ABILITY OF THE CANADIAN GRADING SYSTEM TO SEGREGATE CANADIAN WHEAT BY ALPHA-AMYLASE LEVELS

1989 ◽  
Vol 69 (1) ◽  
pp. 39-48 ◽  
Author(s):  
J. E. KRUGER ◽  
J. C. BABB ◽  
L. J. MORRIS ◽  
K. H. TIPPLES
Keyword(s):  
Triticum Aestivum L ◽  
Preharvest Sprouting ◽  
Alpha Amylase ◽  
Grading System ◽  
Lower Grade ◽  
Falling Number ◽  
Visual Grading ◽  
Canadian Prairies ◽  
Testing Period ◽  
Increased Susceptibility

A survey of falling number values in carlots of most classes of wheat (Triticum aestivum L.) was undertaken between October 1985 and February 1986. The purpose was to assess the effectiveness of the present visual grading system for segregating wheat by α-amylase levels as indicated by the falling number method. In addition, the survey was used to pinpoint areas of the western Canadian prairies from which sprout-damaged wheat originated. CWRS wheat had increasing amounts of α-amylase (lower falling number values) with lower grade. The values obtained for a given grade remained relatively constant over the entire testing period. Furthermore, the interdecile range in falling number values for the samples in a particular grade was only around 110 s. Other classes of wheat (CPS, CWSWS, CWRW) exhibited lower falling number values than CWRS wheat, reflecting increased susceptibility to preharvest sprouting and/or different tolerances for maximum percentage of sprouted kernels. Over the testing period, certain grades of some classes also varied more than CWRS wheats in falling number values. The interdecile range in values for these classes was very large and there was considerable overlap in falling number between grades. This suggests that some form of α-amylase testing could be used to advantage for these classes of wheat to ensure more consistent and uniform quality.Key words: Wheat, alpha-amylase, grading, falling number

scholarly journals The genetics of late maturity alpha-amylase (LMA) in North American spring wheat (Triticum aestivum L.)

2021 ◽  
pp. 1-10
Author(s):  
Chang Liu ◽  
Rehana S. Parveen ◽  
Samuel R. Revolinski ◽  
Kimberly A. Garland Campbell ◽  
Michael O. Pumphrey ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Spring Wheat ◽  
North American ◽  
Genome Wide Association Study ◽  
Triticum Aestivum L ◽  
Preharvest Sprouting ◽  
Alpha Amylase ◽  
Reduced Height ◽  
Increased Risk ◽  
Late Maturity

Abstract Genetic susceptibility to late maturity alpha-amylase (LMA) in wheat (Triticum aestivum L.) results in increased alpha-amylase activity in mature grain when cool conditions occur during late grain maturation. Farmers are forced to sell wheat grain with elevated alpha-amylase at a discount because it has an increased risk of poor end-product quality. This problem can result from either LMA or preharvest sprouting, grain germination on the mother plant when rain occurs before harvest. Whereas preharvest sprouting is a well-understood problem, little is known about the risk LMA poses to North American wheat crops. To examine this, LMA susceptibility was characterized in a panel of 251 North American hard spring wheat lines, representing ten geographical areas. It appears that there is substantial LMA susceptibility in North American wheat since only 27% of the lines showed reproducible LMA resistance following cold-induction experiments. A preliminary genome-wide association study detected six significant marker-trait associations. LMA in North American wheat may result from genetic mechanisms similar to those previously observed in Australian and International Maize and Wheat Improvement Center (CIMMYT) germplasm since two of the detected QTLs, QLMA.wsu.7B and QLMA.wsu.6B, co-localized with previously reported loci. The Reduced height (Rht) loci also influenced LMA. Elevated alpha-amylase levels were significantly associated with the presence of both wild-type and tall height, rht-B1a and rht-D1a, loci in both cold-treated and untreated samples.

