Assessing eight grass species for pasture by measuring etiolated spring regrowth

Lardner, H.A.; Wright, S. B. M.; Cohen, R. D. H.

doi:10.4141/p02-053

Cited by 17 publications

(7 citation statements)

References 16 publications

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“…In a previous study, etiolated growth in early spring was greater in meadow bromegrass than smooth bromegrass (Lardner et al 2003). In a previous study, etiolated growth in early spring was greater in meadow bromegrass than smooth bromegrass (Lardner et al 2003).…”

Section: Introductionmentioning

confidence: 66%

“…Etiolated growth immediately after defoliation may indicate how rapidly the plant can use the stored reserves to produce leaf tissue. In a previous study, etiolated growth in early spring was greater in meadow bromegrass than smooth bromegrass (Lardner et al 2003). However, seasonal carbohydrate cycles are related to developmental stages of growth.…”

Section: Introductionmentioning

confidence: 66%

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Etiolated regrowth of three bromegrass (Bromus) species after defoliation at different developmental stages

Biligetu

Coulman

2011

Grassland Science

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Smooth bromegrass (Bromus inermis Leyss.), meadow bromegrass (Bromus riparius Rehm.) and hybrid bromegrass (B. riparius × B. inermis) are widely used for hay and pasture in temperate regions of the world. Three bromegrass species have variable capacities to regrow following defoliation and remobilization of stored energy after defoliation may vary among these grasses. A field study was conducted in 2006 and 2007 in Saskatoon (52°07′N, 106°38′W), Canada to determine etiolated regrowth of three bromegrass species after defoliation to a 2.5‐cm stubble height at the vegetative, stem elongation, reproductive stages of development, and after plant dormancy in late fall. After 5 and 10 days following defoliation, etiolated regrowth of meadow and hybrid bromegrass was greater than smooth bromegrass at the vegetative stage, and was greatest in meadow bromegrass, intermediate in hybrid bromegrass, and least in smooth bromegrass at the stem elongation stage. By 30 days and thereafter, etiolated regrowth was similar among three bromegrass species when defoliated at any growth stage. Etiolated regrowth was similar among the three species when defoliated at the reproductive stage. Meadow and hybrid bromegrasses produced more etiolated regrowth than smooth bromegrass on dormant plants in a growth chamber. The percentage of total etiolated regrowth to total full light regrowth increased with advanced growth stage in all three bromegrasses, and this percentage was higher in smooth bromegrass than the other two bromegrasses at the stem elongation and reproductive stages. The results of this study suggest that, following defoliation, meadow and hybrid bromegrass can mobilize stored energy more rapidly for regrowth than smooth bromegrass in the early regrowth period, contrary to the greater dependence on stored reserves in smooth bromegrass at the later growth stages.

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Section: Introductionmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 66%

Etiolated regrowth of three bromegrass (Bromus) species after defoliation at different developmental stages

Biligetu

Coulman

2011

Grassland Science

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“…The hybrid bromegrass cultivar "Knowles" was recently developed by hybridizing smooth and meadow bromegrass and has potential for both hay and pasture use [3]. A number of studies have been conducted in the field to understand morphological and physiological characteristics of the three bromegrass species in response to defoliation [1,[4][5][6][7]; however, little information is available on how these three species respond to defoliation under different growth environments.…”

Section: Introductionmentioning

confidence: 99%

Responses of Three Bromegrass (Bromus) Species to Defoliation under Different Growth Conditions

Biligetu¹,

Coulman

2010

International Journal of Agronomy

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Bromegrass species are important forage crops in temperate regions of world. This study compared responses of three bromegrass species to defoliation in the greenhouse and field to determine if the former could predict responses in the latter. Experiments were conducted in 2006 and 2007 in Saskatoon (52°07′N,106°38′W), Canada on meadow bromegrass (Bromus ripariusRehm.), smooth bromegrass (Bromus inermisLeyss.), and hybrid bromegrass (B. ripariusX B.inermis) following defoliation to 5 cm stubble height. When defoliated at the vegetative stage, above-ground biomass was similar among the three species in the field, but meadow bromegrass produced greater above-ground biomass than smooth bromegrass in the greenhouse. When defoliated at the stem elongation stage, meadow bromegrass produced greater above-ground biomass than smooth bromegrass in both environments. In the field, for all defoliation treatments, tiller number was greatest in meadow bromegrass, intermediate in hybrid bromegrass, and least in smooth bromegrass. In the greenhouse, however, the three species did not differ in tiller number. Similar results were found for below-ground biomass. Thus, testing the effect of defoliation in the greenhouse environment did not accurately predict the effect in the field environment.

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“…Moreover, plants with an excellent spring regrowth vigor trait can reduce the pressure of weeds in the spring, which is conducive to growth and has an important impact on the yield and quality of the first cut of alfalfa. Perennial forage yields are believed to be strongly influenced by the amount of organic reserves developed during the last growing season [6]. These reserves are predominantly nonstructural carbohydrates, including quantities of nitrogenous compounds and accumulate in the roots and crowns of plants [7].…”

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confidence: 99%

Detection of Quantitative Trait Loci (QTL) associated with the spring regrowth vigor trait in alfalfa (Medicago sativa L.)

Jiang

Zhang

Zhen

et al. 2020

Preprint

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Background: Alfalfa ( Medicago sativa L.) is a perennial forage legume with a reputation as being the "queen of forage". Spring regrowth vigor refers to the process of perennial alfalfa returning to growth after winter survival. The objective of this research was to identify candidate genes significantly associated with spring regrowth vigor.Results: We used a tetraploid alfalfa F1 population comprised of 392 progenies to identify quantitative trait loci (QTL) that control this trait. The F1 population phenotypic data were collected using a total of three environmental phenotypic data. The mapping population was genotyped using Genotyping-bysequencing (GBS), and linkage maps were developed based on single nucleotide polymorphism (SNP) markers. Fifteen significant QTL for spring regrowth vigor were detected in both parents. Five QTL were identified in the male genetic map, while ten QTL were identified in the female. Four QTL were located on homolog 7D of the male parent, and two QTL were colocalized. Five QTL were mapped on homolog 6D of the female parent, and two QTL were colocalized.Conclusions: The QTL presented in this study can be used to improve the efficiency of alfalfa breeding programs and provide valuable resources for the genetic improvement of alfalfa using markerassisted selection (MAS). β These authors contributed equally to this research. Background Alfalfa (Medicago sativa L.) is a high-value autotetraploid (2n = 4 × = 32) legume forage crop with a genome size of approximately 1000 Mb [1, 2], and has a very wide range of uses, such as in hay, silage and pasture [3]. Alfalfa plants are highly heterozygous and exhibit severe inbreeding depression, precluding the development of inbred lines [4]. Alfalfa breeding programs have focused on forage yield, quality, fall dormancy and resistance to biotic and abiotic stressors. Conventional breeding programs are usually based on simple phenotypic selection, which requires a long breeding

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Assessing eight grass species for pasture by measuring etiolated spring regrowth

Cited by 17 publications

References 16 publications

Etiolated regrowth of three bromegrass (Bromus) species after defoliation at different developmental stages

Etiolated regrowth of three bromegrass (Bromus) species after defoliation at different developmental stages

Responses of Three Bromegrass (Bromus) Species to Defoliation under Different Growth Conditions

Detection of Quantitative Trait Loci (QTL) associated with the spring regrowth vigor trait in alfalfa (Medicago sativa L.)

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