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United States Department of Agriculture (USDA) 2011

UNDERSTANDING THE GENETIC BASIS OF LOCAL ADAPTATION IN PERENNIAL GRASSES OF THE SONORAN DESERT

Genetic Grasses Sonoran

United States Department of Agriculture (USDA) Research, Education & Economics Information System (REEIS)

Titre : UNDERSTANDING THE GENETIC BASIS OF LOCAL ADAPTATION IN PERENNIAL GRASSES OF THE SONORAN DESERT

Identification : ARZT-1392510-M12-198

Pays : Etats Unis

Durée : Oct 1, 2011 à Sep 30, 2014

Domaine : sideoats grama ; bouteloua ; evolution ; rangeland plants ; drought ; adaptation

Partenaire : UNIVERSITY OF ARIZONA 888 N EUCLID AVE TUCSON,AZ 85719-4824

Objectifs
Assess the genetic basis for open-pollinated grain production in populations of sideoats grama (B. curtipendula var. caespitosa) in greenhouse experiments where genotypes are exposed to varying amounts of water stress

Descriptif
This research will be conducted using genotypes from two populations of sideoats grama from environments with different annual precipitation. One population originates in the Kofa Mountains in western Arizona where annual precipitation is estimated to be 217 mm. The other population exists on Table Top Mountain in central Arizona. Annual precipitation at this site is estimated to be 341 mm. These two populations were selected because one has evolved on a site (Kofa) where extreme drought may be expected to occur fairly regularly while the other represents a more typical precipitation regime for sideoats grama in central and southern Arizona. Using seed collected from these populations we will grow twenty randomly selected genotypes from each. These will be separated into ramets and these will be grown for use in greenhouse experiments to evaluate genetic variation in grain production under two levels of moisture application (treatments). One treatment will involve thorough irrigation every 1-3 days such that plants will likely never experience significant drought stress. The other treatment will include irrigation about every 5 days and will be scheduled based on the elicitation of drought stress symptoms (primarily changes in leaf morphology and color). Inflorescences will be regularly harvested from each genotype when mature and evaluated for spikelet, floret, and grain number. This will be conducted over at least three regrowth-flowering-defoliation cycles during the experimental period. Residual shoot biomass will be preserved

Présentation : USDA

Page publiée le 24 novembre 2015, mise à jour le 11 novembre 2017