Seed Longevity and Its Association with Agronomic Traits in Soybean [Glycine max (L.) Merrill]

2021 ◽  
Author(s):  
Shreya Singh ◽  
Rajesh Kanwar ◽  
R.K. Kapila ◽  
K.C. Dhiman
Keyword(s):  
Agronomic Traits ◽  
Strong Association ◽  
Selection Criterion ◽  
Germination Percentage ◽  
Indirect Selection ◽  
Seed Longevity ◽  
Oilseed Crop ◽  
Ambient Conditions ◽  
Time Period ◽  
Poor Seed

Background: Soybean is an important oilseed crop but it has poor seed longevity. Studies on seed longevity are very complex and hence, an indirect selection criterion should be identified. In this study, seed longevity and its association with agronomic traits of seven soybean varieties was evaluated in the year 2019-2020.Methods: Seed were kept for storage under ambient conditions for a period of 16 months (January 2019 to May 2020). Their germination was recorded at bimonthly intervals and seed longevity was inferred as the time period in months up to which the seed maintains its germination percentage above IMSCS.Result: Accordingly, Palam Early Soya 1 and Him Palam Hara Soya were classified as having short seed longevity (12 months). Hara Soya, Shivalik, Him Soya and Palam Soya were classified as having medium seed longevity (14 months). Whereas, PS 1556 was classified as having long seed longevity ( greater than 16 months). Further, it was found that seed longevity was positively associated with number of pods per plant and seed yield, and negatively associated with number of branches per plant and 100-seed weight. This study presents an indirect selection criterion based on some easily accessible parameters which have strong association with seed longevity.

scholarly journals Supporting Physiological Trait for Indirect Selection for Grain Yield in Drought-Stressed Popcorn

Plants ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1510
Author(s):  
Samuel Henrique Kamphorst ◽  
Gabriel Moreno Bernardo Gonçalves ◽  
Antônio Teixeira do Amaral Júnior ◽  
Valter Jário de Lima ◽  
Kátia Fabiane Medeiros Schmitt ◽  
...  
Keyword(s):  
Grain Yield ◽  
Multiple Regression ◽  
Morphological Traits ◽  
Vegetation Index ◽  
Agronomic Traits ◽  
Indirect Selection ◽  
Leaf Angle ◽  
Water Restriction ◽  
Leaf Greenness ◽  
Selection Of

The identification of traits associated with drought tolerance in popcorn is a contribution to support selection of superior plants under soil water deficit. The objective of this study was to choose morphological traits and the leaf greenness index, measured on different dates, to estimate grain yield (GY) and popping expansion (PE), evaluated in a set of 20 popcorn lines with different genealogies, estimated by multiple regression models. The variables were divided into three groups: morpho-agronomic traits—100-grain weight (GW), prolificacy (PR), tassel length (TL), number of tassel branches, anthesis-silking interval, leaf angle (FA) and leaf rolling (FB); variables related to the intensity of leaf greenness during the grain-filling period, at the leaf level, measured by a portable chlorophyll meter (SPAD) and at the canopy level, calculated as the normalized difference vegetation index (NDVI). The inbred lines were cultivated under two water conditions: well-watered (WW), maintained at field capacity, and water stress (WS), for which irrigation was stopped before male flowering. The traits GY (55%) and PE (28%) were most affected by water restriction. Among the morpho-agronomic traits, GW and PR were markedly reduced (>10%). Under dry conditions, the FA in relation to the plant stalk tended to be wider, the FB curvature greater and leaf senescence accelerated (>15% at 22 days after male flowering). The use of multiple regression for the selection of predictive traits proved to be a useful tool for the identification of groups of adequate traits to efficiently predict the economically most important features of popcorn (GY and PE). The SPAD index measured 17 days after male flowering proved useful to select indirectly for GY, while, among the morphological traits, TL stood out for the same purpose. Of all traits, PR was most strongly related with PE under WS, indicating its use in breeding programs. The exploitation of these traits by indirect selection is expected to induce increments in GY and PE.

