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CO2-assimilation and chlorophyll fluorescence as indirect selection criteria for host tolerance against Striga

CO2-assimilation and chlorophyll fluorescence as indirect selection criteria for host tolerance against Striga

Rodenburg, Jonne ORCID: 0000-0001-9059-9253, Bastiaans, Lammert, Schapendonk, Ad. H. C. M., van der Putten, Peter E. L., van Ast, Aad, Dingemanse, Niels J. and Haussmann, Bettina I. G. (2007) CO2-assimilation and chlorophyll fluorescence as indirect selection criteria for host tolerance against Striga. Euphytica, 160 (1). pp. 75-87. ISSN 0014-2336 (Print), 1573-5060 (Online) (doi:https://doi.org/10.1007/s10681-007-9555-7)

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Abstract

Striga hermonthica (Del.) Benth. is a parasitic weed on tropical cereals causing serious yield losses in Africa. The use of host crop varieties with improved resistance and tolerance against this parasite is a key component of an integrated control strategy. Breeding for tolerance is however seriously hampered by the absence of reliable and yet practical selection measures. The observation that the photosynthetic rate of tolerant genotypes is less sensitive to Striga infection was used as a starting point to search for suitable selection measures. In a greenhouse pot experiment the effect of Striga infection on the photosynthesis of four sorghum (Sorghum bicolor [L.] Moench) genotypes, differing in Striga tolerance level, was measured at three moments in time (26, 48 and 75 days after sowing). Genotypes were CK60-B, E36-1, Framida and Tiémarifing. Measurements involved CO2-assimilation (A) and three chlorophyll fluorescence characteristics (electron transport rate through photosystem II [ETR], photochemical [Pq] and non-photochemical quenching [NPq]). Striga infection negatively affected A, ETR and Pq. Based on A and Pq, genotypes with superior levels of tolerance (Tiémarifing) could be discriminated from genotypes with superior level of resistance (Framida). Both A and Pq showed high heritabilities and consequently clear and predictable differences between genotypes. Using discriminative ability, heritability and cost effectiveness as main criteria, photochemical quenching (Pq) was concluded to possess the highest potential to serve as indirect selection measure for host plant tolerance to Striga. Screening should preferably be conducted at relatively high Striga infestation levels, between Striga emergence and host plant flowering

Item Type: Article
Uncontrolled Keywords: Striga, photosynthesis, chlorophyll fluorescence, selection, sorghum
Subjects: S Agriculture > S Agriculture (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Natural Resources Institute
Faculty of Engineering & Science > Natural Resources Institute > Agriculture, Health & Environment Department
Faculty of Engineering & Science > Natural Resources Institute > Ecosystem Services Research Group
Last Modified: 20 Feb 2019 12:27
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/19068

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