Gibberellin Sensitivity of the Rht Genes in Tetraploid Wheat and Effects on Agronomic Traits

doi:10.7668/hbnxb.2015.02.024

Abstract

Abstract: Understanding the gibberellin sensitivity of the Rht genes Rht14, Rht16 and Rht18 in tetraploid wheat and the effects on agronomic traits are crucial for the proper utilization of these Rht genes in yield improvement of wheat.Five cultivars, namely, the tetraploid wheat near isogenic lines of ANW16D, ANW16F and ANW16G which contains Rht14, Rht16 and Rht18 gene, respectively, the recurrent parent LD222 and hexaploid wheat Chinese spring were served as materials in present studies.The heights of five cultivars before and after GA₃treatment were measured respectively to study the gibberellin response type.At the mature period, some main agronomic traits, such as plant height, main spike length, the first internode length under main spike, internode of epidermal cells, grain epidermal cells and grain volume were measured to acquaint the effects of Rht14, Rht16 and Rht18 on them.Results indicated that ANW16D, ANW16F and ANW16G were GA-sensitive, and their sensitivity order was Chinese spring-4 mol/L GA₃ was the best concentration level to spray with dwarf cultivars, which can restore the plant height to the normal control LD222's height.Analysis of these agronomic traits showed that the most essential reason that Rht14, Rht16 and Rht18 reduced plant height was shortening the first internode epidermal cell length, and the reducing effect order was Rht18 < Rht16 < Rht14.But the three Rht genes did not affect the seed size while minimizing the height.

Key words: Tetraploid wheat, Rht genes, Agronomic traits, Gibberellin sensitivity

CLC Number:

S512.03

WANG Qing-hai, YANG Zai-jun, WEI Shu-hong, LIAO Ming-li, SU Jin, YANG Yu-feng, YANG Hui, WANG Yu-wei, PENG Zheng-song. Gibberellin Sensitivity of the Rht Genes in Tetraploid Wheat and Effects on Agronomic Traits[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2015, 30(2): 132-139. doi: 10.7668/hbnxb.2015.02.024.

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