scholarly journals Maize brace roots provide stalk anchorage

2020 ◽  
Author(s):  
Jonathan W. Reneau ◽  
Rajdeep S. Khangura ◽  
Adam Stager ◽  
Lindsay Erndwein ◽  
Teclemariam Weldekidan ◽  
...  
Keyword(s):  
Flowering Time ◽  
Grain Quality ◽  
Plant Traits ◽  
Mechanical Failure ◽  
Rigid Base ◽  
Crop Loss ◽  
Lodging Resistance ◽  
Plant Biomechanics ◽  
Root Lodging ◽  
Time Selection

AbstractMechanical failure, known as lodging, negatively impacts yield and grain quality in crops. Limiting crop loss from lodging requires an understanding of the plant traits that contribute to lodging-resistance. In maize, specialized aerial brace roots are reported to reduce root lodging. However, their direct contribution to plant biomechanics has not been measured. In this manuscript, we find that brace roots establish a rigid base (i.e. stalk anchorage) to limit plant deflection in maize. The more brace root whorls that contact the soil, the greater the contribution of brace roots to anchorage. Previous studies have linked the number of brace root whorls to flowering time in maize. To determine if flowering time selection alters the brace root contribution to anchorage, a subset of the Hallauer’s Tusón tropical population was analyzed. Despite a significant change in flowering time, selection neither altered the number of brace root whorls in the soil nor the overall contribution of brace roots to anchorage. These results demonstrate that brace roots provide a rigid base in maize, but the contribution to anchorage is not linearly related to flowering time.

scholarly journals Brace root phenotypes predict root lodging susceptibility and the contribution to anchorage in maize

2021 ◽  
Author(s):  
Ashley N Hostetler ◽  
Lindsay Erndwein ◽  
Jonathan W Reneau ◽  
William Cantera ◽  
Adam Stager ◽  
...  
Keyword(s):  
Plant Height ◽  
Prediction Accuracy ◽  
Crop Production ◽  
Global Climate ◽  
Root Traits ◽  
The United States ◽  
Lodging Resistance ◽  
Node Number ◽  
Plant Biomechanics ◽  
Root Lodging

A changing global climate brings increasingly prevalent and severe storms that threaten crop production by imparting mechanical stresses. Plant failure due to mechanical stress is termed lodging and in the United States, yield loss due to lodging has been estimated at 7-25% for maize (Zea mays). In maize, the presence of specialized aerial brace roots has been shown to increase anchorage and root lodging resistance. However, beyond scoring for presence, there have been limited attempts to define the brace root phenotypes that optimize anchorage. This study reports variable root lodging and plant biomechanics in a population of 52 maize inbred lines. To quantify the variation in brace root phenotypes within this population, a semi-automated phenotyping workflow was developed. These empirical measurements were integrated into predictive random forest models to demonstrate that brace root phenotypes can classify root lodging incidence and plant biomechanics. The prediction accuracy of these models is driven by multiple brace root phenotypes suggesting that anchorage can be optimized by the manipulation of multiple functional traits. Plant height has been previously associated with lodging susceptibility yet the inclusion of plant height as a predictor does not always improve prediction accuracy. Previously, brace root node number has been shown to be genetically linked to plant height and here we show that additional brace root phenotypes are linked to plant height but with opposing effects on root lodging susceptibility. Together these data define the important brace root phenotypes that predict root lodging resistance and demonstrate the need to uncouple the linkage between plant height and root traits for the development of climate resilient crops.

scholarly journals Gene body methylation mediates epigenetic inheritance of plant traits

2021 ◽  
Author(s):  
Zaigham Shahzad ◽  
Jonathan D. Moore ◽  
Daniel Zilberman
Keyword(s):  
Gene Expression ◽  
Flowering Time ◽  
Cytosine Methylation ◽  
Plant Traits ◽  
Phenotypic Diversity ◽  
Strong Association ◽  
Epigenetic Inheritance ◽  
Evolutionary Significance ◽  
Gene Body ◽  
Gene Body Methylation

