scholarly journals Field Screening of Wheat Advanced Lines for Salinity Tolerance

Agronomy ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 281
Author(s):  
Ehab S. A. Moustafa ◽  
Mohamed M. A. Ali ◽  
Mohamed M. Kamara ◽  
Mohamed F. Awad ◽  
Abdallah A. Hassanin ◽  
...  
Keyword(s):  
Genetic Variability ◽  
Salinity Stress ◽  
Agronomic Traits ◽  
Saline Water ◽  
Salt Tolerant ◽  
Breeding Lines ◽  
Pedigree Selection ◽  
Genetic Pool ◽  
Global Population ◽  
Stressed Field

Salinity in soil or irrigation water requires developing genetically salt-tolerant genotypes, especially in arid regions. Developing salt-tolerant and high-yielding wheat genotypes has become more urgent in particular with continuing global population growth and abrupt climate changes. The current study aimed at investigating the genetic variability of new breeding lines in three advanced generations F6–F8 under salinity stress. The evaluated advanced lines were derived through accurate pedigree selection under actual saline field conditions (7.74 dS/m) and using saline water in irrigation (8.35 dS/m). Ninety-four F6 lines were evaluated in 2017–2018 and reduced by selection to thirty-seven F7 lines in 2018–2019 and afterward to thirty-four F8 lines in 2019–2020 based on grain yield and related traits compared with adopted check cultivars. Significant genetic variability was detected for all evaluated agronomic traits across generations in the salt-stressed field. The elite F8 breeding lines displayed higher performance than the adopted check cultivars. These lines were classified based on yield index into four groups using hierarchical clustering ranging from highly salt-tolerant to slightly salt-tolerant genotypes, which efficiently enhance the narrow genetic pool of salt-tolerance. The detected response to selection and high to intermediate broad-sense heritability for measured traits displayed their potentiality to be utilized through advanced generations under salinity stress for identifying salt-tolerant breeding lines.

scholarly journals Association Analysis of Molecular Markers with Essential Agronomic Traits under Normal and Salt Stress in Wide Germplasm of Foxtail Millet (Setaria Italica L.)

2021 ◽  
Author(s):  
Mehdi Yazdizadeh ◽  
Ghasem Mohammadi-Nejad ◽  
Leila Fahmideh ◽  
Fatemeh Ebrahimi ◽  
Mahmood Solouki ◽  
...  
Keyword(s):  
Genetic Variability ◽  
Association Analysis ◽  
Salinity Stress ◽  
Agronomic Traits ◽  
Foxtail Millet ◽  
Diversity Indices ◽  
Stress Conditions ◽  
Wide Range ◽  
Arid And Semiarid Areas ◽  
Food Security And Nutrition

Abstract Food security and nutrition concerns are putting an ancient, climate-smart grain back on our plates; Farm to fork, there has been a revival of interest in millet. Foxtail millet, as a multi-purpose product, has nutritious and medicinal potentials. This research is aimed at identifying combined markers as well as stable associations between such markers and the investigated agronomic traits in a wide range of foxtail millet germplasms under normal and salinity-stress conditions. In this context, association analysis has been conducted among 14 agronomic traits and 331 polymorphic AFLP markers generated by 12 primer combinations in 134 foxtail millet genotypes. Based on the analysis of population structure, the foxtail millet genotypes were divided into six subpopulations. The results showed that a number of markers had stable and significant associations under both normal and salinity-stress conditions with agronomic traits. The primer combinations had high polymorphic percentage, diversity indices were highly reliable and revealed significant genetic variability among the genotypes. Their PIC, MI and Shannon’s indices were also highly reliable and revealed significant genetic variability among the genotypes. Since the markers introduced in this research have stable and strong associations with the investigated traits under normal and salinity stress conditions, they can be suitable candidates’ in future marker-assisted breeding to improve salinity- resistance genotypes of foxtail millet in arid and semiarid areas.

scholarly journals Genetic Variability, Correlation and Path Analysis among Quantitative and Qualitative Traits of Opium Poppy (Papaver somniferum L.)

