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Annual Progress Report on Malting Barley Research March, 2007

Annual Progress Report on Malting Barley Research March, 2007

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2. Other <strong>Research</strong><br />

(A) Predicting Seed Storage Viability with Accelerated Aging: Widespread<br />

occurrence of pre-harvest sprouting in 2002 raised c<strong>on</strong>cern over the storage viability of<br />

sprouted grain. We found that while severely sprouted samples rapidly lost viability in<br />

storage, comm<strong>on</strong> measures of sprouting were not good overall predictors (r≤0.50) of<br />

germinati<strong>on</strong> following storage for 4 and 7 m<strong>on</strong>ths (Schwarz et al. J. ASBC 62(4):147,<br />

2004). Germinati<strong>on</strong> following accelerated seed aging was found to be a more reliable<br />

predictor (r=0.73) of germinati<strong>on</strong> following 7 m<strong>on</strong>ths of storage. Accelerated aging is<br />

performed by heating seed at 41 o C for 48 hr at 80% RH prior to germinati<strong>on</strong> testing.<br />

This treatment resulted in a 0 to 50% reducti<strong>on</strong> in the observed germinative energy.<br />

The objective of this study is to evaluate the utility accelerated seed aging to predict the<br />

l<strong>on</strong>g term storage viability of barley. The study was initiated with the 2004 crop, and<br />

sample collecti<strong>on</strong> will be c<strong>on</strong>tinued for through 2006. Where possible, samples will be<br />

selected to include some sprouting. Storage is at room temperature (24 o C), 7 o C, and<br />

under outdoor ambient c<strong>on</strong>diti<strong>on</strong>s. Germinative will be determined 3 times each year,<br />

and for a total of 3 years storage. Accelerated aging is performed, as described above,<br />

following harvest. Data for the 2004 -2006 samples is shown in Table III.<br />

Table III<br />

Germinati<strong>on</strong> and Sprouting Parameters of the 2004 - 2006<strong>Barley</strong> Samples<br />

Selected for Study of Storage Viability (data is 4 m<strong>on</strong>ths post-harvest)<br />

Germinative<br />

Energy<br />

(4 ml, %)<br />

2004 2005<br />

2006 2004<br />

Accelerated Aging<br />

Germinative Energy<br />

(%)<br />

2005 2006 2004<br />

Water Sensitivity<br />

(4-8 ml, %)<br />

2005 2006 2004<br />

RVA<br />

Stirring Number<br />

2005 2006<br />

N 15 15 15 15 15 15 15 15 15 15 15 15<br />

Mean 92 95 98 72 86 93 33 24 7 101 127 135<br />

Minimum 85 77 84 8 77 40 9 4 0 5 65 4<br />

Maximum 100 100 100 93 100 100 75 48 40 216 191 242<br />

(B) <strong>Barley</strong> CAP Project (Dr Yin Li). We are screening 960 breeder’s lines for betaglucanase<br />

activity as part of the <strong>Barley</strong> CAP Project (<strong>Barley</strong> Coordinated Agricultural<br />

Project). Lines will be screened at low and elevated temperatures to detect possible<br />

differences in thermostability. A subset of the 960 lines will also be analyzed for<br />

lipoxygenase activity.<br />

The barley Coordinated Agricultural Project (CAP) is a community effort of 30 scientists<br />

from 19 instituti<strong>on</strong>s (http://barleycap.coafes.umn.edu/ ). The University of Minnesota is<br />

87

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