QTL mapping of grain arabinoxylan contents in common wheat using a recombinant inbred line population
2016
Yang, Li | Zhao, Dehui | Yan, Jun | Zhang, Yelun | Xia, Xianchun | Tian, Yubing | He, Zhonghu | Zhang, Yong
Arabinoxylans (AX) are major polymers of wheat grain cell walls and affect the end-use properties and nutritional quality. Total (TOT-AX), water-unextractable (WU-AX), and water-extractable (WE-AX) AX contents were determined in grain of 240 recombinant inbred wheat lines (RILs), derived from the cross PH82-2/Neixiang 188. A total of 195 SSR and STS markers were used to construct a genetic map and to detect quantitative trait loci (QTL). Wide ranges of variation in TOT-AX, WU-AX, and WE-AX contents were observed among the RILs, with line effects contributing the largest phenotypic variation. Broad sense heritabilities (h ²) were 0.50, 0.38 and 0.71, respectively. Inclusive composite interval mapping (ICIM) identified four additive QTL for TOT-AX content on chromosomes 1B, 1D, 3B and 5B, explaining 3.7–14.6 % of the phenotypic variance (PV), among which two were involved in significant additive × season interactions, contributing 0.5–2.4 % of the PV. Two additive QTL for WU-AX content were identified on chromosomes 1B and 1D, accounting for 6.4 and 8.6 % of the PV, respectively; both were involved in significant additive × season interactions, contributing 0.6–1.4 % of the PV. Nine additive QTL for WE-AX content were identified on chromosomes 1A, 1B, 2B, 3B, 5A, 5B, 6B, 7A and 7B, explaining 3.8–15.2 % of the PV, and three of them were involved in significant additive × season interactions, contributing 0.5–2.1 % of the PV. Two pairs of epistatic QTL, with significant epistatic × season interactions, were identified for TOT-AX and WU-AX contents, contributing 16.6 and 18.6 % of the PV, respectively. The QTL identified on chromosomes 1B (associated with rye secalin marker sec1), 5A, 5B and 7A showed stable effects on WE-AX content across seasons.
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