Seedling and adult plant resistance to leaf rust in some Egyptian wheat genotypes

Abstract

Leaf rust of wheat caused by Puccinia triticina Eriks. is one of the most widespread disease under Egyptian conditions. In the course of this study, thirteen Egyptian wheat genotypes were evaluated to leaf rust resistance at seedling stage under greenhouse condition and adult plant stage under field conditions. Over three growing seasons i.e. 2011/12, 2012/13 and 2013/14 and three locations i.e. Itay El-Baroud and Nubariya Agricultural Research Stations as well as the Farm of the Faculty of Agriculture, Minufiya University, Shibin El-Kom. The tested wheat genotypes were classified according their resistance into three groups. The first group, race-specific resistant genotypes which include Shandweel 1, Misr 1, Misr 2, Sids 12 and Sids 13, they showed the lowest values of final rust severity (FRS) and area under disease progress curve (AUDPC). The second group, slow-rusting or partially resistant genotypes which include Sakha 94, Gemmeiza 9, Giza 168, Sakha 95, Gemmeiza 10 and Gemmeiza 11, they displayed low level of FRS and AUDPC. The third one includes Gemmeiza 7 and Sids 1, which has the highly susceptible or fast rusting ones, they showed the highest values of FRS and AUDPC. Postulation of leaf rust resistance genes was differed between the tested genotypes. Results indicated that Sakha 95 and Sids 12 may have seven resistance genes. Moreover, Gemmeiza 10 may have five genes and Misr 1 may have three genes. While, Giza 168, Sids 1, Misr 2 and Shandweel 1 may have two genes. The wheat genotypes Gemmeiza 11 and Gemmeiza 12 may have only single gene. Also, all the tested wheat genotypes may be containing some additional genes. Meanwhile, the wheat genotype Sakha 94, Gemmeiza 7, Gemmeiza 9 and Sids 13 did not have any of the tested genes.