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Genetics of durable resistance to leaf rust and stripe rust of an Indian wheat cultivar HD2009

100%

Khanna R., Bansal U. K., Saini R. G.

Journal of Applied Genetics

2005

vol. 46

issue 3

259-263

The Indian bread wheat cultivar HD2009 has maintained its partial resistance to leaf rust and stripe rust in India since its release in 1976. To examine the nature, number and mode of inheritance of its genes for partial leaf rust and stripe rust resistance, this cultivar was crossed with cultivar WL711, which is susceptible to leaf rust and stripe rust. The F1, F2, F3 and F5 generations from this cross were assessed separately for adult plant disease severity under artificial epidemic of race 77-5 of leaf rust and race 46S119 of stripe rust. Segregation for rust reaction in the F2, F3 and F5 generations indicated that resistance to each of these rust diseases is based on 2 genes, each with additive effects. Although the leaf rust resistance of HD2009 is similar in expression to that conferred by the gene Lr34, but unlike the wheats carrying this gene, cultivar HD2009 did not show leaf tip necrosis, a morphological marker believed to be tightly linked to the leaf rust resistance gene Lr34. Thus, the non-hypersensitive resistance of HD2009 was ascribed to genes other than Lr34.

Undescribed wheat gene for partial leaf rust and stripe rust resistance from Thatcher derivatives RL6058 and 90RN2491 carrying Lr34

88%

Agarwal S., Saini R. G.

Journal of Applied Genetics

2009

vol. 50

issue 3

199-204

Inheritance of partial leaf rust and stripe rust resistance of a Thatcher wheat 90RN2491, earlier reported to carry two doses of the gene pair Lr34-Yr18 and the reference line RL6058 (6*Thatcher/PI58548) for the Lr34-Yr18 gene pair was studied against predominant and highly virulent Indian races. Thatcher derivatives 90RN2491 and RL6058 were intercrossed as well as crossed with the leaf rust and stripe rust susceptible Indian cultivar WL711. The F1, F2 and F3 generations from these crosses were assessed for rust severity against leaf rust race 77-5 and stripe rust race 46S119. The F2 and F3 generations from the crosses of RL6058 and 90RN2491 with WL711, segregated 15 resistant : 1 susceptible (F2) and 7 homozygous resistant : 8 segregating : 1 homozygous susceptible (F3) ratios, respectively, both for leaf rust and stripe rust severity. Therefore, partial resistance against each of the leaf rust and stripe rust races in both RL6058 and 90RN2491 is ascribed to two independently inherited dominant genes. One of the two genes for leaf rust and stripe rust resistance in 90RN2491 and RL6058 is Lr34 and the linked gene Yr18, respectively. The second leaf rust resistance gene in both the Thatcher lines segregated independently of stripe rust resistance. Therefore, it is not Lr34 and it remains unidentified.

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2 Journal of Applied Genetics

1 2009

1 2005

2 Saini R. G.

1 Agarwal S.

1 Bansal U. K.

1 Khanna R.

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Genetics of durable resistance to leaf rust and stripe rust of an Indian wheat cultivar HD2009

Undescribed wheat gene for partial leaf rust and stripe rust resistance from Thatcher derivatives RL6058 and 90RN2491 carrying Lr34