scholarly journals Effects of Salt Stress on Amino Acid, Organic Acid, and Carbohydrate Composition of Roots, Bacteroids, and Cytosol of Alfalfa (Medicago sativa L.)

1991 ◽  
Vol 96 (4) ◽  
pp. 1228-1236 ◽  
Author(s):  
Francoise Fougère ◽  
Daniel Le Rudulier ◽  
John G. Streeter
Keyword(s):  
Salt Stress ◽  
Amino Acid ◽  
Organic Acid ◽  
Medicago Sativa ◽  
Carbohydrate Composition ◽  
Medicago Sativa L

scholarly journals Strategies to Increase Prediction Accuracy in Genomic Selection of Complex Traits in Alfalfa (Medicago sativa L.)

Cells ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 3372
Author(s):  
Cesar A. Medina ◽  
Harpreet Kaur ◽  
Ian Ray ◽  
Long-Xi Yu
Keyword(s):  
Salt Stress ◽  
Abiotic Stress ◽  
Medicago Sativa ◽  
Genomic Selection ◽  
Complex Traits ◽  
Prediction Accuracy ◽  
Breeding Value ◽  
Phenotypic Traits ◽  
Genome Wide ◽  
Medicago Sativa L

Agronomic traits such as biomass yield and abiotic stress tolerance are genetically complex and challenging to improve through conventional breeding approaches. Genomic selection (GS) is an alternative approach in which genome-wide markers are used to determine the genomic estimated breeding value (GEBV) of individuals in a population. In alfalfa (Medicago sativa L.), previous results indicated that low to moderate prediction accuracy values (<70%) were obtained in complex traits, such as yield and abiotic stress resistance. There is a need to increase the prediction value in order to employ GS in breeding programs. In this paper we reviewed different statistic models and their applications in polyploid crops, such as alfalfa and potato. Specifically, we used empirical data affiliated with alfalfa yield under salt stress to investigate approaches that use DNA marker importance values derived from machine learning models, and genome-wide association studies (GWAS) of marker-trait association scores based on different GWASpoly models, in weighted GBLUP analyses. This approach increased prediction accuracies from 50% to more than 80% for alfalfa yield under salt stress. Finally, we expended the weighted GBLUP approach to potato and analyzed 13 phenotypic traits and obtained similar results. This is the first report on alfalfa to use variable importance and GWAS-assisted approaches to increase the prediction accuracy of GS, thus helping to select superior alfalfa lines based on their GEBVs.

Rhizobium symbiosis contribution to short-term salt stress tolerance in alfalfa (Medicago sativa L.)

2016 ◽  
Vol 402 (1-2) ◽  
pp. 247-261 ◽  
Author(s):  
Yafang Wang ◽  
Zhiqiang Zhang ◽  
Pan Zhang ◽  
Yuman Cao ◽  
Tianming Hu ◽  
...  
Keyword(s):  
Salt Stress ◽  
Medicago Sativa ◽  
Stress Tolerance ◽  
Salt Stress Tolerance ◽  
Short Term ◽  
Medicago Sativa L

Changes in Source-Sink Relationship for Nitrogen During Regrowth of Lucerne (Medicago sativa L.) Following Removal of Shoots

1991 ◽  
Vol 18 (6) ◽  
pp. 593 ◽  
Author(s):  
TH Kim ◽  
A Ourry ◽  
J Boucaud ◽  
G Lemaire
Keyword(s):  
Amino Acid ◽  
Medicago Sativa ◽  
Hydroponic Culture ◽  
Intact Plants ◽  
Medicago Sativa L ◽  
Stems And Leaves ◽  
Almost All ◽  
Source Sink ◽  
Induced Changes ◽  
Nitrogen Remobilisation

