390-1 Using Canopy Spectral Reflectance for Mapping Drought Resistance from a Rye Chromosome Arm Introgression in Common Wheat.

See more from this Division: C01 Crop Breeding & Genetics
See more from this Session: Symposium--Addressing Grand Challenges - Nationally Coordinated Research in Wheat and Barley (TCAP)
Wednesday, November 5, 2014: 9:15 AM
Long Beach Convention Center, Seaside Ballroom B
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Tyson R. Howell1, Iago Hale2, Ljupcho Jankuloski3, Marcos Bonafede4 and Jorge Dubcovsky1, (1)University of California-Davis, Davis, CA
(2)University of New Hampshire-Durham, Durham, NH
(3)Faculty of Agricultural Sciences and Food, Skopje, Macedonia
(4)Instituto Nacional de Tecnología Agropecuaria (INTA), Buenos Aires, Argentina
The translocation of the short arm of rye (Secale cereale L.) chromosome one (1RS) onto wheat (Triticum aestivum L.) chromosome 1B (1RS·1BL) is used in wheat breeding programs worldwide due to its positive effect on yield, particularly under abiotic stress. Unfortunately, the translocation is also associated with several quality defects. To mitigate the negative effects of this translocation a derived 1RS line carrying proximal (P) and a distal (D) interstitial wheat segments (henceforth, 1RSWPD) was previously developed, which we introgressed into two genetic backgrounds. Canopy spectral reflectance (CSR) was used in conjunction with yield and physiological traits and showed that lines with the 1RS translocation had significantly higher yield and better canopy water status than the 1RSWPD NILs under both well watered and reduced irrigation conditions, indicating one or both of the regions are responsible for the difference in performance. We intercrossed the NILs and generated two additional NILs, carrying either the distal (1RSWD) or the proximal (1RSWP) wheat segment. Using CSR, we showed that the lines which contained rye chromatin in the distal region (1RS and 1RSWP) had better field performance than lines containing wheat chromatin in the distal segment (1RSWPD and 1RSWD). This result was confirmed in following field trials where yield and physiological traits were also measured. Results from physiological measurements suggest that the 1RS lines have increased access to stored soil moisture. We conclude that the distal region of the 1RS arm replaced in the 1RSWD genotype carries the beneficial allele(s) in both well watered and water stressed environments.
See more from this Division: C01 Crop Breeding & Genetics
See more from this Session: Symposium--Addressing Grand Challenges - Nationally Coordinated Research in Wheat and Barley (TCAP)
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