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Preharvest Sprouting Tolerance in Current Soft Red Winter Wheat Cultivars

Permanent URL:
http://handle.nal.usda.gov/10113/43383
Abstract:
Preharvest sprouting (PHS) results in unacceptable flour quality for a portion of the mid-Atlantic soft red winter wheat (SRWW) (Triticum aestivum L.) crop annually. This research evaluates inherent dormancy in current mid-Atlantic wheat cultivars using grain falling number after delayed harvest and the weighted germination index (WGI) to predict PHS. Individual spikes from 15 wheat cultivars grown in Virginia in 2007 and 2008 were harvested at physiological maturity and seeds germinated under controlled conditions. A WGI was calculated that gave greater weight to cultivars with seeds that germinated more quickly. The WGI effectively identified very high and low dormancy SRWW cultivars; however, the influence of environment during grain fill was important, especially for cultivars with moderate dormancy. To evaluate PHS tolerance by line under natural conditions, plots were left standing up to 6 wk after normal harvest date. Final harvest falling numbers were used to separate cultivars into PHS resistance groups. Strong relationships were found among PHS resistance groups, and WGI was determined at both 10 and 30°C. This indicates that PHS resistance groups were good predictors of dormancy and relative response of cultivars to delayed harvest. The morphological characteristics of head angle, glume tenacity, and awn length had no significant effect on PHS. Artificial wetting resulted in a major loss of quality after just one event, emphasizing the need for timely wheat harvest.
Author(s):
Hughes, K.R. , Griffey, C.A. , Parrish, D.J. , Barbeau, W.E. , Souza, E. , Thomason, W.E.
Subject(s):
Triticum aestivum , soft red winter wheat , grain crops , cultivars , grain sprouting , food quality , flour , seed dormancy , falling number , genetic variation , environmental factors , filling period , harvest date , phenology , Virginia
Format:
p. 1449-1457.
Note:
Includes references
Source:
Crop science 2010 July-Aug, v. 50, no. 4
Language:
English
Year:
2010
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
File:
Download [PDF File]
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.