Inheritance of leaf rust resistance in four popular Indian durum wheat cultivars
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RESEARCH ARTICLE
Inheritance of leaf rust resistance in four popular Indian durum wheat cultivars A. Divya1 · T. L. Prakasha1 · A. N. Mishra1 · S. Chand2 · K. S. Solanki1 · Pramod Prasad3 · S. V. Sai Prasad1 Received: 26 April 2020 / Revised: 19 August 2020 / Accepted: 28 August 2020 © Indian Phytopathological Society 2020
Abstract Leaf rust is the one of the most important biotic stresses affecting world wheat production because of its wide distribution. In a study conducted to understand the inheritance of leaf rust resistance genes present in the popular durum wheat cultivars viz. HI 8498, HI 8663, HI 8713 and HI 8737 indicated that a single dominant gene each controls resistance to two Puccinia triticina (Pt) pathotypes 162-2 (93R39) and 104-2 (21R55). The allelic tests indicated that three diverse genes control resistance to Pt pathotype 104-2, with the gene being common between HI 8713 and HI 8737. Resistance to pathotype 162-2 was controlled by two diverse genes among the four test cultivars as the same gene conditioned resistance in HI 8737, HI 8713 and HI 8663 with the resistance gene in HI 8498 being different. The infection types of the two Pt pathotypes on the test cultivars were found to be higher than that of near isogenic lines carrying Lr3, Lr14a and Lr23 indicating that the identified genes in the present study were different from these commonly postulated Lr genes in Indian durum germplasm. The identified leaf rust resistance genes in the study will contribute to the diversity of leaf rust resistance in durum wheat and can be well utilized in breeding programmes. Keywords Durum wheat · Leaf rust · Resistance · Inheritance · Diversity
Introduction Durum wheat (Triticum turgidum ssp. durum L.) is the second most important wheat species, occupying nearly 10% of the wheat area in India, predominantly cultivated in central and peninsular zones with more than 2.5 million tons of annual production. Due to differences among the rust resistance spectrum of durum wheat and bread wheat, simultaneous cultivation of both the wheat species can diversify the rust resistance base there by limiting the build up and recurrence of wheat rust epidemics. The wheat leaf rust caused by Puccinia triticina Erikss. (Pt) is the most common, causing low to higher yield losses (7–80%) depending upon the stage of plant it attacks (Agnieszka et al. 2019). The pathogen * A. Divya [email protected] 1
ICAR-Indian Agricultural Research Institute, Regional Station, Indore, M.P, India
2
Devi Ahilya Vishwavidyalaya, Takshashila Campus, Indore, M.P, India
3
ICAR-Indian Institute of Wheat and Barley Research, Regional Station, Shimla, India
mostly infects leaf blades, although it could infect the leaf sheath and glumes under high disease inoculum among highly susceptible cultivars. To cope up with emergence of new virulences of leaf rust and their management, continuous monitoring of pathotypes, identification of rust resistance genes within the available germplasm, land races and allied species and development
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