Exploring Durable Genetic Resistance against Leaf Rust through Phenotypic Characterization and Lr34Linked STS Marker in Wheat Germplasm

  • Qaisar Khan Department of Biotechnology, Quaid-i-Azam University, Islamabad-45320, Pakistan
  • Abdul Samad Mumtaz
  • Haris Khurshid
  • Sohail Ahmad Jan
  • Nazir Ahmad
  • Shahid Ali Khan
  • Noor Saleem
  • Sabir Hussain Shah
  • Muhamad Ishaq Ibrahim
  • Muhammad Ilyas
  • Muhammad Arif
Keywords: Adult Plant Resistance, AUDPC, Cultivars, Marker Assisted Selection, Wheat rust

Abstract

Present study was aimed to screening the population of 25 wheat genotypes from Baluchistan region of Pakistan along with five commercial cultivars for leaf rust adult plant resistance (APR) through gene postulation using natural inoculation of Puccinia triticina Erikss local pathotype. Infection severity was recorded on scale in comparison with susceptible control "Morroco" cultivar. On the basis of phenotypic score, seven accessions and four varieties (Zardana-89, Sariab-92, Zarlashta-99 and Raskoh-05) with AUDPC values up to 20% were characterized as resistant genotypes. Coefficient of infection (CI) score ranged from 0-10 for some accessions and cultivars showing high level of adult plant resistance. Furthermore, bi-allelic STS marker csLV34 having close linkage with Lr34 (0.4cM). This marker amplified one gene specific allele of 150bp in 21 genotypes, including 19 accessions and two commercial varieties (Sariab-92 and Zarghoon-79) which confirmed presence of Lr34 gene conferring adult plant resistance against leaf rust. The rust pathogenicity scale varied for accessions from resistant to moderately susceptible. However, beside Lr34, phenotypic gene postulation, in combination with marker assisted selection for leaf rust resistance, has revealed presence of some other unknown resistance genes in local wheat germplasm which signified its use in wheat improvement programs both locally and abroad.

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Published
2016-07-08
How to Cite
Khan, Q., Mumtaz, A. S., Khurshid, H., Jan, S. A., Ahmad, N., Khan, S. A., Saleem, N., Shah, S. H., Ibrahim, M. I., Ilyas, M., & Arif, M. (2016). Exploring Durable Genetic Resistance against Leaf Rust through Phenotypic Characterization and Lr34Linked STS Marker in Wheat Germplasm . Bioscience Journal, 32(4). https://doi.org/10.14393/BJ-v32n4a2016-34046
Section
Agricultural Sciences