthy status of the plants evalua ted. Although boron deficiency has been well investigate d, during recent years many researchers have also investigated boron toxicity effects, making progres s in the comprehension of boron transport within pl ants. This review represents the actual state of knowledg e concerning B toxicity.

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