scholarly journals Selection strategies in agronomic characters in progenies F3:4 of transgenic soy RR

2021 ◽  
Vol 45 ◽  
Author(s):  
Anna Regina Tiago Carneiro ◽  
Osvaldo Toshiyuki Hamawaki ◽  
Ana Paula Oliveira Nogueira ◽  
Arthur Felipe Eustáquio e Silva ◽  
Raphael Lemes Hamawaki ◽  
...  
Keyword(s):  
Agronomic Traits ◽  
Indirect Selection ◽  
Direct Selection ◽  
Selection Strategies ◽  
Aggregate Information ◽  
Genetic Potential ◽  
Superior Genotypes ◽  
Selection Indexes ◽  
Total Gain ◽  
Selection Of

ABSTRACT The selection indexes aggregate information to multiple characters and, with this, they are able to carry out the selection of a set of variables simultaneously. The objective was to verify the genetic potential of agronomic traits and to select soybean F3:4 progenies based on different selection strategies. 123 progenies and the parents were sown in randomized blocks with two replications. The gains of direct selection by the indexes, the sum of “ranks” and the genotype-ideotype were lower for all characters when compared to the gains of direct and indirect selection. The rank sum index stood out for achieving the highest total gain with 37.11%. The index of the genotype-ideotype obtained a lower gain (-0.48%) for the character number of days for flowering compared to the sum index of “ranks” (-0.54%) and reached a negative gain for the attribute insertion height of the first pod with -1.82%. The genetic potential of the F3:4 population is high and allows different selection strategies to be applied to reach superior genotypes. The progenies UFU 72, UFU 116, UFU 86, UFU 45, UFU 117, UFU 56, UFU 5, UFU 106, UFU 6, UFU 4, UFU 73, UFU 101, UFU 96, UFU 90, UFU 123, UFU 116, UFU 88, UFU 65, UFU 70, UFU 3, UFU 69 and UFU 37 were selected by both selection indexes. The UFU 72, UFU 90, UFU 88 and UFU 69 progenies are agronomically superior both in direct and indirect selection, as in Mulamba and Mock (1978) sum of “ranks” selections and genotype-ideotype.

scholarly journals Comparison between non-parametric indexes in the selection of biofortified curly lettuce

2020 ◽  
Vol 11 ◽  
pp. e3351
Author(s):  
Joicy Vitória Miranda Peixoto ◽  
Gabriel Mascarenhas Maciel ◽  
Ana Carolina Silva Siquieroli ◽  
Lucas Medeiros Pereira ◽  
José Magno Queiroz Luz ◽  
...  
Keyword(s):  
Agronomic Traits ◽  
Indirect Selection ◽  
Stem Diameter ◽  
Anthocyanin Content ◽  
Grand Rapids ◽  
Commercial Cultivars ◽  
Lettuce Breeding ◽  
Selection Indexes ◽  
Leaf Lettuce ◽  
Selection Of

Selection indexes can be applied to simultaneous analysis of traits, increasing the efficiency of breeding in choosing the genotypes that meet the needs of both the market and the consumer. While it is a technic applied to several cultures, there are few studies about it in lettuce lines. For this reason, the aim of this study was to comparate assess the efficiency of different selection indexes for selecting biofortifiedleaf lettuce lines with good agronomic traits. The experiment was carried out at the Estação Experimental de Hortaliças of Federal University of Uberlândia (UFU), campus Monte Carmelo, in 2018. The experiment was designed in full randomized blocks of 3 repetitions with 25 leaf lettuce genotypes (22 lines from cultivars Pira 72 versus Uberlândia 10000 and 3 commercial cultivars – cv. Grand Rapids, UFU-Biofort and Uberlândia 10000). The lines are part of the UFU biofortified lettuce breeding program and were assessed for the total green mass (g), the stem diameter (cm), commercial leaves count, plant diameter (cm), foliar temperature (°C), SPAD index, anthocyanin content (mg 100g-1 sample), and bolting (days after sowing). To estimate selection gains, 10 genotypes were selected using both direct and indirect selection, as well as the traditional index, the sum of ranks index, Willians base index, and the multiplicative index. Mulamba and Mock sum of ranks index and Subandi multiplicative index provided the biggest total gains for the traits assessed in biofortified leaf lettuce. Both indexes were similar in selecting genotypes.

