QTL Mapping and QTL×Environmental Interactions for Plant Height in Wheat

doi:10.7668/hbnxb.2015.05.014

Abstract

Abstract: Known better the molecular quantitative genetic and QTL interactions with water environments of plant height(PH)in wheat,QTL mapping was performed for PH by a mixed linear model approach.The PH was evaluated by the population of 120 recombinant inbred lines derived from a cross between drought-tolerant cultivar Longjian 19 and water-sensitive cultivar Q9086 under different water regimes in four environments.Phenotypes of PH from RILs were significantly sensitive to water conditions and showed wide variations and transgressive segregations.The inheritance of PH was substantially modulated by minor-effect polygenes and their interactions with water environments.19 additive QTLs(A-QTLs)and 45 epistatic QTLs(AA-QTLs)for PH were identified and widely distributed on all chromosomes besides 3D.The expression of these QTLs might influence the phenotypic variation of PH by the up-and down-regulation,accounted for variations of PH by 0.47%-7.14% and 0.34%-2.93%,respectively.Two A-QTLs, Qph. acs-5A. 1 and Qph. acs-7A. 1,could be detected in multi-environments.In addition,two A-QTL hot-spot regions for PH were also found in some specific intervals,e.g.,Xbarc1072-XBarc167 on chromosome 2B and Xksum253-Xbarc164 on chromosome 5B.Most of interaction effects of A-QTLs and AA-QTLs with drought-stressed environments showed the down-regulation for the PH variations.The additive and the epistatic effect could be main genetic factors controlled the PH inheritance,which expressions might decrease PH.The information in this study should be useful for the genetic improvement of drought tolerance and molecular marker-assisted selection in wheat.

Key words: Wheat, Drought stress, Plant height, QTL mapping, Environmental interaction

CLC Number:

S512.03

YE Ya-qiong, LI Meng-fei, LIU Yuan, CHEN Jing-jing, YANG De-long, HU Liang-liang, LÜ Ting-ting, JIAO Dong-li, CHAI Shou-xi. QTL Mapping and QTL×Environmental Interactions for Plant Height in Wheat[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2015, 30(5): 83-91. doi: 10.7668/hbnxb.2015.05.014.

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