AZ‐GERM SALT‐I Nondormant Alfalfa Germplasm

Dobrenz, A. K.; Schonhorst, M. H.; Stone, J. J.; Thompson, R. K.; Allen, S. E.; Smith, Damon L.

doi:10.2135/cropsci1983.0011183x002300040071x

Cited by 17 publications

(6 citation statements)

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“…The range in response of alfalfa germplasm accessions when germinated in NaCI solutions indicates that, as previously demonstrated by Dobrenz et al (1983Dobrenz et al ( , 1989, it should be possible to select for increased resistance or sensitivity. Resistant M. sativa subsp, sativa germplasm from arid centers of diversity is readily available and may facilitate the development of resistant cultivars adapted to irrigated alfalfa production in the warm desert regions of the United States.…”

Section: Resultssupporting

confidence: 60%

“…Accessions which were unusually sensitive to salinity could be used in physiological experimentation to determine the basis for hypersensitive responses (Noble et al, 1984) or to study genotype-specific regulation of gene expression by environmental stress (Ramagopal, 1987). It should also be noted that different genetic mechanisms are involved in salt resistance during germination than in salt resistance during seedling emergence and development (Dobrenz et al, 1983;Assadian and Miyamoto, 1987). Thus, the germination responses reported here for individual accessions may not indicate their responses at later stages of development.…”

Section: Resultsmentioning

confidence: 95%

“…Ashraf et al (1987) employed different techniques and computed a realized heritability of 31% for the NaC1 resistance of seedling 'Euver' alfalfa. Alfalfa germplasm resistant to salinity during germination and adapted to the warm desert region of the United States has been released (Dobrenz et al, 1983;1989).…”

Section: Introductionmentioning

confidence: 99%

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Germination salt resistance of alfalfa (Medicago sativa L.) germplasm in relation to subspecies and centers of diversity

Rumbaugh

Pendery

1990

Plant Soil

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Saline soils and water severely limit the productivity of crop and pasture lands in semiarid and arid environments. The breeding of salt resistant cultivars of some crops is a partial solution to this problem. To breed for increased salt resistance, scientists must characterize the potentials and limitations of germplasm resources. This study measured the salt resistance of 761 alfalfa (Medicago sativa L. Emend. Sensu Lato) plant introduction accessions to NaC1 during germination and characterized the resistance by subspecies, country of origin, and center of diversity. Experiments indicated that germplasm from the arid Indian and African centers excelled in NaC1 resistance during germination. Germplasm from the Falcata center was least resistant. M. sativa L. subsp, sativa was more than twice as resistant as M. sativa L. subsp, ambigua or subsp, falcata. Thus, more resistant germplasm potentially adapted to the warm desert regions is available than resistant germplasm better suited to alfalfa production in more temperate regions.

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Section: Resultssupporting

confidence: 60%

Section: Resultsmentioning

confidence: 95%

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Germination salt resistance of alfalfa (Medicago sativa L.) germplasm in relation to subspecies and centers of diversity

Rumbaugh

Pendery

1990

Plant Soil

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“…Two plants (CUF-6 and CUF-A) were randomly selected from 'CUF 101' (Lehman et al, 1983), while one plant was selected from 'AZ-GERM SALT-I' (ST-N) (Dobrenz et al, 1983), 'Rangelander' (RI-5) (Heinrichs et al 1980), and 'KYSyn-Y-l' (K II-4) (Taylor, 1980). CUF 101 and AZ-GERM SALT-I are high yielding nonwinterdormant cultivars, while Rangelander and KYSyn-Y-1 are winterdormant cultivars with lower yield potential.…”

