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Addisu, M, Snape, J.W., Simmonds, J.R., Gooding, M.J. 2009. Reduced height (Rht) and photoperiod insensitivety (Ppd) allele associations with establishment and early growth of wheat in contrasting production

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Addisu, M., Snape, J.W., Simmonds, J.R., Gooding, M.J. 2009. Reduced height (Rht) and photoperiod insensitivity (Ppd) allele associations with establishment and early growth of wheat in contrasting production

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Cereal Research Communications
Authors: N. Zhang, R.Q. Pan, J.J. Liu, X.L. Zhang, Q.N. Su, F. Cui, C.H. Zhao, L.Q. Song, J. Ji, and J.M. Li

Plants with deficiency in Gibberellins (GAs) biosynthesis pathway are sensitive to exogenous GA3, while those with deficiency in GAs signaling pathway are insensitive to exogenous GA3. Thus, exogenous GA3 test is often used to verify whether the reduced height (Rht) gene is involved in GAs biosynthesis or signaling pathway. In the present study, we identified the genetic factors responsive to exogenous GA3 at the seedling stage of common wheat and analyzed the response of the plant height related quantitative trait loci (QTL) to GA3 to understand the GAs pathways the Rht participated in. Recombinant inbred lines derived from a cross between KN9204 and J411 with different response to exogenous GA3 were used to screen QTL for the sensitivity of coleoptile length (SCL) and the sensitivity of seedling plant height (SSPH) to exogenous GA3. Two additive QTL and two pairs of epistatic QTL for SCL were identified, meanwhile, two additive QTL and three pairs of epistatic QTL for SSPH were detected. For the adult plant height (PH) investigated in two environments, six additive QTL were identified. Three QTL qScl-4B, qSsph-4B and qPh-4B were mapped in one cluster near the functional marker Rht-B1b. When PH were conditional on SSPH, the absolute additive effect value of qPh-4B and qPh-6B were reduced, suggesting that the Rhts in both two QTL were insensitive to exogenous GA3, while the additive effect values of qPh-2B, qPh-3A, qPh-3D and qPh-5A were not significantly changed, indicating that the Rhts in these QTL were sensitive to exogenous GA3, or they were not expressed at the seedling stage.

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reduced height genes in autumn-sown Chinese wheats detected by molecular markers. Euphytica , 152 , 109–116. Xia X. Distribution of the Rht-B1b, Rht-D1b and Rht8 reduced height genes

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Rebetzke, G.J., Richards, R.A., Fischer, V.M., Mickelson, B.J. 1999. Breeding long coleoptile, reduced height wheats. Euphytica 106 :159–168. Mickelson B.J. Breeding long coleoptile

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., Law, C.N. 1993. Pleiotropic effects of genes for reduced height (Rht) and day-length insensitivity (Ppd) on yield and its components for wheat grown in middle Europe. Plant Breeding 111 :204–216. Law C

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.M. , Mickelson , B.J. 1999 . Breeding long coleoptile, reduced height wheats . Euphytica 106 : 159 – 168 . Rebetzke , G.J. , Richards , R.A. , Sirault , X.R.R. , Morrison

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