scholarly journals Consistency of Yield Ranking and Adaptability Patterns of Winter Wheat Cultivars between Multi-Environmental Trials and Farmer Surveys

Agronomy ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 245 ◽  
Author(s):  
Marcin Studnicki ◽  
Manjit S. Kang ◽  
Marzena Iwańska ◽  
Tadeusz Oleksiak ◽  
Elżbieta Wójcik-Gront ◽  
...  
Keyword(s):  
Winter Wheat ◽  
High Efficiency ◽  
Triticum Aestivum L ◽  
Statistical Methodology ◽  
High Input ◽  
Yield Data ◽  
Ecological Regions ◽  
Performance Patterns ◽  
Winter Wheat Cultivars ◽  
Farmer Surveys

Cultivar recommendation based on mean performance determined by multi-environment trials (METs) conducted on research stations could be unreliable and ineffective for assessing performance in farmers’ fields. It is important to improve the efficiency of cultivar recommendation based on METs. For this purpose, it would be useful to validate recommendations based on yield data obtained directly from farmers, i.e., through surveys. The aim of this study was to discuss the possibility and statistical methodology of assessing cultivar performance patterns based on yield data obtained through farmer surveys. We suggest that this might be accomplished by assessing the conformity of yield ranking and yield performance patterns between MET and survey datasets in the same growing regions. As an example, we compare winter wheat (Triticum aestivum L.) yield data obtained from Polish farmers via surveys with data obtained via METs. In the METs, cultivars were evaluated at two levels of crop-management, a moderate-input management (MIM) system and a high-input management (HIM) system. Based on the yield evaluations in the current study, half of the agro-ecological regions had relatively high levels of consistency in yield rankings between the MET MIM system and survey yield dataset. This indicated a relatively high efficiency of cultivar recommendations based on METs in these regions, especially for the MIM system. For the HIM system, however, with the exception of one region, we observed a poor degree of consistency in cultivar ranking.

scholarly journals Polymorphism of Gli-D1 alleles of Kragujevac’s winter wheat cultivars (Triticum aestivum L.)

Genetika ◽  
2007 ◽  
Vol 39 (2) ◽  
pp. 273-282
Author(s):  
Desimir Knezevic ◽  
Aleksandra Novoselskaya-Dragovich
Keyword(s):  
Triticum Aestivum ◽  
Winter Wheat ◽  
Molecular Mass ◽  
Gel Electrophoresis ◽  
Polyacrylamide Gel Electrophoresis ◽  
Triticum Aestivum L ◽  
Polyacrylamide Gel ◽  
Wheat Cultivars ◽  
Number Of Components ◽  
Winter Wheat Cultivars

Composition of gliadins encoded by Gli-D1 allele as well polymorphisms of Gli-D1 allele investigated in 25 wheat cultivars by using acid polyacrylamide gel electrophoresis. Electrophoregrams obtained by polyacrylamide gel electrophoresis were used for estimation variability of gliadin components and identification of gliadin blocks. Five gliadin blocks encoded by different alleles at Gli-D1 locus were apparently expressed and identified. Gliadin blocks differed according to number of components and their molecular mass. Variability of determined block components indicates that existing polymorphisms of gliadins alleles. Frequency of identified 5 alleles at Gli-D1 locus was in ratio from 4% to 52%. The highest frequency of b allele and the of g allele was found.

scholarly journals Vernalization Response of Some Winter Wheat Cultivars (Triticum aestivum L.)

2012 ◽  
Vol 38 (No. 3-4) ◽  
pp. 97-103 ◽  
Author(s):  
J. Košner ◽  
K. Pánková
Keyword(s):  
Triticum Aestivum ◽  
Winter Wheat ◽  
Agronomic Traits ◽  
Triticum Aestivum L ◽  
Vernalization Requirement ◽  
Photoperiod Response ◽  
Vernalization Response ◽  
Multiple Alleles ◽  
Winter Wheat Cultivars ◽  
The Given

For 17 cultivars of winter wheat (Triticum aestivum L.) different vernalization and photoperiod responses were detected. The effect of photoperiod sensitivity was not significantly changed by vernalization; different vernalization responses were probably due to the presence of multiple alleles at Vrn loci. The delay in heading depended on the vernalization deficit exponentially: y = Parameter (1) + (y0 – Parameter (1)) × EXP (Parameter (2) × (x – x0)). The dependence was shown to be general and significant for the given model in all the studied cultivars. Individual regressions characterised responses of cultivars to a deficit of vernalization treatment. Cluster analysis according to the characterisation obtained (full vernalization requirement, minimum vernalization requirement, insufficient vernalization and parameters of the dependence) showed the relationships between cultivars and enabled their grouping by similar profiles of vernalization, and, possibly, of photoperiod response. In individual cultivars, an attempt was made to use the model to predict performance for some agronomic traits.