AbstractCytosine methylation is an epigenetically heritable DNA modification common in plant and animal genes, but the functional and evolutionary significance of gene body methylation (gbM) has remained enigmatic. Here we show that gbM enhances gene expression in Arabidopsis thaliana. We also demonstrate that natural gbM variation influences drought and heat tolerance and flowering time by modulating gene expression, including that of Flowering Locus C (FLC). Notably, epigenetic variation accounts for as much trait heritability in natural populations as DNA sequence polymorphism. Furthermore, we identify gbM variation in numerous genes associated with environmental variables, including a strong association between flowering time, spring atmospheric NO2 – a by-product of fossil fuel burning – and FLC epialleles. Our study demonstrates that gbM is an important modulator of gene expression, and its natural variation fundamentally shapes phenotypic diversity in plant populations. Thus, gbM provides an epigenetic basis for adaptive evolution independent of genetic polymorphism.

scholarly journals Quantile function modeling with application to salinity tolerance analysis of plant data

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Gaurav Agarwal ◽  
Stephanie Saade ◽  
Mohammad Shahid ◽  
Mark Tester ◽  
Ying Sun
Keyword(s):  
Quantile Regression ◽  
Flowering Time ◽  
Salinity Tolerance ◽  
Plant Traits ◽  
Tolerance Index ◽  
Grain Number ◽  
Analysis Methods ◽  
Rate Of Increase ◽  
Bivariate Quantile ◽  
Ear Number

Abstract Background In plant science, the study of salinity tolerance is crucial to improving plant growth and productivity under saline conditions. Since quantile regression is a more robust, comprehensive and flexible method of statistical analysis than the commonly used mean regression methods, we applied a set of quantile analysis methods to barley field data. We use univariate and bivariate quantile analysis methods to study the effect of plant traits on yield and salinity tolerance at different quantiles. Results We evaluate the performance of barley accessions under fresh and saline water using quantile regression with covariates such as flowering time, ear number per plant, and grain number per ear. We identify the traits affecting the accessions with high yields, such as late flowering time has a negative impact on yield. Salinity tolerance indices evaluate plant performance under saline conditions relative to control conditions, so we identify the traits affecting the accessions with high values of indices using quantile regression. It was observed that an increase in ear number per plant and grain number per ear in saline conditions increases the salinity tolerance of plants. In the case of grain number per ear, the rate of increase being higher for plants with high yield than plants with average yield. Bivariate quantile analysis methods were used to link the salinity tolerance index with plant traits, and it was observed that the index remains stable for earlier flowering times but declines as the flowering time decreases. Conclusions This analysis has revealed new dimensions of plant responses to salinity that could be relevant to salinity tolerance. Use of univariate quantile analyses for quantifying yield under both conditions facilitates the identification of traits affecting salinity tolerance and is more informative than mean regression. The bivariate quantile analyses allow linking plant traits to salinity tolerance index directly by predicting the joint distribution of yield and it also allows a nonlinear relationship between the yield and plant traits.

A comparison of root and stem lodging risks among winter wheat cultivars

2003 ◽  
Vol 141 (2) ◽  
pp. 191-202 ◽  
Author(s):  
P. M. BERRY ◽  
J. H. SPINK ◽  
A. P. GAY ◽  
J. CRAIGON
Keyword(s):  
Winter Wheat ◽  
Bending Moments ◽  
Wheat Cultivars ◽  
Lodging Resistance ◽  
Wind Speeds ◽  
Winter Wheat Cultivars ◽  
Related Plant ◽  
The Difference ◽  
Root Lodging ◽  
Stem Failure

Plant characters that determine stem and root lodging were measured on 15 winter wheat cultivars at three UK sites between 2000 and 2002. A model of lodging was used to estimate stem failure wind speeds (resistance to stem lodging) and anchorage failure wind speeds (resistance to root lodging). The degree and type of natural lodging was also recorded in the plots and this correlated well with the stem and anchorage failure wind speeds. Only a weak correlation (R2=0·33) was observed between the stem and anchorage failure wind speeds for the 15 cultivars. This can be explained by the absence of genetic correlation between the plant characters that determine the stem and anchorage strength. There was a significant interaction between type of lodging (stem or root) and cultivar for failure wind speed (P<0·001). This showed that the difference between the resistances for root and stem lodging was not the same for all cultivars. Separate classifications for the stem and root lodging resistance of cultivars are developed that would allow the most appropriate crop management to reduce the risk of both types of lodging. Significant differences were found between cultivars for all lodging-related plant characters (P<0·05). These resulted in the cultivar range of the anchorage failure moment to be 110% of the overall mean. Stem failure moment, shoot and plant base bending moments had ranges of 37–49% of their overall means. Breeders should select for wide, deep root plates and wide stems with a high stem wall failure yield stress for the greatest improvement in lodging resistance.

