Determining The Effect of Mass Selection for FHB Resistance in Soft Red Winter Wheat Using an Image-Based Optical Sorter
Fusarium head blight (FHB) or head scab, caused by Fusarium graminearum Schwabe [telomorph: Gibberella zeae Schwein.(Petch)], is one of the most destructive diseases of wheat (Triticum aestivum L.) worldwide. Numerous strategies for scab resistance breeding are in use, including phenotypic selecti...
Main Authors: | , , , |
---|---|
Format: | Article |
Language: | Arabic |
Published: |
University of Al-Qadisiya
2019-12-01
|
Series: | Al-Qadisiyah Journal For Agriculture Sciences |
Subjects: | |
Online Access: | http://qu.edu.iq/jouagr/index.php/QJAS/article/view/83 |
Summary: | Fusarium head blight (FHB) or head scab, caused by Fusarium graminearum Schwabe [telomorph:
Gibberella zeae Schwein.(Petch)], is one of the most destructive diseases of wheat (Triticum aestivum L.)
worldwide. Numerous strategies for scab resistance breeding are in use, including phenotypic selection for
low severity and marker-assisted selection for resistance QTL. The most destructive consequences of scab
are evidenced through a reduction in grain quality, and the presence of mycotoxins, the most common of
which is deoxynivalenol (DON). Thus, there is great interest among breeders in selecting for resistance to
both of these traits. To this end, a study was devised as follows. In 2010, 20 bulk F3 SRW wheat populations
with scab resistant parents in their pedigrees were harvested by population from unreplicated plots near
Lexington, KY. The plots were affected by a naturally occurring mild-moderate scab epidemic. The grain
was sorted on a USDA/ARS and National Manufacturing Seed Sorter System with color camera according to
a calibration that reflected visual differences between asymptomatic grain and grain showing FHB
symptoms. This process was repeated in 2011 using grain from plots that had conidial suspension applied at
anthesis. In 2012, an unreplicated plot study of the C0, C1 and C2 cycles of selection, inoculated with grain
spawn and conidial suspension, was evaluated for Fusarium damaged kernels (FDK) and DON concentration.
An additional cycle of selection was conducted by running the bulk grain through the sorter. In October
2012, 4 selection cycles of the 20 populations were planted in a RCB experiment at Lexington and Princeton,
KY. Bulk populations were planted in both scab nursery and plots, and C3 accepted and rejected of all
populations and derived lines of 2 populations were planted in the scab nursery in Lexington, KY. Some
populations had FDK and DON reduction with selection, and some derived lines had either numerical or
significant reduction with selection. Although the accepted fraction had non-significant reduction compared
with the rejected fraction over the populations, FDK and DON means were obviously lower in accepted than
in rejected fractions. |
---|---|
ISSN: | 2077-5822 2618-1479 |