Evaluation and selection of bread wheat (Triticum aestivum L.) for preharvest sprouting tolerance

1995 ◽  
Vol 46 (3) ◽  
pp. 463 ◽  
Author(s):  
RM Trethowan
Keyword(s):  
Bread Wheat ◽  
Seed Dormancy ◽  
Triticum Aestivum L ◽  
Preharvest Sprouting ◽  
First Year ◽  
Falling Number ◽  
Selection For ◽  
Visual Measurements ◽  
Selection Of ◽  
Rain Simulator

This paper examines the success of selection for preharvest sprouting tolerance in white-grained bread wheat using a standard wetting treatment, germination of hand-threshed seed and falling number measurements. The rain simulator was usefull in shifting the population mean of field grown material towards higher levels of tolerance in successive years; however, large genotype x year interactions in material sown under rain protection did not allow accurate assessment of individual genotypes. The most accurate assessments were achieved using falling number measurements (h2 = 80.7%) and hand-threshed seed germinations (h2 = 38.4%), where no genotype x year interactions were recorded. Seed dormancy (determined from hand threshed grain) correlated significantly with change in falling number following 3 days' treatment in the rain simulator ( r = -0-56**). Visual measurements scored in the rain simulator, however, did not correlate significantly with seed dormancy in the first year (r = 0.20) but correlated strongly in the second (r = 0.73***). In comparisons of the same test between years, falling number (without rain treatment) and seed dormancy were significantly correlated (r = 0.68* and 0.90***, respectively), whilst visual scores of sprouting showed no association (r = -0.03).

McKenzie hard red spring wheat

2003 ◽  
Vol 83 (3) ◽  
pp. 565-569 ◽  
Author(s):  
R. J. Graf ◽  
P. Hucl ◽  
B. R. Orshinsky ◽  
K. K. Kartha
Keyword(s):  
Spring Wheat ◽  
Triticum Aestivum L ◽  
Falling Number ◽  
Common Bunt ◽  
Early Maturity ◽  
Canadian Prairies ◽  
Hard Red Spring Wheat ◽  
Intermediate Resistance ◽  
High Test ◽  
Hagberg Falling Number

McKenzie hard red spring wheat is the first doubled haploid wheat ( Triticum aestivum L.) cultivar registered in Canada. Evaluation in the Central Bread Wheat Cooperative registration tests from 1994 to 1996 was relative to Neepawa, Katepwa, Roblin and AC M ajestic. McKenzie displayed high grain yield, early maturity, high test weight and high Hagberg falling number. It had resistance to the prevalent races of stem rust, leaf rust, and common bunt, and exhibited intermediate resistance to Fusarium head bligh t. McKenzie is well adapted to all areas of the Canadian prairies and eligible for all grades of Canada Western Red Spring (CWRS) wheat. Key words:

Journey hard red spring wheat

2003 ◽  
Vol 83 (4) ◽  
pp. 807-811 ◽  
Author(s):  
R. J. Graf ◽  
D. A. Potts ◽  
K. M. Hanson
Keyword(s):  
Spring Wheat ◽  
Triticum Aestivum L ◽  
Test Weight ◽  
Preharvest Sprouting ◽  
Head Blight ◽  
Canadian Prairies ◽  
Hard Red Spring Wheat ◽  
Reduced Height ◽  
Cultivar Description ◽  
Sprouting Resistance

Journey hard red spring wheat is adapted to the wheat-growing regions of the Canadian prairies. Evaluation occurred in Central Bread Wheat Cooperative registration tests in 1997, 1999 and 2000 relative to Neepawa, Roblin, AC Majestic, McKenzie and AC Barrie. Journey displayed high grain yield, mid- to late - season maturity, reduced height, very strong straw, high test weight, high protein content and improved pre-harvest sprouting resistance. It exhibited resistance to the prevalent races of stem rust, leaf rust and common bunt, and intermediate resistance to loose smut and Fusarium head blight. Journey is eligible for all grades of Canada Western Red Spring (CWRS) wheat. Key words: Triticum aestivum L., cultivar description, red spring wheat, strong straw, grain protein, test weight, preharvest sprouting resistance, disease resistance