scholarly journals Germination Patterns in Seeds Produced in Apical and Basal Fruits of Two Thlaspi arvense Populations

Agronomy ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 756
Author(s):  
Eva Edo-Tena ◽  
Russ W. Gesch ◽  
Aritz Royo-Esnal
Keyword(s):  
Germination Percentage ◽  
Temperate Climate ◽  
Oilseed Crop ◽  
Seed Selection ◽  
Thlaspi Arvense ◽  
Production Site ◽  
Field Pennycress ◽  
Selection For ◽  
The One ◽  
Two Populations

The aim of the present work is to study possible differences in the germination behavior of apical and basal seeds (produced in the upper and lower fruits of the infruitescence), of two populations of field pennycress (Thlaspi arvense), both produced in a Mediterranean and a continental temperate climate. The results showed that among the three studied factors (population, seed type, production site), only the production site was relevant for the total germination, germinating those produced in Morris in a greater amount than those produced in Lleida. Germination models could be applied only to seeds produced at Morris (>10% germination), and despite the lack of differences in the total germination percentage, germination rates (speed—b parameter—and time to 50% germination—G50) differed between population and seed types—apical seeds from the Spanish population germinated faster (lower b parameter) than the rest, while apical seeds of both populations germinated faster than the corresponding basal seeds (lower G50). The results show, on the one hand, the importance of the seed production site if this species was considered as a commercial oilseed crop and, on the other hand, differences that will help seed selection for seed germination and establishment improvement of pennycress.

scholarly journals Thirty-year monitoring and statistical analysis of 50 species' germinability in genebank medium-term storage suggest specific characteristics in seed longevity

2020 ◽  
Vol 48 (2) ◽  
pp. 269-287
Author(s):  
Fukuhiro Yamasaki ◽  
Eiji Domon ◽  
Norihiko Tomooka ◽  
Akiko Baba-Kasai ◽  
Hiroshi Nemoto ◽  
...  
Keyword(s):  
Survival Curve ◽  
Germination Percentage ◽  
Seed Longevity ◽  
Panicum Maximum ◽  
Test Results ◽  
Interspecific Differences ◽  
Kaplan Meier ◽  
The Common ◽  
Censored Observations ◽  
Term Storage

A total of 401,293 germination test results accumulated over 30 years for 110,819 seed lots of 50 species and 4 sub-species stored at –1°C and 30% relative humidity was analysed to assess seed longevity. The Kaplan- Meier estimator was used to perform comprehensive analysis, including censored observations due to seed lot regeneration or substitution. The Weibull distribution was used to model the observed and censored death times for each survival curve and its parameters were used as the common indicator. Interspecific differences in seed longevity, the time until the germination percentage falls below 85% of its initial value, were observed. The shortest and longest seed longevity periods were 8.4 and 127.1 years for Panicum maximum and Cucumis sativus, respectively. Moreover, intra-specific differences in seed longevity were observed at different levels of domestication and geographical distribution of origin. For example, the average seed longevity of six-row Hordeum vulgare landraces that originated from southern Europe showed 2.5 times that of the average of this species. Here, reference materials for setting appropriate intervals of germination testing are presented.

