Effect of boron deficiency stress on boron efficiency,accumulation and distribution in different Vitis genotypes

【Objective】The aim of the study was to evaluate boron efficiency of different Vitis genotypes under boron deficiency stress and reveal the mechanism of boron efficiency.【Method】Nutrient solution experiments were conducted to investigate the effect of boron deficiency stress on growth and boron accumulation,distribution in four grape species(seven grape genotypes).【Result】Vitis heyneana clone‘Huaxi-9',‘Huaxi-4'and V. flexuosa clone‘Xishui-4'were high boron efficiency genotypes,and V. heyneana clone‘Fuquan-1'and‘Nongyuan-11',V. vinifera cultivar‘Red globe',‘Crystal'(hybrid of V. viniferra×V. labrusca)were low boron efficiency genotypes. Inhibition of boron deficiency stress on the shoot and root growth of high boron efficiency genotypes were less than that of low boron efficiency genotypes. Boron deficiency treatment reduced the boron content and accumulation of different genotypes grapes. The boron content in root and stem of high boron efficiency genotype‘Huaxi-9'was 97.89% and 95.28% of control respectively,and the decrease of boron accumulation in total plant was less than 50%,however,the boron content in low boron efficiency genotype‘Fuquan-1'was only 51.38% and 66.66% of control,and the decrease of boron accumulation in total plant was more than 50%. Under the stress of boron deficiency,boron redistribution ability in the root and stem of high boron efficiency genotypes ‘(Huaxi-9',‘Huaxi-4'and‘Xishui-4') was stronger than that in low boron efficiency genotypes ‘(Fuquan-1',‘Red globe'and‘Crystal'). In addition,boron efficiency of different genotype grapes was closely related to the biomass and root characteristics of grapes.【Conclusion】Boron efficiency of wild grape species which are originated in Guizhou Karst mountains was higher than that of V. Vinifera and V. viniferra × V. labrusca,but there was difference within the wild grape species. The inhibitory effect of boron stress on high boron efficiency genotypes was less than that on low boron efficiency genotypes,and boron efficiency differences between different genotypes depend on the ability of mobility and redistribution of boron in plants.