Inducing Germination in Oryzopsis Hymenoides for Range Reseeding<sup>1</sup>

Stoddart, L. A.; Wilkinson, K. J.

doi:10.2134/agronj1938.00021962003000090008x

Cited by 14 publications

(13 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It thrives best on foothills and plains, especially in well-aerated rocky or sanely soils. An excellent forage crop (Rogier, 1960) resistant to heavy grazing (Stoddart and Wilkinson, 1938), it is also capable of controlling wind erosion (Bohmont and Lang, 1957). Furthermore, because of the high protein and fat content present in the seeds, Indian ricegrass seeds are popdar feed of livestock and rodents (Hafenrichter et al, 1968).…”

mentioning

confidence: 99%

Factors Determining Germination of Indian Ricegrass Seeds¹

McDonald¹,

Khan

1977

Agronomy Journal

View full text Add to dashboard Cite

Indian ricegrass, Oryzopsis hymenoides (Roem. & Shult.) Ricker is an important forage crop in the western United States. The seeds of this species are dormant at harvest and even following several years of storage. In spite of several attempts by various workers to uncover the factors responsible for dormancy, little progress has been made to date. The present investigation was undertaken to reexamine in detail the nature of dormancy in these seeds with emphasis on the effects and possible roles of hormones in release of dormancy. The seed coats of Indian ricegrass seeds prevented germination and were shown to delay the uptake of water, gibberellic acid, and tetrazolium salts by the seed. The acid scarification proved the only effective method of breaking dormancy imposed by the seed coats. One‐year‐old scarified Indian ricegrass seeds were also shown to exhibit a post‐harvest dormancy which was overcome by 10 μM gibberellic acid and 10 μM kinetin. Intact seeds contained abscisic acid and the level of this inhibitor decreased following scarification. Gibberellic acid was incorporated into scarified Indian ricegrass seeds by acetone permeation suggesting a commercial preparation for these seeds.

show abstract

mentioning

confidence: 99%

Factors Determining Germination of Indian Ricegrass Seeds¹

McDonald¹,

Khan

1977

Agronomy Journal

View full text Add to dashboard Cite

show abstract

“…The heavy seeds were separated from the light seeds by the density method described by Toole (1940). The fully-developed Indian ricegrass seed was heavier (denser) than undeveloped seed (Stoddart and Wilkinson 1938). Therefore, seeds that did not sink in water after 5 min were removed and discarded.…”

Section: Seed Gennination and Viability Studiesmentioning

confidence: 99%

“…High dormancy of Indian ricegrass seed has caused concern for many years and a number of studies have been conducted to investigate dormancy mechanisms and methods for breaking dormancy to improve seed germination of this species (Stoddart and Wilkinson 1938, Toole 1940, Clark and Bass 1970, McDonald and Khan 1977, Zemetra et al 1983, Zemetra and Cuany 1984, Young and Evans 1984, Young et al 1985, Jones and Nielson 1992. Seed dormancy is a mechanism to optimize the distribution of germination over time, and its importance is best illustrated in an ecological context (Bewley and Black 1982).…”

Section: Introductionmentioning

confidence: 99%

Previous Grazing or Clipping Affects Seed of Indian Ricegrass

Orodho¹,

Cuany²,

Trlica³

1998

Journal of Range Management

View full text Add to dashboard Cite

show abstract

“…The field emergence oflndian ricegrass seeds has been enhanced by mechanical seed scarification in a scarifier where the seeds were rubbed against 80-grit sandpaper (Zemetra et al, 1983). Stoddart and Wilkinson (1938) were probably among the first to enhance germination of Indian ricegrass seeds by removing the lemma and palea with sulfuric acid (H 2 S0 4 ) treatments. Subsequently, this technique has been used sparingly to obtain germination and seedling establishment of this valuable grass [for example, see Plummer and Frischnecht (1952)].…”

mentioning

confidence: 99%

“…First, each population oflndian ricegrass seeds consists of varying proportions of polymorphic seed forms (Huntamer, 1934). Stoddart and Wilkinson (1938) demonstrated that the various polymorphic forms, which they differentiated by seed size, required specific lengths of acid treatment for optimum germination, and that excessive treatment would inhibit all germination. Secondly, acid-scarified Indian ricegrass seeds appear to be susceptible to the soilborne pathogens.…”

mentioning

confidence: 99%

Enhancing Germination of Indian Ricegrass Seeds with Sulfuric Acid¹

Young¹,

Evans²,

Easi³

1985

Agronomy Journal

View full text Add to dashboard Cite

Indian ricegrass [Oryzopsis hymenoides (R. & S.) Ricker] is the dominant forage species on millions of hectares of rangeland in the western United States. Revegetation of degraded rangeland by seeding Indian ricegrass has been generally unsuccessful because of low seed germination. Our purpose was to evaluate the influence of acid seed scarification on germination of Indian ricegrass seeds. Seeds of ‘Paloma’ and ‘NezPar’ Indian ricegrass were scarified in sulfuric acid (H2SO4) from 0 through 45 min at 5‐min intervals. Without scarification, germination of the seeds of these two cultivars was less than 10%. Seedlots from 1 to 11 years old were treated. Germination data were used to develop regression equations for the relationship between duration of acid seed scarification and germination for each cultivar. Seeds of Paloma Indian ricegrass required 25 to 35 min of scarification, whereas seeds of NezPar required 15 to 25 min scarification. The relative composition and morphological forms of the seed may explain the difference in duration of required scarification. The scarified seeds were incubated at 55 constant and alternating temperatures to obtain data with which to construct quadratic response surfaces for temperature‐germination profiles. Even with scarification, the seeds of the two cultivars produced mean germination for the profiles of only 9 to 31%. The dormancy of Indian ricegrass seeds is controlled by complex interacting factors. Acid scarification is a very imprecise tool for enhancing the germination of dormant seeds of Indian ricegrass.

show abstract

Inducing Germination in Oryzopsis Hymenoides for Range Reseeding¹

Cited by 14 publications

References 0 publications

Factors Determining Germination of Indian Ricegrass Seeds¹

Factors Determining Germination of Indian Ricegrass Seeds¹

Previous Grazing or Clipping Affects Seed of Indian Ricegrass

Enhancing Germination of Indian Ricegrass Seeds with Sulfuric Acid¹

Contact Info

Product

Resources

About

Inducing Germination in Oryzopsis Hymenoides for Range Reseeding1

Cited by 14 publications

References 0 publications

Factors Determining Germination of Indian Ricegrass Seeds1

Factors Determining Germination of Indian Ricegrass Seeds1

Previous Grazing or Clipping Affects Seed of Indian Ricegrass

Enhancing Germination of Indian Ricegrass Seeds with Sulfuric Acid1

Contact Info

Product

Resources

About

Inducing Germination in Oryzopsis Hymenoides for Range Reseeding¹

Factors Determining Germination of Indian Ricegrass Seeds¹

Factors Determining Germination of Indian Ricegrass Seeds¹

Enhancing Germination of Indian Ricegrass Seeds with Sulfuric Acid¹