scholarly journals Agronomic Traits Analysis of Ten Winter Wheat Cultivars Clustered by UAV-Derived Vegetation Indices

2020 ◽  
Vol 12 (2) ◽  
pp. 249 ◽  
Author(s):  
Stefano Marino ◽  
Arturo Alvino
Keyword(s):  
Winter Wheat ◽  
Agronomic Traits ◽  
Vegetation Indices ◽  
Ground Truth ◽  
Accurate Estimation ◽  
Wheat Cultivars ◽  
Yield Data ◽  
Related Data ◽  
High Data ◽  
Winter Wheat Cultivars

Timely and accurate estimation of crop yield variability before harvest is crucial in precision farming. This study is aimed to evaluate the ability of cluster analysis based on Vegetation Indices (VIs) that were obtained from UAVs to predict the spatial variability on agronomic traits of ten winter wheat cultivars. Five VIs groups were identified and the ground truth yield-related data were analyzed for clusters validation. The yield data revealed a value of 6.91 t ha−1 for the first cluster with the highest VIs value and a decrease of −12%, −21%, and −27% for the 2nd, 3rd, and 4th clusters; respectively; the 5th cluster; with the lowest VIs value showed the lower yield values (4 t ha−1). Agronomic traits, such as dry biomass, spike numbers, and weight were grouped according to VIs clusters and analyzed and showed the same trends. The analysis of spatial distribution and agronomic data of the ten cultivars within the single clusters highlighted that the most productive varieties showing a greater value of spike weight and numbers and a greater presence of areas with high values of VIs and vice versa the less productive once, though two cultivars showed productions not linked to cluster classification and high data range variability were recorded. Cluster identified by high-resolution UAV vegetation indices can be a valid strategy although its effectiveness is closely linked to the cultivar component and, therefore, requires extensive verification.

scholarly journals Adaptation patterns of winter wheat cultivars in agro-ecological regions

2019 ◽  
Vol 76 (2) ◽  
pp. 148-156 ◽  
Author(s):  
Marcin Studnicki ◽  
Adriana Derejko ◽  
Elżbieta Wójcik-Gront ◽  
Michał Kosma
Keyword(s):  
Winter Wheat ◽  
Wheat Cultivars ◽  
Ecological Regions ◽  
Winter Wheat Cultivars

EFFECT OF TIME OF APPLICATION OF HERBICIDES ON YIELD OF THREE WINTER WHEAT CULTIVARS

1990 ◽  
Vol 70 (3) ◽  
pp. 605-609 ◽  
Author(s):  
J. A. IVANY ◽  
H. G. NASS ◽  
J. B. SANDERSON
Keyword(s):  
Winter Wheat ◽  
Prince Edward Island ◽  
Field Experiments ◽  
Triticum Aestivum L ◽  
Kernel Weight ◽  
Yield Losses ◽  
Time Of Application ◽  
Winter Wheat Cultivars ◽  
Effect On Yield ◽  
Determine Effect

In field experiments at Charlottetown, Prince Edward Island, herbicides were applied in the fall or spring on winter wheat (Triticum aestivum L.) to determine effect on yield. Application of 2,4-D or the mixture 2,4-D/mecoprop/dicamba in the fall gave significantly lower yields than when spring-applied on the cultivar Lennox. The herbicides MCPA, bromoxynil, dicamba, mecoprop, chlorsulfuron, MCPA/dicamba, and MCPA/bromoxynil had no adverse effect on yield of Lennox at either time of application. A further study on the cultivars Lennox, F29-76, and Borden using the herbicides MCPA, bromoxynil, MCPA/dicamba, chlorsulfuron, and dicamba showed no detrimental effects on 1000 kernel weight, or percent winter survival from fall or spring application. Yield losses were noted for spring application of dicamba but not for MCPA/dicamba and all cultivars responded similarly to all herbicide treatments.Key words: Wheat (winter) cultivars, fall versus spring application, 2,4-D, MCPA, dicamba, bromoxynil, chlorsulfuron

scholarly journals Effects of tillage system and forecrop type on frequency of Fusarium culmorum and F. avenaceum occurrence on culm base of some winter wheat (Triticum aestivum L.) cultivars

2012 ◽  
Vol 63 (1) ◽  
pp. 121-128 ◽  
Author(s):  
Ryszard Weber ◽  
Włodzimierz Kita
Keyword(s):  
Winter Wheat ◽  
Fusarium Culmorum ◽  
Triticum Aestivum L ◽  
Wheat Cultivars ◽  
Cultivation System ◽  
Preceding Crop ◽  
Plant Cultivation ◽  
Crop Type ◽  
Tillage System ◽  
Winter Wheat Cultivars

