scholarly journals Alfalfa variety selection for maximum fiber content, protein and nitrogen fixation

2012 ◽  
Author(s):  
Christopher T. Ruhland ◽  
John Knox ◽  
Susan Ward ◽  
V. J. Agarwal ◽  
John Frey ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Fiber Content ◽  
Variety Selection ◽  
Selection For

scholarly journals Mixed modeling for fiber yield genetic selection in sugarcane

2021 ◽  
Vol 53 (2) ◽  
pp. 11-19
Author(s):  
João de Andrade Dutra Filho ◽  
Lauter Silva Souto ◽  
Rômulo Gil De Luna ◽  
Anielson dos Santos Souza ◽  
Frank Gomes Silva ◽  
...  
Keyword(s):  
Linear Models ◽  
Genetic Selection ◽  
Fiber Content ◽  
Sucrose Content ◽  
Mixed Linear Models ◽  
High Fiber ◽  
Sugarcane Crop ◽  
Commercial Cultivation ◽  
Selection For ◽  
Harmonic Means

The current demand for clean and renewable energy has provoked considerable changes in the production system of agroindustrial companies. The generation of bioelectricity through the burning of sugarcane bagasse has considerably risen in the recent years. This work aimed to focus on the sugarcane genotypes selection for fiber productivity. The experiment was outlined in randomized blocks with four repetitions, and sixteen genotypes were evaluated. The evaluated traits  were: cane tons per hectare, sucrose tons per hectare, fiber tons per hectare, fiber content and apparent sucrose content. To the selection, the mixed linear models methodology was used. The heritability coefficients suggest a significant genetic gain and the harmonic means of relative performances of predicted genotypic values allowed the identification of stable genotypes related to the traits evaluated in four harvest cycles. Considering the current average demand of sugarcane agroindustry for varieties with fiber content between 12% and 17% and sucrose content near 13%, for energy generation and sugar production, the genotypes EECAC 06, EECAC 03, EECAC 04 and EECAC 07 are presented as commercial cultivation options. Highlights - Mixed models constitute an efficient tool for sugarcane selection focused onto fiber and sucrose production. - This methodology provides significant genetic gains based on predicted genetic values free from interaction with harvest cycles. - The evaluated genotypes present high fiber and sucrose productivity, genotypic adaptability and stability throughout harvest cycles, indicating longevity in the sugarcane crop.

Xerohalophyte semishrub Kochia prostrata — variety selection for arid land reclamation

2020 ◽  
Author(s):  
Н. Шамсутдинов ◽  
Г. Кенжегалиев
Keyword(s):  
Land Reclamation ◽  
Animal Husbandry ◽  
Dry Mass ◽  
Biological Traits ◽  
High Productivity ◽  
Early Maturation ◽  
Fodder Production ◽  
Variety Selection ◽  
Green Fodder ◽  
Selection For