Section: Original-regenerant Plant Pairsmentioning

confidence: 99%

Response to NaCl of alfalfa plants regenerated from non-saline callus cultures

Johnson

Smith

1992

Plant Soil

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Salinity restricts crop productivity in many arid environments. Inadvertent selection for tolerance to osmotic stress may occur under cell or tissue culture conditions and could affect the performance of regenerated plants. The effect of NaCI on forage produced by alfalfa (Medicago sativa L.) plants regenerated from non-saline callus cultures was examined in this study. Plants of Regen-S, which was selected for improved callus growth and regeneration in non-saline cultures, had higher forage weight when grown on SHII medium at NaC1 levels up to 100 mM compared to its parental cultivars, Saranac and DuPuits. Five additional original-regenerant plant pairs, each derived from non-saline callus cultures of different alfalfa plants, were evaluated in a solid (soil-like) substrate under saline and non-saline conditions. Weight of forage produced by rooted stem cuttings of regenerated plants was 33% higher at 50 mM NaCI compared to cuttings of explant donor plants. Self progenies from four of five regenerants had higher relative forage weight at 100 mM NaCI (percent of 0 NaCI treatment) than the original plants indicating increased NaC1 tolerance.

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“…M ANY researchers have evaluated the effect of salt stress on germination and growth of alfalfa (Medicago sativa L.) (1, 2,3,4,6,7,8,9,10,11,13,14,16,17,18,19,20,21 ). Techniques used by individual scientists vary considerably, especially in the concentration of salts and number of salinity levels at which cultivars and experimental populations are evaluated.…”

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confidence: 99%

Evaluating the Genetic for Germination Salt Tolerance in Alfalfa Using a Sodium‐Chloride Gradient¹

Robinson¹,

Dobrenz²,

Smith

1986

Agronomy Journal

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Progress made in breeding for salt tolerance at germination may be difficult to evaluate when only limited numbers of salinity levels are used for germplasm comparison. Patterns of response to salt stress may be better distinguished when seed is germinated at numerous osmotic potentials. A gradient of osmotic potentials can be easily created by making a series of small dilutions of a concentrated salt solution. Using this technique, alfalfa (Medicago sativa L.) sej!d from the cultivar Mesa-Sirsa and a Cycle 7 syn-1 experimental developed from Mesa-Sirsa were planted in 37 concentrations of NaCI ranging from 0 to -2.87 MPa. Germination responses across the gradient were sigmoid shaped for both germplasm sources. Natural logarithmic transformations of the data revealed relatively similar and constant germination rates for the two populations at osmotic potentials between 0 and -0.75 MPa. Below these osmotic potentials, percent germination declined abruptly in Mesa-Sirsa while in Cycle 7 syn-1, a stable germination rate was maintained until the salt level reached -1.76 MPa, a threshold concentration more than 2.3 times that of Mesa-Sirsa. At salinities greater than these threshold values, the two populations exhibited similar rates of decline in seed germination. Cycle 7 syn-1 seed germinated more than twice as fast as Mesa-Sirsa at -1.90 MPa. Selection for salt tolerance has both extended the germination range of alfalfa by I MPa and decreased the time required for seed to reach peak germination speed by 5 days. An osmotic gradient provides an excellent method for evaluating germplasm performance in a salt tolerance breeding program.

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AZ‐GERM SALT‐I Nondormant Alfalfa Germplasm

Cited by 17 publications

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Germination salt resistance of alfalfa (Medicago sativa L.) germplasm in relation to subspecies and centers of diversity

Germination salt resistance of alfalfa (Medicago sativa L.) germplasm in relation to subspecies and centers of diversity

Response to NaCl of alfalfa plants regenerated from non-saline callus cultures

Evaluating the Genetic for Germination Salt Tolerance in Alfalfa Using a Sodium‐Chloride Gradient¹

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AZ‐GERM SALT‐I Nondormant Alfalfa Germplasm

Cited by 17 publications

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Germination salt resistance of alfalfa (Medicago sativa L.) germplasm in relation to subspecies and centers of diversity

Germination salt resistance of alfalfa (Medicago sativa L.) germplasm in relation to subspecies and centers of diversity

Response to NaCl of alfalfa plants regenerated from non-saline callus cultures

Evaluating the Genetic for Germination Salt Tolerance in Alfalfa Using a Sodium‐Chloride Gradient1

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Evaluating the Genetic for Germination Salt Tolerance in Alfalfa Using a Sodium‐Chloride Gradient¹