Fleece rot and body strike in Merino sheep. IV. Experimental evaluation of traits related to greasy wool colour for indirect selection against fleece rot

1990 ◽  
Vol 41 (1) ◽  
pp. 139 ◽  
Author(s):  
HW Raadsma ◽  
BR Wilkinson
Keyword(s):  
Fibre Diameter ◽  
Selection Criterion ◽  
Indirect Selection ◽  
Objective Measurement ◽  
Genetic Potential ◽  
Wool Yield ◽  
Fleece Weight ◽  
Colour Development ◽  
The Cost

The potential for using indicators of greasy wool colour as indirect criteria for selection of sheep genetically resistant to fleece rot and body strike was examined. Nine traits based on the subjective grading of wool samples (1 trait), objective reflectance (6 traits) and colour development during incubation (2 traits) were evaluated for their genetic potential, ease and reliability of measurement, and relationship with other major production characteristics. The colour of wool was assessed in 949 Merino ewe hoggets representing the progeny of 134 sires before the induction of fleece rot. All colour traits were moderately heritable, ranging from 0.25 � 0.13 for subjective colour score to 0.40 � 0.14 (h2�.s.e.) for an objective reflectance index. Based on the combined estimate of the heritability of the indicator trait and its genetic correlation with fleece rot, indices based on the objective measurement of colour reflectance and colour development following incubation showed the highest genetic potential for indirect selection. Objective measurement of colour reflectance also showed a high genetic potential for indirect selection against body strike. Subjective colour assessment prior to the induction of fleece rot showed the lowest potential for indirect selection against both fleece rot and body strike. The cost of objective measurement of colour was less than that of colour development during incubation, and the former was found to be the most reliable indirect selection criterion in this experiment. A consequence of selecting solely for decreased greasy wool colour on other production characters is likely to result in decreased fibre diameter, increased wool yield, with a potentially small decrease in greasy fleece weight. Further evaluation of colour indicators as additional selection criteria should first focus on the likely role of fleece rot and body strike resistance as part of (national) breeding objectives. Only then can the full impact of using colour variables on the overall breeding aggregate be established.

scholarly journals Changes in stem and spike related traits resulting from breeding in Iranian wheat cultivars: associations with grain yield

2017 ◽  
Vol 53 (No. 3) ◽  
pp. 107-113
Author(s):  
M. Joudi ◽  
A. Ahmadi ◽  
V. Mohammadi
Keyword(s):  
Grain Yield ◽  
Selection Criterion ◽  
Dry Weight ◽  
Grain Filling ◽  
Specific Weight ◽  
Indirect Selection ◽  
Wheat Cultivars ◽  
Terminal Drought ◽  
Positive Correlations ◽  
Terminal Drought Stress

This study investigated changes in stem and spike characteristics resulting from breeding in Iranian wheat cultivars, and their relationship with grain yield. Eighty-one wheat cultivars released between 1930 and 2006 were examined under well-watered (WW) and terminal drought stress (DS) conditions in Karaj during 2007–2008 and 2008–2009 and under WW condition at Parsabad in Moghan region during 2010–2011. A genetic improvement over time in stem specific weight (SSW) along with significant positive correlations between this trait and grain yield were found at Karaj under DS conditions and at Parsabad, suggesting that SSW could be used as an indirect selection criterion for yield in these environments. Time-dependent changes in spike dry weight showed that the magnitude of partitioned photoassimilates to the spike during the phase anthesis – 16 days after anthesis (16 DAA) was not changed by breeding. However, during the 16 DAA ‒ maturity phase, modern cultivars had more photoassimilates allocated to the spike than the old ones. This suggests that the sink is more limited during early grain growth than during the end of grain filling. 

