Cytogenetic Identification and Molecular Marker Development of a Novel Wheat- 4Ns(4D) Alien Disomic Substitution Line with Resistance to Stripe Rust and Fusarium Head Blight

Overview

Journal Front Plant Sci

Date 2022 Nov 21

PMID 36407596

Authors

Xin Du

Xianbo Feng

Ruoxuan Li

YanLong Jin

Lihui Shang

Jixin Zhao

Changyou Wang

Tingdong Li

Chunhuan Chen

Zengrong Tian

Pingchuan Deng

Wanquan Ji

Affiliations

Soon will be listed here.

Abstract

(Trin.) Pilg. (2 = 4 = 28, NsNsXmXm) potentially harbours useful genes that might contribute to the improvement of wheat. We describe M862 as a novel wheat- alien disomic substitution line from a cross between wheat cv. 7182 and octoploid M47. Cytological observations indicate that M862 has a chromosome constitution of 2 = 42 = 21II. Two 4D chromosomes of wheat substituted by two Ns chromosomes were observed, using the GISH and ND-FISH analyses. Molecular marker, 55K SNP array and wheat- liquid array (GenoBaitsWheatplusPh) analyses further indicate that the alien chromosomes are 4Ns. Therefore, it was deduced that M862 was a wheat- 4Ns(4D) alien disomic substitution line. There were also changes in chromosomes 1A, 1D, 2B and 5A detected by ND-FISH analysis. Transcriptome sequencing showed that the structural variation of 1D, 1A and 5A may have smaller impact on gene expression than that for 2B. In addition, a total of 16 markers derived from Lm#4Ns were developed from transcriptome sequences, and these proved to be highly effective for tracking the introduced chromosome. M862 showed reduced height, larger grains (weight and width), and was highly resistance to CYR32 and CYR34 stripe rust races at the seedling stage and mixed stripe rust races (CYR32, CYR33 and CYR34) at the adult stage. It was also resistance to Fusarium head blight (FHB). This alien disomic substitution line M862 may be exploited as an important genetic material in the domestication of stipe rust and FHB resistance wheat varieties.

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