Physiological and genetic responses to boron deficiency inBrassica napus: A review

Abstract

Boron (B) is an essential microelement for the growth and development of plants, and B deficiency affects many biochemical and physiological processes. Brassica napus L. has a high demand for B and is extremely sensitive to B deficiency. Seed yields and oil quality of B. napus are often limited by the low availability of B in soils. Developing new cultivars of B. napus with high B efficiency is therefore required, which requires a greater understanding of responses to B deficiency. Significant genotypic differences in response to low soil B have been observed among varieties of B. napus. B-efficient genotypes can grow and yield normally and usually have a larger root system than B-inefficient genotypes at low B conditions. The mechanisms for B efficiency in B. napus are attributed to B absorption, transportation and utilization. In addition, the cell wall component plays an important role in the tolerance of B. napus to B deficiency, and the B-efficient line presents fewer B-binding sites in the cell walls compared with the B-inefficient line. Genetic and proteomic analyses in B. napus revealed the modulation of a complex network in response to B deficiency. This review gives a comparative overview of the physiological and genetic responses to B deficiency in B. napus and discusses the possible underlying mechanisms of B efficiency.

The Levels of Boron‐Uptake Proteins in Roots are Correlated with Tolerance to Boron Stress in Barley

“…In contrast to most past studies, we observed no significant difference (Nable, 1988;Hayes and Reid, 2004;Roessner et al, 2006;Nable et al, 1990). Genotypic differences in response to low B availability have also been observed among Brassica napus L. varieties, wherein B-efficient genotypes with larger root systems can grow and yield normally as compared with intolerant genotypes (Zhang et al, 2014). Genotypic differences in response to low B availability have also been observed among Brassica napus L. varieties, wherein B-efficient genotypes with larger root systems can grow and yield normally as compared with intolerant genotypes (Zhang et al, 2014).…”

Boron demanding tissues of Brassica napus express specific sets of functional Nodulin26‐like Intrinsic Proteins and BOR1 transporters

“…Brassica napus cv. Qingyou10 ( Q10 ) and Westar10 ( W10 ) are B‐efficient and B‐inefficient cultivars, respectively, and served to study physiological, molecular and genetic factors influencing B efficiency (Zhao et al ., ; Yang et al ., ; Zhang et al ., ,b, ; Yuan et al ., ; Zhou et al ., ).…”

“…Based on sequence and expression analyses, BnaA03.NIP5;1b was subsequently suggested to be the responsible gene in the B efficiency loci of cv. Q10 (Xu et al ., , ; Zhao et al ., , ; Zhang et al ., ,b; Hua et al ., ,b). However, neither BnaA03.NIP5;1b nor BnaC02.NIP5;1a have been tested for their B permeability, although it is known that even highly homologous NIPs can possess different substrate selectivities (Zhao et al ., ; Mitani‐Ueno et al ., ).…”

Response of the plant hormone network to boron deficiency

“…Hence, this response is in contrast to many other nutrient deficiencies, which either induce a shift in the shootto-root biomass ratio, such as under N, P, Mg or K deficiency, or strongly impair photosynthesis causing growth suppression indirectly via hampered assimilate provision (Hermans et al, 2006). Boron deficiency is of particular importance in Brassica species, which are highly sensitive to B deficiency (Bergmann, 1992;Herrera-Rodriguez et al, 2010;Zhang et al, 2014). In the present study, we employed rapeseed to determine which PH species change in association with the B nutritional status and are involved in B-dependent growth responses.…”