An experiment with lucerne plants (Medicago sativa L.) previously labelled with 15N and grown in hydroponic culture, was undertaken to define sink and source behaviour of different organs in defoliated and intact plants. Changes in 15N contents of plants during 24 days of regrowth on an unlabelled medium after defoliation were used to estimate flows of exogenous and endogenous nitrogen. The 15N content of regrowing stems and leaves increased as a result of remobilisation mainly from lateral and tap roots which, therefore, acted as source organs. Nitrogen remobilisation reached a plateau after 10 days of regrowth and, until this time, nearly all N for shoot regrowth came from endogenous N in roots and crown. Between 25 and 35% of N reserves were translocated to regrowing stems, the remainder to regrowing leaves. Amino acid-N was the most readily available form of N while protein-N was the largest storage pool. Nitrogen uptake from the medium and accumulation in source organs (roots and crown) was significant only between days 6 and 14, and almost all was subsequently translocated to regrowing tissues. Defoliation induced changes in source-sink relationships for N. Whereas stems and tap roots were the main sink organs in intact plants, regrowing shoots exerted a stronger sink behaviour in defoliated plants.

scholarly journals Melatonin Application Improves Salt Tolerance of Alfalfa (Medicago sativa L.) by Enhancing Antioxidant Capacity

Plants ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 220 ◽  
Author(s):  
Huifang Cen ◽  
Tingting Wang ◽  
Huayue Liu ◽  
Danyang Tian ◽  
Yunwei Zhang
Keyword(s):  
Antioxidant Enzymes ◽  
Salt Stress ◽  
Salt Tolerance ◽  
Medicago Sativa ◽  
Salt Resistance ◽  
Primary Role ◽  
Waterlogging Tolerance ◽  
Alfalfa Seed ◽  
Mda Content ◽  
Medicago Sativa L

Alfalfa (Medicago sativa L.) is an important and widely cultivated forage grass. The productivity and forage quality of alfalfa are severely affected by salt stress. Melatonin is a bioactive molecule with versatile physiological functions and plays important roles in response to various biotic and abiotic stresses. Melatonin has been proven efficient in improving alfalfa drought and waterlogging tolerance in recent studies. In our reports, we applied melatonin exogenously to explore the effects of melatonin on alfalfa growth and salt resistance. The results demonstrated that melatonin application promoted alfalfa seed germination and seedling growth, and reduced oxidative damage under salt stress. Further application research found that melatonin alleviated salt injury in alfalfa plants under salt stress. The electrolyte leakage, malondialdehyde (MDA) content and H2O2 content were significantly reduced, and the activities of catalase (CAT), peroxidase (POD), and Cu/Zn superoxide dismutase (Cu/Zn-SOD) were increased with melatonin pretreatment compared to control plants under salt stress with the upregulation of genes related to melatonin and antioxidant enzymes biosynthesis. Melatonin was also involved in reducing Na+ accumulation in alfalfa plants. Our study indicates that melatonin plays a primary role as an antioxidant in scavenging H2O2 and enhancing activities of antioxidant enzymes to improve the salt tolerance of alfalfa plants.

scholarly journals Effects of salt stress on lipid peroxidation and antioxidative enzymes of alfalfa (Medicago sativa L.) cultivars

2015 ◽  
Vol 43 (2) ◽  
pp. 191-196
Author(s):  
Ensieh Ashrafi ◽  
Morteza Zahedi ◽  
Jamshid Razmjoo
Keyword(s):  
Lipid Peroxidation ◽  
Salt Stress ◽  
Salt Tolerance ◽  
Medicago Sativa ◽  
Antioxidative Enzymes ◽  
Enzyme Activities ◽  
Seedling Stage ◽  
Salt Tolerant ◽  
Mda Content ◽  
Medicago Sativa L

The effect of salt stress on enzyme activities of nine alfalfa cultivars at germination and seedling stage was studied. The activities of SOD, GR, POX and APOX were higher in salt tolerant and lower in salt sensitive cultivars. Results of the effect of salt stress on the SOD, GR, POX, APOX activities and MDA content may be used to select salt tolerance cultivars at the germination and seedling stages. SOD, GR, POX, APOX and MDA may play an important role in salt tolerant mechanisms in alfalfa. DOI: http://dx.doi.org/10.3329/bjb.v43i2.21672 Bangladesh J. Bot. 43(2): 191-196, 2014 (September)

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