AUTHOR=Navathe Sudhir , He Xinyao , Kamble Umesh , Kumar Manjeet , Patial Madhu , Singh Gyanendra , Singh Gyanendra Pratap , Joshi Arun Kumar , Singh Pawan Kumar 

TITLE=Assessment of Indian wheat germplasm for Septoria nodorum blotch and tan spot reveals new QTLs conferring resistance along with recessive alleles of Tsn1 and Snn3

JOURNAL=Frontiers in Plant Science

VOLUME=14

YEAR=2023

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2023.1223959

DOI=10.3389/fpls.2023.1223959

ISSN=1664-462X

ABSTRACT=<p>The leaf blight diseases, Septoria nodorum blotch (SNB), and tan spot (TS) are emerging due to changing climatic conditions in the northern parts of India. We screened 296 bread wheat cultivars released in India over the past 20 years for seedling resistance against SNB (three experiments) and TS (two experiments). According to a genome-wide association study, six QTLs on chromosome arms 1BL, 2AS, 5BL, and 6BL were particularly significant for SNB across all three years, of which <italic>Q.CIM.snb.1BL, Q.CIM.snb.2AS1</italic>, <italic>Q.CIM.snb.2AS.2, and Q.CIM.snb.6BL</italic> appeared novel. In contrast, those on 5BS and 5BL may correspond to <italic>Snn3</italic> and <italic>Tsn1</italic>, respectively. The allelic combination of <italic>tsn1</italic>/<italic>snn3</italic> conferred resistance to SNB, whereas that of <italic>Tsn1</italic>/<italic>Snn3</italic> conferred high susceptibility. As for TS, <italic>Tsn1</italic> was the only stably significant locus identified in this panel. Several varieties like PBW 771, DBW 277, and HD 3319, were identified as highly resistant to both diseases that can be used in future wheat improvement programs as resistant donors.</p>