Harvest hard red spring wheat

2010 ◽  
Vol 90 (4) ◽  
pp. 503-509 ◽  
Author(s):  
S L Fox ◽  
T F Townley-Smith ◽  
J B Thomas ◽  
D G Humphreys ◽  
P D Brown ◽  
...  
Keyword(s):  
Spring Wheat ◽  
Triticum Aestivum L ◽  
Preharvest Sprouting ◽  
Head Blight ◽  
Canadian Prairies ◽  
Hard Red Spring Wheat ◽  
Cultivar Description ◽  
End Use ◽  
Sprouting Resistance ◽  
Moderate Resistance

Harvest is a hard red spring wheat that meets the end-use quality specifications of the Canada Western Red Spring wheat class. Harvest is adapted to the wheat growing regions of the Canadian prairies based on data from the Central Bread Wheat Cooperative Registration Test conducted in 1998, 1999 and 2000 and grown in Manitoba and Saskatchewan. The overall grain yield of Harvest was significantly higher compared with the check cultivars Neepawa, Roblin, AC Majestic and AC Barrie, but yielded significantly less than the check cultivar McKenzie. Harvest matured similar to McKenzie and Neepawa, 1 d later than Roblin, 1 d earlier than AC Barrie and significantly earlier than AC Majestic. Harvest was significantly shorter than the check cultivars and had the lowest lodging scores. The test weight of Harvest was similar to McKenzie and AC Barrie and significantly higher than Neepawa, Roblin and AC Majestic. Harvest demonstrated moderate resistance to leaf rust and loose smut and very good resistance to stem rust. Resistance to common bunt was fair, similar to Neepawa and AC Barrie. Resistance to Fusarium head blight was similar to the susceptible check Roblin and poorer than the other checks. Harvest had very good preharvest sprouting resistance with lower sprouting scores than the best check in 2 of 3 years of testing, and it maintained its falling numbers after natural or artificial weathering of spikes. End-use quality tests indicated that Harvest was within the range of the checks for most end-use quality traits. Key words: Triticum aestivum L., cultivar description, red spring wheat, sprouting resistance

Unity hard red spring wheat

2010 ◽  
Vol 90 (1) ◽  
pp. 71-78 ◽  
Author(s):  
S L Fox ◽  
R I.H. McKenzie ◽  
R J Lamb ◽  
I L Wise ◽  
M A.H. Smith ◽  
...  
Keyword(s):  
Spring Wheat ◽  
Triticum Aestivum L ◽  
Test Weight ◽  
Preharvest Sprouting ◽  
Recurrent Parent ◽  
Head Blight ◽  
Canadian Prairies ◽  
Hard Red Spring Wheat ◽  
Wheat Midge ◽  
End Use

Unity is a hard red spring wheat that meets the end-use quality specifications of the Canada Western Red Spring class. Unity is the first spring wheat cultivar registered in Canada that contains the antibiosis resistance gene Sm1, which produces a product that reduces the palatability of developing seeds to wheat midge larvae (Sitodiplosis mosellana Géhin). Unity is a partial backcross derivative of McKenzie, using Clark as the donor of the Sm1 gene for midge resistance. Unity was found to be adapted to the eastern wheat growing regions of the Canadian prairies as represented in the Central Bread Wheat Cooperative Registration Test in 2004, 2005 and 2006. For registration testing, the performance of Unity was estimated using the varietal blend Unity VB, which consisted of 90% Unity and 10% Waskada. In comparison to the check cultivars (Katepwa, McKenzie, CDC Teal, AC Barrie, and Superb), Unity was the highest yielding cultivar overall; although not significant, Unity was 5% higher yielding than McKenzie. Unity matured significantly later than Katepwa and significantly earlier than Superb. Unity had significantly shorter plant stature than Katepwa and significantly taller stature than Superb. Unity had significantly greater lodging scores than AC Barrie and Superb. The test weight of Unity was significantly higher than the best check: 0.9 kg hL-1 higher than McKenzie. Unity expressed resistance to leaf rust, stem rust and common bunt, intermediate resistance to loose smut, and susceptibility to fusarium head blight. Unity had preharvest sprouting resistance with an overall sprouting score similar to the best checks McKenzie and Superb. Unity also maintained its falling numbers following natural or artificial weathering of spikes. The end-use suitability attributes of Unity were similar to the recurrent parent McKenzie for all traits except amylograph viscosity which was significantly higher than all checks except Superb. Key words: Triticum aestivum L., cultivar description, red spring wheat, test weight, preharvest sprouting, wheat midge antibiosis

scholarly journals The Impact of Harvesting Time on Fusarium Mycotoxins in Spring Wheat Grain and Their Interaction with Grain Quality