In the years 2001 - 2003, there were analyzed relations between the number of <i>Fusarium culmorum</i> and <i>F. avenaceum</i>, fungi found on culm base parts of stalks of seven winter wheat cultivars, and preceding crop type as well as the cultivation system. The research was carried out in Poland, on light soil plots of a Lower Silesia-based experimental station subordinate to the Institute of Soil Science and Plant Cultivation (IUNG). The loglinear and correspondence analyses proved varying immunity of particular wheat cultivars to <i>F. culmorum</i> and <i>F. avenaceum</i> fungi. There were also observed significant differences in <i>Fusarium</i> diseases of wheat as dependent on precipitation and temperature in the growing season. The Kobra cultivar was highly resistant to <i>F. avenaceum</i>. The lowest amounts of <i>F. culmorum</i> fungi were detected in the culm base parts of the Izolda cultivar. The cultivation of corn, as a preceding crop for oats and for spring wheat, did significantly differentiate varieties of fungi in the cultivation systems examined. In the plough cultivation system, wheat was mainly infected by <i>Fusarium culmorum</i>, whereas in direct sowing, particular cultivars of wheat were mostly infected by <i>F. avenaceum</i>.

EFFECT OF A Rht GENE CONDITIONING THE SEMIDWARF CHARACTER ON WINTERHARDINESS IN WINTER WHEAT (Triticum aestivum L. em Thell)

1988 ◽  
Vol 68 (2) ◽  
pp. 301-309 ◽  
Author(s):  
D. J. GILLILAND ◽  
D. B. FOWLER
Keyword(s):  
Triticum Aestivum ◽  
Gibberellic Acid ◽  
Winter Wheat ◽  
Great Plains ◽  
Cold Hardiness ◽  
Triticum Aestivum L ◽  
Breeding Strategy ◽  
Sensitivity Analyses ◽  
Wheat Cultivars ◽  
Winter Wheat Cultivars

In the northern part of the North American Great Plains, the level of cultivar winter-hardiness required for winter wheat (Triticum aestivum L.) production is extremely high. Presently, available winter wheat cultivars with adequate winterhardiness are tall and, under favourable growing conditions, crop lodging and excessive amounts of straw can present serious production problems. Consequently, cultivars with short, stiff straw and a high harvest index would be desirable for high production areas within this region. However, semidwarf cultivars with superior winterhardiness have not yet been developed. In this study, six GA-insensitive (Rht) semidwarf parents with poor to moderate winterhardiness were crossed with three GA-sensitive (rht) tall parents possessing good winterhardiness to produce 20 different single, three-way and double crosses. These crosses were evaluated to determine if the GA-insensitive character could be combined with a high level of winterhardiness in winter wheat. Gibberellic acid (GA) sensitivity analyses of F2 seedlings established that a single GA-insensitive gene was involved in each cross. F2-derived F3 and F3-derived F4 lines were assessed for GA-sensitivity and winterhardiness levels were determined from field survival at several locations in Saskatchewan, Canada. Winter survival of homozygous GA-sensitive and GA-insensitive lines were similar in both generations. Lines with winterhardiness levels similar to those of the three tall parent cultivars were recovered in all GA-response classes. The absence of a meaningful pleiotropic effect of Rht genes on winterhardiness indicates that the reason semidwarf cultivars with superior winterhardiness levels have not been developed is due to the lack of a concentrated breeding effort to combine the two characters. A breeding strategy for the production of adapted winterhardy semidwarf winter wheat cultivars is discussed. The influence of endogenous gibberellin levels on cold hardiness in winter wheat is also considered.Key words: Cold hardiness, field survival, Triticum aestivum L, semidwarf, Gibberellic acid

INFLUENCE OF DURATION OF GROWTH, SEED SIZE, AND SEEDING DEPTH ON COLD HARDINESS OF TWO HARDY WINTER WHEAT CULTIVARS

1978 ◽  
Vol 58 (4) ◽  
pp. 917-921 ◽  
Author(s):  
S. FREYMAN
Keyword(s):  
Winter Wheat ◽  
Cold Hardiness ◽  
Marked Effect ◽  
Dry Weight ◽  
Triticum Aestivum L ◽  
Controlled Environment ◽  
Small Seed ◽  
Winter Wheat Cultivars ◽  
Freezing Test ◽  
Test Plants

Two winter wheat (Triticum aestivum L.) cultivars, Kharkov 22 MC and Winalta, were grown for 14 or 28 days under controlled environment from large or small seed or from seed with about half the endosperm removed. The kernels were seeded either 1 or 5 cm deep. After a 14-day cold hardening period followed by a freezing test, plants that had grown actively for 28 days were hardier than those that had grown actively for only 14 days. Plants from large kernels were hardier than those from small kernels, which in turn were slightly hardier than those from kernels with half the endosperm removed. Deep seeding reduced cold hardiness. The treatments had a marked effect on the dry weight of crowns and a smaller effect on crown total available carbohydrate content, both of which were positively correlated with cold hardiness, whereas water content was negatively correlated with cold hardiness.

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