Tuesday, November 6, 2007
158-9

Relationship between Root Biomass and Water - Nitrogen Uptake and Grain Yield in 1RS Wheat.

J. Giles Waines1, Bahman Ehdaie1, Aaron Hoops1, Donald Merhaut1, Lee Jackson2, Kent Brittan3, Mick Canevari4, Brian Marsh3, Douglas Munier5, Jerry Schmierer3, Ron Vargas6, and Steve Wright7. (1) 900 University Ave., University of California-Riverside, University of California-Riverside, Botany & Plant Sciences, Riverside, CA 92521-0124, (2) University of California-Davis, Dept. of Plant Sciences, 1 Shields Ave. Univ. Of Ca, Davis, CA 95616-8515, (3) University of California Cooperative Extension, 70 Cottonwood Street, Woodland, CA 95695-2557, (4) C.E. University of California, San Joaquin Co., Stockton, CA CA 95205, (5) UC Cooperative Extension, P.O. Box 697, Orland, CA 95963, (6) C.E. University of California, Madera, CA 93637, (7) C.E. University of California, Tulare Co., Tulare, CA 93274

The project investigated the effect of root biomass and branching on water and nitrogen absorption, drainage and grain yield in bread wheat. Experiments in sand tubes confirmed rye 1RS translocation lines had larger root biomass than Pavon 76 wheat, which was significantly positively correlated with grain yield at low and high N levels. Root biomass was positively correlated with root, stem, grain and plant N content. The amount of solution absorbed during grain filling was positively correlated and amount of leachate negatively correlated with root biomass. Leachate N concentration was negatively correlated with root biomass. In field trials 1RS lines only effected yield increase in 50% of irrigated plots.

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Back to The ASA-CSSA-SSSA International Annual Meetings (November 4-8, 2007)