Genetic diversity of safflower (Carthamus tinctorius L.) germplasm as revealed by SSR markers

2015 ◽  
Vol 15 (1) ◽  
pp. 1-11 ◽  
Author(s):  
B. Usha Kiran ◽  
N. Mukta ◽  
P. Kadirvel ◽  
K. Alivelu ◽  
S. Senthilvel ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Seed Yield ◽  
Edible Oils ◽  
Agronomic Traits ◽  
Allelic Variation ◽  
Fatty Acid Content ◽  
Bootstrap Support ◽  
Oilseed Crop ◽  
Core Subset

Safflower is a multi-purpose oilseed crop, primarily known for good quality oil containing highest polyunsaturated fatty acid content (>80%) among edible oils. In this study, a core subset of 148 safflower accessions representing 15 countries, predominantly of Indian origin, was evaluated for agronomic traits and characterized for genetic diversity, population structure and linkage disequilibrium (LD) using 44 simple sequence repeat (SSR) loci across 11 linkage groups to enable its utilization in breeding and genetic mapping purposes. The collection had substantial variation for seed yield-related traits. SSR allelic variation was low as indicated by average number of alleles (3.6) per locus, gene diversity (0.314) and polymorphism information content (0.284). Cluster analysis (neighbour-joining tree) revealed five major genotypic groups with very low bootstrap support. STRUCTURE analysis showed recognizable population structure; based on membership coefficients ( ≥ 0.75), 52% accessions were classified into four populations (K= 4) and the remaining 48% accessions into admixture group. High Fst values (0.30–0.48) suggested that the populations were substantially differentiated. Analysis of molecular variance results showed that maximum of genetic variation (85%) was explained between individuals within the population suggesting that the population structure was only weak. About 1.9% of SSR locus pairs were in LD, which appeared to be low. High phenotypic variation, mild population structure and low level of LD among unlinked loci suggested that the core subset can be explored for association mapping of seed yield components in safflower.

Ruminant enteric methane mitigation: a review

2011 ◽  
Vol 51 (6) ◽  
pp. 491 ◽  
Author(s):  
D. J. Cottle ◽  
J. V. Nolan ◽  
S. G. Wiedemann
Keyword(s):  
Greenhouse Gas ◽  
Feed Intake ◽  
National Level ◽  
Selection Criterion ◽  
Cost Effective ◽  
Indirect Selection ◽  
Feed Additives ◽  
Future Price ◽  
Economic Modelling ◽  
Management Options

In Australia, agriculture is responsible for ~17% of total greenhouse gas emissions with ruminants being the largest single source. However, agriculture is likely to be shielded from the full impact of any future price on carbon. In this review, strategies for reducing ruminant methane output are considered in relation to rumen ecology and biochemistry, animal breeding and management options at an animal, farm, or national level. Nutritional management strategies have the greatest short-term impact. Methanogenic microorganisms remove H2 produced during fermentation of organic matter in the rumen and hind gut. Cost-effective ways to change the microbial ecology to reduce H2 production, to re-partition H2 into products other than methane, or to promote methanotrophic microbes with the ability to oxidise methane still need to be found. Methods of inhibiting methanogens include: use of antibiotics; promoting viruses/bacteriophages; use of feed additives such as fats and oils, or nitrate salts, or dicarboxylic acids; defaunation; and vaccination against methanogens. Methods of enhancing alternative H2 using microbial species include: inoculating with acetogenic species; feeding highly digestible feed components favouring ‘propionate fermentations’; and modifying rumen conditions. Conditions that sustain acetogen populations in kangaroos and termites, for example, are poorly understood but might be extended to ruminants. Mitigation strategies are not in common use in extensive grazing systems but dietary management or use of growth promotants can reduce methane output per unit of product. New, natural compounds that reduce rumen methane output may yet be found. Smaller but more permanent benefits are possible using genetic approaches. The indirect selection criterion, residual feed intake, when measured on ad libitum grain diets, has limited relevance for grazing cattle. There are few published estimates of genetic parameters for feed intake and methane production. Methane-related single nucleotide polymorphisms have yet to be used commercially. As a breeding objective, the use of methane/kg product rather than methane/head is recommended. Indirect selection via feed intake may be more cost-effective than via direct measurement of methane emissions. Life cycle analyses indicate that intensification is likely to reduce total greenhouse gas output but emissions and sequestration from vegetation and soil need to be addressed. Bio-economic modelling suggests most mitigation options are currently not cost-effective.

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