Open AccessThe wheat Sr22 , Sr33 , Sr35 and Sr45 genes confer resistance against stem rust in barley
Author(s) -
Hatta M. Asyraf Md,
Arora Sanu,
Ghosh Sreya,
Matny Oadi,
Smedley Mark A.,
Yu Guotai,
Chakraborty Soma,
Bhatt Dhara,
Xia Xiaodi,
Steuernagel Burkhard,
Richardson Terese,
Mago Rohit,
Lagudah Evans S.,
Patron Nicola J.,
Ayliffe Michael,
Rouse Matthew N.,
Harwood Wendy A.,
Periyannan Sambasivam,
Steffenson Brian J.,
Wulff Brande B.H.
Publication year - 2021
Publication title -
plant biotechnology journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.525
H-Index - 115
eISSN - 1467-7652
pISSN - 1467-7644
DOI - 10.1111/pbi.13460
Subject(s) - stem rust , biology , puccinia , gene , plant disease resistance , common wheat , hordeum vulgare , virulence , agrobacterium , genetically modified crops , transformation (genetics) , botany , poaceae , genetics , transgene , chromosome , mildew
In the last 20 years, stem rust caused by the fungus Puccinia graminis f. sp. tritici ( Pgt ), has re‐emerged as a major threat to wheat and barley production in Africa and Europe. In contrast to wheat with 60 designated stem rust ( Sr ) resistance genes, barley’s genetic variation for stem rust resistance is very narrow with only ten resistance genes genetically identified. Of these, only one complex locus consisting of three genes is effective against TTKSK, a widely virulent Pgt race of the Ug99 tribe which emerged in Uganda in 1999 and has since spread to much of East Africa and parts of the Middle East. The objective of this study was to assess the functionality, in barley, of cloned wheat Sr genes effective against race TTKSK. Sr22 , Sr33 , Sr35 and Sr45 were transformed into barley cv. Golden Promise using Agrobacterium ‐mediated transformation. All four genes were found to confer effective stem rust resistance. The barley transgenics remained susceptible to the barley leaf rust pathogen Puccinia hordei , indicating that the resistance conferred by these wheat Sr genes was specific for Pgt . Furthermore, these transgenic plants did not display significant adverse agronomic effects in the absence of disease. Cloned Sr genes from wheat are therefore a potential source of resistance against wheat stem rust in barley.