Identification and Validation of a Major Quantitative Trait Locus for Adult Plant Resistance Against Leaf Rust From the Chinese Wheat Landrace Bai Qimai

Abstract

Leaf rust caused by Puccinia triticina Eriks. (Pt) is a common disease of wheat worldwide. The Chinese wheat landrace Bai Qimai (BQM) has shown high resistance to leaf rust for a prolonged period of time; the infected leaves of BQM displayed high infection types (ITs), but they showed low disease severities at the adult plant stage. To find quantitative trait loci (QTL) for resistance to leaf rust, 186 recombinant inbred lines from the cross Nugaines × BQM were phenotyped for leaf rust response in multiple field environments under natural Pt infections and genotyped using the 90K wheat single nucleotide polymorphism (SNP) chip and simple sequence repeat (SSR) markers. A total of 2,397 polymorphic markers were used for QTL mapping, and a novel major QTL (QLr.cau-6DL) was detected on chromosome 6DL from BQM. The effectiveness of QLr.cau-6DL was validated using the three additional wheat populations (RL6058 × BQM, Aikang58 × BQM, and Jimai22 × BQM). QLr.cau-6DL could significantly reduce leaf rust severities across all tested environments and different genetic backgrounds, and its resistance was more effective than that of Lr34. Moreover, QLr.cau-6DL acted synergistically with Lr34 to confer strong resistance to leaf rust. We believe that QLr.cau-6DL should have high potential value in the breeding of wheat cultivars with leaf rust resistance.

Genetics of Resistance to Leaf Rust in Wheat: An Overview in a Genome-Wide Level

“…The Chinese wheat landrace 'Bai Qimai' showed a slow rusting phenotype at the adult plant stage, and a major QTL QLr.cau-6DL on chromosome 6DL was recently identified using 90K SNP chip and SSR markers [139]. The A. intermedium-derived Lr38 on chromosome 6DL provided a stable seedling and APR to multiple Pt pathotypes [140].…”

Genetics of Resistance to Leaf Rust in Wheat: An Overview in A Genome-Wide Level

“…The Chinese wheat landrace "Bai Qimai" showed a slow rusting phenotype at the adult plant stage, and a major QTL QLr.cau-6DL chromosome 6DL was recently identified using 90K SNP chip and SSR markers [139]. The Agropyron intermedium-derived Lr38 on chromosome 6DL provided a stable seedling and APR to multiple Pt pathotypes [140].…”

Detection method of wheat rust based on transfer learning and sharpness‐aware minimization

“…When the disease occurs, it can reduce the yield of wheat by 5%–15% in general, and more than 50% in severe cases (Gao et al, 2019; Hewitt et al, 2021). In China, more than 15 million hectares of wheat are affected annually (Hu et al, 2020; Wang et al, 2022). Therefore, to ensure adequate wheat yield, it is necessary to detect the disease at an early stage and take corresponding measures in a timely manner.…”

“…When the disease occurs, it can reduce the yield of wheat by 5%-15% in general, and more than 50% in severe cases (Gao et al, 2019;Hewitt et al, 2021). In China, more than 15 million hectares of wheat are affected annually (Hu et al, 2020;Wang et al, 2022). Therefore, to ensure adequate wheat yield, it is necessary to detect the disease at an early stage and take corresponding measures in a timely manner.In recent years, with the development of automation, artificial intelligence and drone (also known as unmanned aerial vehicles, UAVs) technologies, more advanced unmanned means are available for the detection of crop diseases, gradually changing our approach to the…”