Agronomy ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 642
Author(s):  
Yuliia Kochiieru ◽  
Audronė Mankevičienė ◽  
Jurgita Cesevičienė ◽  
Roma Semaškienė ◽  
Jūratė Ramanauskienė ◽  
...  
Keyword(s):  
Spring Wheat ◽  
Grain Quality ◽  
Fusarium Species ◽  
Triticum Aestivum L ◽  
Falling Number ◽  
Harvesting Time ◽  
Wheat Grains ◽  
The Impact ◽  
Full Maturity

In this work, we studied the impact of harvesting time on Fusarium mycotoxin occurrence in spring wheat and the effect of mycotoxin contamination on the quality of these grains. The spring wheat grains (Triticum aestivum L.) were collected in 2016–2018 when the crop had reached full maturity, 10 ± 2 days and 17 ± 3 days after full maturity. The grain samples were analyzed for Fusarium infection and co-contamination with mycotoxins deoxynivalenol (DON), zearalenone (ZEA), and T-2 toxin (T-2), as well as the quality of the wheat grains (mass per hectolitre, contents of protein, starch, ash and fat, particle size index (PSI), falling number, sedimentation, wet gluten content, and gluten index). The occurrence of Fusarium spp. fungi and the mycotoxins produced by them in the grains was mostly influenced by the harvesting time and meteorological conditions. The correlations between Fusarium species and the mycotoxins produced by them in the grains of spring wheat showed F. graminearum to be a dominant species, and as a result, higher concentrations of DON and ZEA were determined. The co-occurrence of all the three mycotoxins analyzed (deoxynivalenol, zearalenone, and T-2 toxin) was identified in wheat. In rainy years, a delay in harvesting resulted in diminished grain quality of spring wheat, as indicated by grain mass per hectolitre and falling number. Negative correlations were found in highly contaminated grains between mycotoxins (DON, ZEA, and T-2) and falling number and grain mass per hectolitre values.

Temperature dependence of germinability of wheat (Triticum aestivum L.) grain in relation to pre-harvest sprouting

1984 ◽  
Vol 35 (2) ◽  
pp. 115 ◽  
Author(s):  
DJ Mares
Keyword(s):  
Dry Weight ◽  
Complete Removal ◽  
Triticum Aestivum L ◽  
Treatment Temperature ◽  
Preharvest Sprouting ◽  
Optimum Temperature ◽  
Grain Dormancy ◽  
Lag Period ◽  
Pre Treatment ◽  
Damage Tolerant

Germinability in harvest-mature wheat grain showed a marked dependence on temperature. The optimum temperature for the complete germination of all grains ranged from 20�C for the non-dormant variety, Timgalen, to 10�C for the strongly dormant red wheat RL 4137, whereas the optimum in terms of the shortest lag period ranged from 25� to 15�C for the same varieties. Germinability gradually increased during post-harvest storage and, for after-ripened grain, the optimum temperature for both complete germination and shortest lag period were greater than 30�C. Germinability could also be increased by pre-treating imbibing grains at temperatures of 5�, 10� or in some cases 15�C. This treatment was only effective for grain at moisture contents >25% (dry weight) and the effect was not reversed by redesiccation. The pre-treatment temperature required for maximum germinability decreased with increasing levels of grain dormancy. Complete removal of dormancy required a pre-treatment period of c. 48 h; however, lesser periods gave the shortest lag period in the case of the dormant varieties. The implications of these results for the utilization of dormancy in the development of preharvest sprouting damage tolerant varieties and their subsequent use in practice are discussed.

scholarly journals Intraoperative perfusion assessment of the proximal colon by a visual grading system for safe anastomosis after resection in left-sided colorectal cancer patients