Исследования проводились в 20092019 годах в Казахском научно-исследовательском институте животноводства и кормопроизводства. Изучение и отбор различных образцов кохии простёртой в коллекционных питомниках, контрольные и конкурсные испытания позволили поэтапно выявить перспективные генотипы, обладающие высокой скоростью отрастания и высокорослостью, которые в дальнейшем использовались для создания сортов пастбищного и сенокосного типа. При изучении исходного материала были выявлены различия между зеленоватым и серым подвидами кохии по многим морфобиологическим признакам. При этом зеленоватый подвид характеризовался раннеспелостью и хорошим отрастанием, обуславливающими его пастбищное использование. Серый подвид был более пригоден для производства сена, сочетая в себе высокорослость, прямостоячесть и позднеспелость. В процессе селекции пастбищных форм было выявлено преимущество образцов северо-туранских каменистых экотипов. Образцы К-210, К-211 и К-510, К-521, имея облиственность 69710, были наиболее продуктивными 1,331,40 и 1,321,34 т/га соответственно. При создании сортов сенокосного типа наиболее перспективными оказались песчаные экотипы, имея высоту 7174 см, облиственность 5457, высокое содержание протеина (1214) и урожайность сена 2,803,26 т/га. На основе образца К-210, превосходящего стандарт по сбору сухой массы на 34,3, был получен сорт Пастбищный, обладающий высотой 62 см, тонкостебельностью и высокой облиственностью (70). Сорт характеризовался повышенной устойчивостью к болезням, хорошим отрастанием, засухоустойчивостью и зимостойкостью. Для получения сорта для сенокосного использования был отобран образец песчаного экотипа К-513, превысивший по урожайности стандарт на 31. Высота растения составила 77,7 см, облиственность 5458, форма куста прямостоячая, позволяющая проводить уборку наиболее ценных в кормовом отношении частей куста. The investigation took place at the Kazakh Research Institute of Animal Husbandry and Fodder Production in 20092019. Promising genotypes of Kochia prostrata were used to develop varieties for green fodder and hay production. Green and grey subspecies showed variation in many morphological and biological traits. The green subspecies was more suitable for pasture use due to its early maturation and fast aftergrowth, while tall-grown upright long-season grey subspecies for hay production. Genotypes K-210, K-211 and K-510, K-521 had leaf coverage of 69710 and high productivity 1.331.40 and 1.321.34 t ha-1, respectively. Sandy ecotypes were used to produce hay. Their height reached 7174 cm, leaf coverage 5457, protein content 1214 and hay yield 2.803.26 t ha-1. Genotype К-210 was used to develop the variety Pastbishchnyy, exceeding the standard in dry mass by 34.3. Its height reached 62 cm, leaf coverage 70, stem thin. The variety had high resistance to diseases, drought and frost as well as good aftergrowth. To develop a variety for hay production purposes К-513 line was selected exceeding the standard in productivity by 31. Plant height was 77.7 cm, leaf coverage 5458. Upright shrub type enabled harvesting the most valuable parts.

Bidirectional Selection for Nitrogenase Activity and Shoot Dry Weight Among Late Generation Progenies of a Virginia x Spanish Peanut Cross1

1986 ◽  
Vol 13 (2) ◽  
pp. 86-89 ◽  
Author(s):  
S. Arrendell ◽  
J. C. Wynne ◽  
G. H. Elkan ◽  
T. J. Schneeweis
Keyword(s):  
Nitrogen Fixation ◽  
Plant Growth ◽  
Growth Habit ◽  
Nitrogenase Activity ◽  
Dry Weight ◽  
Fruit Weight ◽  
Shoot Dry Weight ◽  
Plant Growth Habit ◽  
The Mean ◽  
Selection For

Abstract Improvement of the host contribution to nitrogen fixation has been proposed as a method of increasing nitrogen fixation. Significant variability and generally high broad-sense heritability estimates (.60 ± .27 to .82 ± .26 for nitrogenase activity and .53 ± .29 to .85 ± .26 for shoot dry weight) have been reported for F2-derived families from a cross between the Virginia (Arachis hypogaea L. ssp. hypogaea var. hypogaea) cultivar NC 6 and the Spanish (ssp. fastigiata Waldron vulgaris Harz.) breeding line 922, indicating selection for increased nigtogen fixation should be effective in this population. Lines from this population were chosen randomly from F2-derived families selected for high and low nitrogenase activity and high and low shoot dry weight after evaluation at three dates and two locations in each of 2 years (F5 and F6 generations). This study's objectives were to evaluate the N2-fixing ability of the selected lines and to evaluate the association between plant growth habit and N2 fixation. Twenty-four lines in each of the four selection groups and the parents, NC 6 and 922, were evaluated at two sampling dates and two locations. Mean nitrogenase activity of lines selected for increased nitrogenase activity was significantly greater than the mean of the lines selected for low nitrogenase activity. Improved nitrogenase activity was associated with increased fruit weight. The fruit weight mean of the group selected for increased fruit weight. The fruit weight mean of the group selected for increased nitrogenase activity was 39% greater than the mean of the group selected for low nitrogenase activity. Mean shoot dry weight of lines selected for increased shoot dry weight was significantly greater than the mean of the lines selected for low shoot dry weight; however, the fruit weight means of these two groups did not differ. It was hypothesized that selection for increased N2 fixation in a population derived from a cross between Virginia and Spanish types would eliminate genotypes with Spanish growth habit. Groups selected for high nitrogenase activity and for high shoot dry weight had longer and wider leaflets, longer cotyledonary laterals and greater main stem height than did their respective low selection groups. However, these traits chosen to characterize plant growth habit were inadequate in discriminating parental growth habits. Consequently, the data neither substantiated nor refuted the hypothesis.

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