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Boron (B) is an essential micronutrient of plants. In the present study, we characterized an  Arabidopsis  mutant  lbt  with significant  l ow -b oron  t olerance that was identified based on our previous mapping of QTL for B efficiency in  Arabidopsis . Multiple nutrient-deficiency analyses point out that  lbt  mutant is insensitive to only B-limitation stress. Compared with wild-type Col-0, the fresh weight, leaf area, root length and root elongation rate of  lbt  mutant were significantly improved under B deficiency during vegetative growth.  lbt  mutant also showed the improvements in plant height, branches and inflorescences compared with Col-0 during the reproductive stage under B limitation. Ultrastructure analysis of the leaves showed that starch accumulation in  lbt  mutant was significantly diminished compared with Col-0. Furthermore, there were no significant differences in the expression of transporter-related genes and B concentrations between Col-0 and  lbt  mutant under both normal B and low-B conditions. These results suggest that  lbt  mutant has a lower B demand than Col-0. Genetic analysis suggests that the low-B tolerant phenotype of  lbt  mutant is under the control of a monogenic recessive gene. Based on the high-density SNP linkage genetic map, only one QTL for low-B tolerance was mapped on chromosome 4 between 10.4 and 14.8 Mb. No any reported B-relative genes exist in the QTL interval, suggesting that a gene with unknown function controls the tolerance of  lbt  to B limitation. Taken together,  lbt  is a low-B tolerant mutant that does not depend on the uptake or transport of B and is controlled by a monogenic recessive gene mapped on chromosome 4, and cloning and functional analysis of  LBT  gene are expected to reveal novel mechanisms for plant resistance to B deficiency.

Identification and Characterization of an Arabidopsis thaliana Mutant lbt With High Tolerance to Boron Deficiency