2020 ◽  
Author(s):  
Namita Singh ◽  
V. R. Singh ◽  
K. T. Venkatesha ◽  
Arvind Kumar Singh ◽  
R. K. Lal
Keyword(s):  
Genetic Variability ◽  
Path Analysis ◽  
Agronomic Traits ◽  
Chemical Constituents ◽  
Papaver Somniferum ◽  
Opium Poppy ◽  
Block Designs ◽  
Medicinal And Aromatic Plants ◽  
Breeding Lines ◽  
Opium Alkaloids

Background: The poppy seeds commonly known as ‘khus-khus’ or ‘postadana’, obtained from opium poppy plant (Papaver somniferum L.) is known one of the world’s oldest medicinal plant. Its alkaloids, seeds and oil used since time immemorial for therapeutic, food stuffs and economical purpose. An effective breeding program plays an important role for selection, genetic improvement and development of high yielding cultivars/variety in opium poppy. Therefore, a study was conceded out to evaluate the genetic variability, path analysis for different agronomic traits along with their major chemical constituents of opium alkaloids in 30 accessions/landraces of opium poppy (Papaver somniferum L.) collected from different geographical places of India. Methods: The 30 genotypes of Opium poppy including different breeding lines and landraces collected from different places were grown in year (2017-18) in randomized complete-block designs (RCBD) with three replications at the research farm of CSIR-Central Institute of Medicinal and Aromatic Plants (CIMAP), Lucknow. Morpho-metric data were recorded on five competitive randomly selected plants in each line for following thirteen traits. Dried husk/straw capsules were chemically analyzed through HPLC. The pooled mean data were statistically analysed by using Windostat statistical software 4.0 versions available at Department of Genetics and Plant Breeding, CSIR-CIMAP Lucknow. Result: Variation among the mean of thirty diverse genetic stocks was highly significant (p less than 0.01) for all thirteen traits. High heritability coupled with high Genetic advance as percent mean (GAM) and Genotypic coefficient of variation (GCV) for the traits Thebaine and Nosacapine. The results of associations studies revealed that the trait capsule/plant was positively and significantly correlated with seed (g)yield/plant (gm) and nosacapine at both genotypic and phenotypic level. According to results, a significant genetic variability was also present among 30 accessions, simple selection can be employed to improve seed yield along with alkaloids yield.

scholarly journals Effects of Salinity and Rootstock on Nutrient Element Concentrations and Physiology in Own-Rooted or Grafted to 1103 P and 101-14 Mgt Rootstocks of Merlot and Cabernet Franc Grapevine Cultivars under Climate Change

2021 ◽  
Vol 13 (5) ◽  
pp. 2477
Author(s):  
Kleopatra-Eleni Nikolaou ◽  
Theocharis Chatzistathis ◽  
Serafeim Theocharis ◽  
Anagnostis Argiriou ◽  
Stefanos Koundouras ◽  
...  
Keyword(s):  
Salinity Stress ◽  
Saline Water ◽  
Chlorophyll Concentration ◽  
Co2 Assimilation ◽  
Significant Rise ◽  
Nutrient Concentrations ◽  
Salt Treatment ◽  
Cabernet Franc ◽  
Mediterranean Regions ◽  
Climate Crisis

Under the current and future climate crisis, a significant rise in soil salinity will likely affect vine productivity in several Mediterranean regions. During the present research, the rootstock effects on salinity tolerance of Merlot and Cabernet Franc grapevine cultivars were studied. In a pot hydroponic culture, own-rooted Merlot and Cabernet Franc grapevine cultivars or grafted onto the rootstocks 1103 P and 101-14 Mgt were drip-irrigated with saline water. A completely randomized 3 × 2 × 2 factorial experiment was designed with two vine rootstocks or own-rooted vines, two scion cultivars, and 100 mM NaCl salinity or control treatments, with six replications. A significant effect of scion cultivar, rootstock, and salinity was observed for most of the measured parameters. At the end of salinity stress period, leaf, shoot, root, and trunk nutrient concentrations were measured. Salinity stress increased Chloride (Cl−) and Sodium (Na+) concentrations in all parts of the vines and decreased leaf concentrations of Potassium (K+), Calcium (Ca+2), Magnesium (Mg+2), Nitrogen (N), and Iron (Fe). In contrast, salinity stress increased leaf Boron (B) concentrations, whereas that of Manganese (Mn) remained unaffected. Leaf chlorophyll concentration decreased from 42% to 40% after thirty and sixty days of salt treatment, respectively. A similar trend was observed for the CCM-200 relative chlorophyll content. Salinity significantly decreased steam water potential (Ws), net CO2 assimilation rate (A), and stomatal conductance(gs) in all cases of grafted or own-rooted vines. Sixty days after the beginning of salt treatment, total Phenolics and PSII maximum quantum yield (Fv/Fm) decreased significantly. The rootstock 1103 P seems to be a better excluder for Na+ and Cl− and more tolerant to salinity compared to 101-14 Mgt rootstock.

