Plant height affects Fusarium crown rot severity in wheat

Liu, Y.X., Yang, X.M., Ma, J., Wei, Y.M., Zheng, Y.L., Ma, H.X., Yao, J.B., Yan, G.J., Wang, Y-G., Manners, J.M., & Liu, C.J. (2010) Plant height affects Fusarium crown rot severity in wheat. Phytopathology, 100(12), pp. 1276-1281.

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Abstract

Effects of plant height on Fusarium crown rot (FCR) disease severity were investigated using 12 pairs of near-isogenic lines (NILs) for six different reduced height (Rht) genes in wheat. The dwarf isolines all gave better FCR resistance when compared with their respective tall counterparts, although the Rht genes involved in these NILs are located on several different chromosomes. Treating plants with exogenous gibberellin increased FCR severity as well as seedling lengths in all of the isolines tested. Analysis of the expression of several defense genes with known correlation with resistance to FCR pathogens between the Rht isolines following FCR inoculation indicated that the better resistance of the dwarf isolines was not due to enhanced defense gene induction. These results suggested that the difference in FCR severity between the tall and dwarf isolines is likely due to their height difference per se or to some physiological and structural consequences of reduced height. Thus, caution should be taken when considering to exploit any FCR locus located near a height gene.

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ID Code: 90447
Item Type: Journal Article
Refereed: Yes
Keywords: Fusarium pseudogramincarum, coleoptile triticum vulgare, dwarfing genes, indolyl-3-acetic acid, gibberellic-acid, cell dimensions, growth-response, bread wheat, aestivum l., disease, pseudograminearum
DOI: 10.1094/phyto-05-10-0142
ISSN: 0031-949X
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2010 The American Phytopathological Society
Deposited On: 17 Nov 2015 04:12
Last Modified: 10 Dec 2015 04:12

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