Kaufmann oat

2003 ◽  
Vol 83 (3) ◽  
pp. 561-563 ◽  
Author(s):  
S. Kibite ◽  
J. Chong ◽  
J. G. Menzies ◽  
K. Turkington ◽  
B. McCallum ◽  
...  
Keyword(s):  
Grain Quality ◽  
Black Soil ◽  
Western Canada ◽  
Loose Smut ◽  
Lodging Resistance ◽  
Milling Quality ◽  
Soil Zone ◽  
Almost All ◽  
Quality Features ◽  
Better Than

Kaufmann is a high-yielding, disease-resistant spring oat ( Avena sativa L.) with improved kernel characteristics and milling quality features. It is resistant to >98% of the crown rust [ Puccinia coronata Corda var. avenea (W.P. Fraser & Ledingham)] isolates found in western Canada. It is also resistant to almost all prevalent races of stem rust (caused by P. graminis Pers. f. sp. avenae Eriks & Henn.), except race NA-67, and all races of loose smut (caused by Ustilago avenae (Pers.) Rostr.) and covered smut (caused by U. kolleri Wille) found in western Canada Kaufmann is moderately susceptible to the PAV strain of BYDV. It has performed at a level equal to or significantly better than AC Medallion in agronomic and grain quality features. It is best adapted t o the Black Soil Zone of Manitoba and the Brown Soil Zone of Saskatchewan, where it has yielded significantly more than AC Medallion while having better lodging resistance and improved grain quality. Key words:

scholarly journals Breeding and genetic patterns in trait expression and efficiency of creation of spring barley cultivars

2018 ◽  
Vol 23 ◽  
pp. 68-73 ◽  
Author(s):  
M. R. Kozachenko ◽  
N. I. Vasko ◽  
O. H. Naumov ◽  
P. M. Solonechnyi ◽  
O. V. Solonechna ◽  
...  
Keyword(s):  
Grain Quality ◽  
Plant Traits ◽  
Spring Barley ◽  
Breeding Method ◽  
Hordeum Vulgare L ◽  
Barley Cultivars ◽  
State Register ◽  
Genetic Patterns ◽  
Yield Capacity ◽  
The Creation

Aim. Solutions of scientific problems of increasing the efficiency of genetic breeding methods are important objectives in the creation of valuable spring barley cultivars. Methods. Analyses of variance, variation, correlation and regression as well as genetic methods of analyzing features of genotypes in the diallel crossing and top-crossing design were used. Results. The important scientific problems with regard to increasing the efficiency of breeding for yield capacity, brewing quality and starch fraction composition were solved by establishing morphological and biological characteristics, dispersion, correlation, variability, adaptability, breeding and genetic peculiarities of inheritance, heritability, components of genetic variation, combining ability of plant traits as well as the effectiveness of hybridization and mutagenesis methods. As a result of the patterns established, the efficiency of the creation of economically valuable spring barley cultivars was increased. Conclusions. The new solutions of important scientific problems of raising the efficiency of breeding for yield capacity and grain quality were proposed and generalized. On this basis, valuable cultivars were created. As of 2017, 17 of them have been were included in the State Register of Plant Varieties suitable for dissemination inUkraine. Keywords: breeding-genetic patterns, Hordeum vulgare L., cultivar, breeding method, yield capacity and grain quality.

scholarly journals High throughput phenotyping of cross-sectional morphology to assess stalk lodging resistance

Plant Methods ◽  
2022 ◽  
Vol 18 (1) ◽  
Author(s):  
Yusuf A. Oduntan ◽  
Christopher J. Stubbs ◽  
Daniel J. Robertson
Keyword(s):  
Finite Element ◽  
High Throughput ◽  
Plant Traits ◽  
Finite Element Models ◽  
Vascular Bundles ◽  
Lodging Resistance ◽  
Cross Sectional ◽  
Conium Maculatum ◽  
Finite Element Software ◽  
Stalk Lodging