Transcriptional analysis of salt-responsive genes to salinity stress in three salt-tolerant and salt-sensitive Barely cultivars

2021 ◽  
Vol 141 ◽  
pp. 457-465
Author(s):  
Seyyed Abolghasem Mohammadi ◽  
Samira Hamian ◽  
Mohammad Moghaddam Vahed ◽  
Ali Bandehagh ◽  
Gholamreza Gohari ◽  
...  
Keyword(s):  
Salinity Stress ◽  
Transcriptional Analysis ◽  
Salt Tolerant

scholarly journals Antioxidative and Metabolic Contribution to Salinity Stress Responses in Two Rapeseed Cultivars during the Early Seedling Stage

Antioxidants ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1227
Author(s):  
Ali Mahmoud El-Badri ◽  
Maria Batool ◽  
Ibrahim A. A. Mohamed ◽  
Zongkai Wang ◽  
Ahmed Khatab ◽  
...  
Keyword(s):  
Salt Stress ◽  
Salinity Stress ◽  
Stress Responses ◽  
Antioxidant Activities ◽  
Tricarboxylic Acid Cycle ◽  
Seedling Stage ◽  
Plant Performance ◽  
Salt Tolerant ◽  
Brassica Napus L ◽  
Early Seedling

Measuring metabolite patterns and antioxidant ability is vital to understanding the physiological and molecular responses of plants under salinity. A morphological analysis of five rapeseed cultivars showed that Yangyou 9 and Zhongshuang 11 were the most salt-tolerant and -sensitive, respectively. In Yangyou 9, the reactive oxygen species (ROS) level and malondialdehyde (MDA) content were minimized by the activation of antioxidant enzymes such as superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), and ascorbate peroxidase (APX) for scavenging of over-accumulated ROS under salinity stress. Furthermore, Yangyou 9 showed a significantly higher positive correlation with photosynthetic pigments, osmolyte accumulation, and an adjusted Na+/K+ ratio to improve salt tolerance compared to Zhongshuang 11. Out of 332 compounds identified in the metabolic profile, 225 metabolites were filtrated according to p < 0.05, and 47 metabolites responded to salt stress within tolerant and sensitive cultivars during the studied time, whereas 16 and 9 metabolic compounds accumulated during 12 and 24 h, respectively, in Yangyou 9 after being sown in salt treatment, including fatty acids, amino acids, and flavonoids. These metabolites are relevant to metabolic pathways (amino acid, sucrose, flavonoid metabolism, and tricarboxylic acid cycle (TCA), which accumulated as a response to salinity stress. Thus, Yangyou 9, as a tolerant cultivar, showed improved antioxidant enzyme activity and higher metabolite accumulation, which enhances its tolerance against salinity. This work aids in elucidating the essential cellular metabolic changes in response to salt stress in rapeseed cultivars during seed germination. Meanwhile, the identified metabolites can act as biomarkers to characterize plant performance in breeding programs under salt stress. This comprehensive study of the metabolomics and antioxidant activities of Brassica napus L. during the early seedling stage is of great reference value for plant breeders to develop salt-tolerant rapeseed cultivars.

