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Overexpression of phytoglobin in barley alters both compatible and incompatible interactions with the mildew pathogen Blumeria graminis
Author(s) -
Sørensen C. K.,
Carciofi M.,
HaslerSheetal H.,
Zafari S.,
Andrzejczak O.,
Hovmøller M. S.,
Møller I. M.,
Hebelstrup K. H.
Publication year - 2019
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/ppa.12931
Subject(s) - blumeria graminis , biology , pathogen , mildew , senescence , powdery mildew , virulence , inoculation , plant disease resistance , chlorosis , elicitor , botany , hordeum vulgare , microbiology and biotechnology , horticulture , poaceae , gene , genetics
This study showed how barley plants can be shifted in their response to isolates of the mildew pathogen Blumeria graminis with different host adaptation by overexpression of the barley phytoglobin gene HvHb1 . At early infection stages, plants overexpressing phytoglobin ( GPH b1) showed less papilla formation and more hypersensitive response against both virulent and avirulent pathogen isolates compared to the wildtype ( WT ) plants. The shift was most pronounced in a wheat‐adapted isolate ( B. graminis f. sp. tritici ). At later infection stages, GPH b1 plants infected with a virulent pathogen isolate (A6) showed less leaf chlorosis compared to the WT plants, indicating delayed senescence. The chlorophyll level was significantly higher in A6‐infected GPH b1 plants 9 days after inoculation (dai) and the senescence indicators sphingosine‐1‐phosphate:ceramide ratio and phytol content confirmed delayed senescence. At 14 dai the percentage of fungal DNA was significantly higher on the GPH b1 plants than on WT plants, probably as a result of the delayed senescence. The results show that overexpression of phytoglobin (previously known as plant haemoglobin) can be an important tool to understand disease‐related stress effects in plants of agronomic importance and for understanding basic resistance mechanisms. Studying this process in more detail may provide insights into how to alleviate stress‐related senescence in plants.