Abstract Background Stalk lodging (mechanical failure of plant stems during windstorms) leads to global yield losses in cereal crops estimated to range from 5% to 25% annually. The cross-sectional morphology of plant stalks is a key determinant of stalk lodging resistance. However, previously developed techniques for quantifying cross-sectional morphology of plant stalks are relatively low-throughput, expensive and often require specialized equipment and expertise. There is need for a simple and cost-effective technique to quantify plant traits related to stalk lodging resistance in a high-throughput manner. Results A new phenotyping methodology was developed and applied to a range of plant samples including, maize (Zea mays), sorghum (Sorghum bicolor), wheat (Triticum aestivum), poison hemlock (Conium maculatum), and Arabidopsis (Arabis thaliana). The major diameter, minor diameter, rind thickness and number of vascular bundles were quantified for each of these plant types. Linear correlation analyses demonstrated strong agreement between the newly developed method and more time-consuming manual techniques (R2 > 0.9). In addition, the new method was used to generate several specimen-specific finite element models of plant stalks. All the models compiled without issue and were successfully imported into finite element software for analysis. All the models demonstrated reasonable and stable solutions when subjected to realistic applied loads. Conclusions A rapid, low-cost, and user-friendly phenotyping methodology was developed to quantify two-dimensional plant cross-sections. The methodology offers reduced sample preparation time and cost as compared to previously developed techniques. The new methodology employs a stereoscope and a semi-automated image processing algorithm. The algorithm can be used to produce specimen-specific, dimensionally accurate computational models (including finite element models) of plant stalks.

scholarly journals Evaluation of Root Lodging Resistance in Soybean (Glycine max(L.)Merr.) Cultivars by Measurement of Pushing Resistance and Top Weight Moment.

2002 ◽  
Vol 4 (4) ◽  
pp. 185-191 ◽  
Author(s):  
Hisanori Shimada ◽  
Yuhi Kono ◽  
Yoshitake Takada ◽  
Tetsufumi Sakai ◽  
Shinji Shimada
Keyword(s):  
Glycine Max ◽  
Lodging Resistance ◽  
Glycine Max L ◽  
Root Lodging

scholarly journals Initial material for solving the main problems encountered in breeding winter rye in the northwestern zone of the USSR

1988 ◽  
Vol 60 (4) ◽  
pp. 215-221 ◽  
Author(s):  
V. D. Kobylyanskij
Keyword(s):  
Disease Resistance ◽  
Grain Quality ◽  
Yield Potential ◽  
High Yield ◽  
Winter Rye ◽  
Lodging Resistance ◽  
Dominant Type ◽  
Northwestern Region ◽  
New Varieties ◽  
The Stability

The main problems encountered in breeding winter rye in the northwestern region are: winterhardiness, lodging resistance, disease resistance and grain quality. Winterhardiness in the northwest of the USSR depends on the resistance of rye to snow mould. Varieties from the USSR (Vyatka, Falenskaja, Udinskaja, Narymskaja 23 and some others) and Austria (Lungauer Tauern, Schlager) as well as many varieties from Finland present valuable material for breeding for winterhardiness. The breeding of short-strawed varieties was promoted considerably by the use of donors with the dominant type of inheritance of the short straw characteristic (EM-1, k-10028) and many forms and varieties created on their basis. Nine commercial varieties with a high yield potential and winterhardiness were bred. Short-strawed donors resistant to powdery mildew and brown rust (Imering 4, Fletera 2, Immunnaja 5), unique in their kind and very valuable, were bred by introgression of the genes for resistance, which had been discovered in the populations of wild species and older varieties. A strategy of breeding rye for disease resistance is suggested. In breeding to improve grain quality, a gene bank of varieties, in which the stability of high grain quality is retained, is valuable. Some varieties have a protein content in the grain of 10 %, with a lysine content in the protein of 4 % or more (Marienhofer, Wieselburger, Kisvardai). Four short-strawed analogues of commercial varieties (Ural’skaja HI, Tchishminskaja HI, Kustro HI, Stalrug HI) are close to the variety Otello as to their baking qualities. The material presented on the inheritance of characteristics contributes to the selection of donors when new varieties are bred.

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