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Australasian Plant Pathology : Volume 36

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Nitrogen utilisation efficiency and grain yield components of rice varieties grown under blast disease stress

Content Provider	Springer Nature Link
Author	Koutroubas, S. D. Katsantonis, D. Ntanos, D. A. Lupotto, E.
Copyright Year	2008
Abstract	The aim of this study was to analyse the relative importance of traits causing variation in grain yield and nitrogen utilisation efficiency (NUE) among rice (Oryza sativa L.) varieties grown under blast disease (Pyricularia oryzae Cav.). Four rice varieties with various levels of susceptibility to blast disease were grown in field experiments in 2003 and 2004. Plants were grown under high and low disease pressure, achieved by early inoculation with the blast fungus and by natural infection, respectively. Inoculation with the fungus reduced the grain weight compared with naturally infected plants. The magnitude of this reduction was proportional to disease severity. Grain nitrogen (N) concentration was higher in the inoculated plants. Increased grain N concentration resulted in a reduction of its contribution towards grain N yield variation. Inoculation reduced the NUE for biomass production (NUE$_{b}$) and the NUE for grain yield (NUE$_{g}$). NUE$_{b}$ was negatively correlated with leaf blast rating, suggesting that the higher disease pressure was on leaves, the lower the biomass productionwas perNunit.Nharvest index accounted for almost all the variation in NUE$_{g}$ among varieties in the inoculated plants. Results indicated that the higher dilution of N by dry matter in the non-inoculated plants was responsible for the higher NUE$_{g}$ compared with the inoculated plants.
Starting Page	53
Ending Page	59
Page Count	7
File Format	PDF
ISSN	08153191
Journal	Australasian Plant Pathology
Volume Number	37
Issue Number	1
e-ISSN	14486032
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-01-01
Publisher Institution	Australasian Plant Pathology Society
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plant Pathology Plant Sciences Agriculture Entomology Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science

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