Phenetic relationships among different races of Striga gesnerioides (Willd.) Vatke from West Africa

Genome ◽  
2006 ◽  
Vol 49 (11) ◽  
pp. 1351-1365 ◽  
Author(s):  
Christopher J. Botanga ◽  
Michael P. Timko
Keyword(s):  
Genetic Variability ◽  
West Africa ◽  
Profile Analysis ◽  
Differential Resistance ◽  
Clustering Methods ◽  
Resistance Response ◽  
Breeding Lines ◽  
Root Hemiparasite ◽  
Striga Gesnerioides ◽  
Phenetic Relationships

Striga gesnerioides is a root hemiparasite that primarily parasitizes dicotyledonous species, including cowpea ( Vigna unguiculata L.) and other legumes. Based on the differential resistance response of various cultivars, landraces, and breeding lines, it has been proposed that several distinct races of cowpea-parasitic S. gesnerioides exist in West Africa. In this study, we used amplified fragment length polymorphism profile analysis to examine the genetic variability within and among populations of cowpea-parasitic S. gesnerioides within the suspected distribution range of a particular race, and statistical clustering methods to define the phenetic relationships of the various races in West Africa. Our data indicate that genetic variability within and among populations of each of the previously recognized races of cowpea-parasitic S. gesnerioides is extremely low. On the basis of genotypic profile and host differential resistance responses, 2 previously unknown races were identified. Of the 7 races now identifiable, races SG1 (from Burkina Faso) and SG5 (from Cameroon) are the most closely related, and SG4 (from Benin) and SG3 (from Niger/Nigeria) are the most divergent. SG6, a new race of the parasite identified in Senegal, was found to be the most genetically similar to SG4 from Benin. We also demonstrate that a hypervirulent isolate of the S. gesnerioides from Zakpota, in the Republic of Benin, is genotypically distinct from other populations of SG4, thereby warranting designation as a separate race, which we called SG4z. To further support our race classification scheme, we identified a group of molecular markers that effectively discriminate each of the various races. Finally, we show that an isolate (designated SG4i) of the wild legume Indigofera hirsuta –parasitic S. gesnerioides is genetically distinct and significantly diverged from the various races of cowpea-parasitic S. gesnerioides. Our data suggest that both geographic isolation and host-driven selection are critical factors defining race formation in S. gesnerioides in West Africa.

scholarly journals Evaluating the genetic variability of rubber hybrid progenies of the two crosses PB260 x RO44/71 and PB260 x RO62/54 by RAPD technique

2019 ◽  
Vol 2 (3) ◽  
pp. 36-43
Author(s):  
Thien Minh Nguyen ◽  
Tien Thi My Pham
Keyword(s):  
Genetic Variation ◽  
Genetic Variability ◽  
Genetic Similarity ◽  
Field Experiments ◽  
Agronomic Traits ◽  
Genetic Relationships ◽  
Genetic Material ◽  
Population Based ◽  
Shannon Index ◽  
Polymorphic Bands

The agronomic values of this population have been evaluated in the field experiments based on their phenotypic performance of agronomic traits, but the genetic variability of this population needs to be evaluated via techniques based on genetic material - DNA. In this study, the genetic variability in the investigated population of 71 hybrids and their parents was evaluated by RAPD technique, using eight selected arbitrarily primers; Genetic parameters and dendrogram expressing the genetic relationships among the investigated population were analyzed by GenALEx 6.1, Popgene 1.31 and NTSYSpc 2.1 softwares. Eight primers were used to generate the amplify products on each individual in the investigated population. From 74 genotypes, a total of 109 fragments were generated, among which, there were 89 polymorphic bands representing 81.65% with an average of 11 polymorphic bands/primer. Genetic similarity coefficient among the investigated population, based on DICE coefficient, ranged from 0.560 (LH05/0822 and PB260) to 0.991 (LH05/0781 and LH05/0841) with an average of 0,796, meaning that the genetic distance among ranged from 0.009 to 0.440 with an average of 0.231. The Shannon index and mean heterozygosity values were 0.328 and 0,176, respectively. This indicated that the progenies of the two investigated crosses possessed a relatively high range of genetic variability. The analysis of molecular variance (AMOVA) showed that genetic variation within population represented 62%, while genetic variation among two different crosses contributes 38% to the total genetic variability. Dendrogram based on DICE’s genetic similarity using UPGMA method showed that the hybrids divide into two major genetic groups (0.75), but the crosses were scattered independently of the hybrid.

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