Physiological and genetic responses to boron deficiency in Brassica napus: A review

Figures & data

Figure 1 Response of boron (B)-efficient and B-inefficient lines of Brassica napus L. to B stress. (a) seed setting at low B; (b) shoot growth at low B (0.25 μM); (c) root growth at normal B (+B; 25 μM) and low B (–B; 0.25 μM). HS5: Huashuang 5, QY10; Qingyou 10, B: Bakow, W: Westar 10, HY18: Huyou 18, HY16, Huyou 16.

Figure 2 Glycosyl compositions of boron (B)-efficient line, Qingyou 10, and B-inefficient line, Westar 10, under normal and low-B conditions. Gal: Galactose, Ara: Arabinose, GalA: Galacturonic acid, Xyl: Xylose, Rha: Rhamnose, GlcA: Glucuronic Acid, Fuc: Fucose, Man: Mannose. Source: Pan et al. (2012).

Table 1 Distribution of boron (B) in B-efficient line Qingyou 10 and B-inefficient line Westar 10 under low-B conditions

	Third and neonatal fourth leaf		Second leaf		First leaf		Root
	Qingyou 10	Westar 10	Qingyou 10	Westar 10	Qingyou 10	Westar 10	Qingyou 10	Westar 10
Pectin B (μg g^–1 cell wall DW)	6.09	3.76	3.78	2.43	5.81	1.87	7.59	6.94
Cell wall B (μg g^–1 plant DW)	7.42	4.95	4.41	3.04	6.83	2.01	9.15	9.08
Total plant B	8.63	5.6	8.6	5.08	9.99	2.57	11.74	10.2
Pectin B/cell wall W	82.23	75.95	85.63	80.45	84.8	93.71	83.01	76.43
Cell wall B/plant B	85.91	88.4	51.26	59.83	68.34	78.21	77.98	89.04

DW, dry weight. Source: Pan et al. (2012).

Figure 3 QTLs for boron (B) efficiency related traits detected at Brassica napus L. seedling stage (left) and maturity stage (right). IPRL: increment of primary root length, SDW: shoot dry weight, RDW: root dry weight, R/S: ratio of RDW to SDW, SBA: shoot boron accumulation, RBA: root B accumulation, (R/S) BA: the ratio of RBA to SBA, BEC: boron efficiency coefficient, SY: seed yield, PH: plant height, BN: branch number, PN: pod number, SN: seed number, SW: seed weight, QTL; quantitative trait locus, TN DH population, derived from the cross between Tapidor and Ningyou 7; BQ DH population, derived from the cross between Qingyou 10 and Bakow.

Pan Y, Wang ZH, Yang L, Wang ZF, Shi L, Naran R, Azadi P, Xu FS 2012: Differences in cell wall components and allocation of boron to cell walls confer variations in sensitivities of Brassica napus cultivars to boron deficiency. Plant Soil, 354, 383–394. doi:10.1007/s11104-011-1074-6

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