ASSESSING DROUGHT TOLERANCE IN NATIONAL SMALL GRAINS COLLECTION (NSGC) ACCESSIONS
Small Grains and Potato Germplasm Research
2011 Annual Report
1a.Objectives (from AD-416)
The objective of this work is to assess drought tolerance in wheat accessions from the National Small Grains Collection, a problem of increasing importance in US wheat production.
1b.Approach (from AD-416)
Key accessions from the NSGC are being genotyped using DArT marker technology and SSR markers. These materials will be tested at the University of Idaho Research and Extension Center in Aberdeen for tolerance to drought. An association genetics approach will be taken to search for relationships between markers and drought tolerance. Data will be reported to the Germplasm Resources Information Network for dissemination to the plant breeding community.
The objective of this work is to assess drought tolerance in barley and wheat accessions from the National Small Grains Collection (NSGC), a problem of increasing importance in US wheat production. This project is using the core subset from the NSGC to represent the diversity of barley and wheat in the whole collection. To evaluate the water use efficiency for accessions we first increased seeds by planting them in a headrow test in the field in spring 2010. During seeds increase we took heading and height data and had all accessions tested for the presence of genes affecting height (Rht1 and Rht2) and photoperiod sensitivity (Ppd-D1) by a collaborating scientist. Based on these data we assembled two sets of barley accessions and three sets of wheat accessions with similar height and growth habit as follows: spring wheat (1200), winter wheat (600), spring barley (600), winter barley (600) (total 3,000). A total of 600 accessions will be evaluated each year in small yield plots in drip irrigation nurseries to evaluate water use efficiency, nitrogen (N) use efficiency, and yield under three regimes: irrigated-normal N, terminal drought – normal N, and terminal drought -low N (total 1800 plots per year, two blocks per treatment with 100 different accessions each) at Aberdeen, ID. Monitoring of the project is accomplished via frequent meetings and site visits. This agreement contributes to the parent project objective 2 goal of strategically evaluate accessions from the collection for resistance to important abiotic stresses.
Monitoring of the project is accomplished via frequent meetings and site visits.