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hyo Seon Ryu ◽  
Seok-Byung Lim ◽  
Eu-Tteum Choi ◽  
Inho Song ◽  
Jong Lyul Lee ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Colorectal Anastomosis ◽  
Proximal Colon ◽  
Grading System ◽  
Visual Grading ◽  
Old Patients ◽  
Factors Affecting ◽  
Poor Grade ◽  
Perfusion Assessment ◽  
Colorectal Cancer Patients

AbstractWe aimed to evaluate the clinical feasibility of a new visual grading system. We included 50 patients who underwent resection of primary colorectal cancer. Before anastomosis, the marginal vessel was cut and the perfusion status was assessed by a visual grading system. The visual grading system is comprised of five grades according to the bleeding from the marginal vessel and is categorized into 4 groups: good (grade A and B), moderate (grade C), poor (grade D) and none (grade E). Colorectal anastomosis was performed only in the good and moderate groups. We compared postoperative outcomes between the good and moderate groups and analysed the factors affecting the perfusion grade. Among the patients, 48% were grade A, 12% were grade B, and 40% were grade C. There was no anastomotic leakage. Only one patient with grade C showed ischemic colitis and needed reoperation. Age was the only factor correlated with perfusion grade in multivariate analysis (OR 1.080, 95% CI 1.006–1.159, p = 0.034). The perfusion grades were significantly different between > 65 and < 65 year-old patients (> 65, A 29.2% B 12.5% C 58.3% vs. < 65, A 65.4% B 11.5% C 23.1%, p = 0.006). Our intraoperative perfusion assessment that uses a cutting method and a visual grading system is simple and useful for performing a safe anastomosis after colorectal resection. If the perfusion grade is better than grade C, an anastomosis can be performed safely. Age was found to be an important factor affecting the perfusion grade.

Red smudge infection modifies sprouting response in four wheat lines

2003 ◽  
Vol 83 (1) ◽  
pp. 163-169 ◽  
Author(s):  
S. L. Fox ◽  
M. R. Fernandez ◽  
R. M. DePauw
Keyword(s):  
Crude Extract ◽  
Triticum Aestivum L ◽  
Preharvest Sprouting ◽  
Conidial Suspension ◽  
Percentage Germination ◽  
Germination Time ◽  
Pyrenophora Tritici Repentis ◽  
Mean Germination Time ◽  
Sprouting Resistance ◽  
Lower Temperature

Infection of wheat (Triticum aestivum L.) spikes by Pyrenophora tritici-repentis (Died.) Drechs. (Ptr) causes kernel discolouration, reducing the commercial value of the grain. Preharvest sprouting in wheat causes loss of grain yield, grain functionality and value as seed. The objective of this research was to determine the effects of Ptr infection on the expression of preharvest sprouting response. Four genotypes representing a range of preharvest sprouting response were studied: RL4137 has very good sprouting resistance; SC8021V2, good; AC Karma, fair; and Genesis, poor. These genotypes were grown in a growth cabinet and their spikes were artificially inoculated with a conidial suspension of Ptr or water. Spikes were collected at physiologic maturity, threshed by hand and germinated on wetted filter paper at 10 or 20°C to obtain a percentage germination and a mean germination time. Healthy seeds were also germinated in a solution containing a crude extract of the fungus. At 20°C, sprouting-resistant genotypes showed a significant delay in germination compared to susceptible genotypes; however, differences were not significant at the lower temperature. Genesis germinated quickly at both temperatures. All genotypes except Genesis had reductions in sprouting resistance when infected by Ptr, but these effects were significant only at 20°C. When inoculated with Ptr and germinated at 20°C, AC Karma germinated as quickly as the water controls and gave a preharvest sprouting response similar to Genesis. However, SC8021V2 and RL4137 inoculated with Ptr retained 40 and 78%, respectively, of their mean germination time compared to the water controls. Germination of healthy seeds in a solution containing a crude extract of Ptr increased the percentage germination and shortened the mean germination time of all genotypes, but did not result in significant changes for any individual line. Key words: Triticum, Pyrenophora tritici-repentis, preharvest sprouting, smudge

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