The relationship between fall dormancy and germplasm source in North American alfalfa cultivars

Fairey, D. T.; Fairey, N. A.; Lefkovitch, L. P.

doi:10.4141/cjps96-076

Cited by 17 publications

(10 citation statements)

References 4 publications

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“…The inconsistencies among the incremental differences between consecutive FDR categories, for both seed and total biomass yield, are possibly an indication of imprecision inherent in the FDR system. Such imprecision was evident in a field study of 251 alfalfa varieties in Minnesota, USA (Schwab et al, 1996) and in an analysis of 480 North American alfalfa varieties that was unable to confirm the existence of nine distinct groups of fall dormancy (Fairey et al, 1996). Furthermore, recent studies have confirmed that it is possible to select for fall dormancy independently from winter hardiness within alfalfa (Brouwer et al, 2000;Brummer et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

Effects of fall dormancy of alfalfa on seed production at a northern latitude

Fairey

Lefkovitch³

et al. 2003

Plant Genet. Res.

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The agri-climatic adaptation of an alfalfa variety in North America is categorized by its Fall Dormancy Rating (FDR1 = dormant to FDR9 = non-dormant). Presently, only relatively dormant, winter-hardy varieties (FDR1-4) are grown for seed and herbage at the northern latitudes of western Canada. However, there is considerably greater demand for seed of varieties that have FDR $ 4: A study was conducted in the Peace River region of north-western Canada to determine the relationship between FDR and seed production of alfalfa with FDR $ 4: Trials were established in each of two consecutive years with four varieties representing each of six FDR categories, FDR4-9. Growth characteristics were determined for two successive years of seed crops for each year of establishment. Seed yield (as a percentage of that for FDR4) was 84, 52, 40, 29 and 39% for FDR5 to FDR9, respectively, whereas total biomass at seed maturity was 89, 73, 73, 57 and 57% for FDR5 to FDR9, respectively. Seed yield was more sensitive to changes in FDR than total biomass. Short rotations of specific alfalfa varieties with FDR $ 4 could be an option for seed growers in the northerly latitudes of western Canada, provided greater financial compensation is given for higher FDR varieties, and provided genetic drift can be retained within acceptable limits.

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Section: Discussionmentioning

confidence: 99%

Effects of fall dormancy of alfalfa on seed production at a northern latitude

Fairey

Lefkovitch³

et al. 2003

Plant Genet. Res.

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“…Contrary to the common belief that dormant alfalfa is low yielder, annual average yield of some dormant cultivars showed higher biomass than non-dormant cultivars in their environment of adaptation [http://oregonstate.edu/]. Fairey et al (1996) described the relationship between North American alfalfa cultivars in terms of their source of germplasm and FD performances [47], which led to the development of 11 FD classes as check cultivars [48]. A significant interaction between location and variety has been found among the 19 tested varieties with 7 FD classes (2 to 8) over five locations in China [49].…”

Section: Fall Dormancy and Winter Hardinessmentioning

confidence: 99%

Insights into Seasonal Dormancy of Perennial Herbaceous Forages

Adhikari¹,

Razar²,

Paudel³

et al. 2017

AJPS

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Seasonal dormancy is an adaptive mechanism where plants suspend growth and become physiologically inactive to avoid extreme environmental conditions. Environmental factors like temperature, photoperiod, nutrients, and soil moisture control plant growth and development through various complex molecular mechanisms. Crown and seed dormancy of plants are mostly influenced by day length and temperature. Genes and physiological pathways triggered by these two factors along with genotype variability are some targets to manipulate seasonal dormancy. There is genetic variation in the depth and duration of seasonal dormancy. Therefore, their genetic manipulation is possible. Manipulations of summer and fall dormancy are relatively easier compared to winter dormancy because plants require protection of their apical meristem from freezing temperatures and limited water supply. Genetic factors that regulate seed dormancy may also have regulatory role for seasonal dormancy of the maternal plants. Limited genetic and genomic information are available for seasonal dormancy in herbaceous perennial species. Knowledge of genes controlling seasonal dormancy of eudicots, forest trees, and horticultural crops could be interpolated to explore possible dormancy mechanisms in perennial forages. This study reviews current knowledge of seasonal dormancy of herbaceous forages emphasizing the genetic and physiological context that would be valuable to breeders and plant biologists to expand the production season of perennial species by developing non-dormant and semi-dormant cultivars.

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“…When selecting alfalfa varieties, researchers and producers in China need to consider several criteria such as yield potential, disease and insect resistance, fall dormancy (FD) and winter hardiness. Fall dormancy refers to the adaptation of alfalfa to particular environments, including shortening photoperiods and declining temperatures in late summer and autumn (Schwab et al, 1996;Fairey et al, 1996;Wang et al, 2008). FD is usually divided into three types: dormant (FD 1 -3 classes), semi or intermediate dormant , and non-dormant (FD 7 -9 classes) (Barnes et al, 1979).…”

Section: Introductionmentioning

confidence: 99%

Performance of alfalfa varieties with different fall dormancy across different production areas of Henan Province of China

Xu¹,

Bing²,

zhang³

et al. 2012

Afr. J. Agric. Res.

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Nineteen alfalfa varieties of seven different fall dormancy (FD) classes (2 to 8) over three years in five different eco-agricultural areas with mild climates in Henan Province of China was studied. The results showed that almost all of the varieties exhibited nearly perfect survival rates, while the variety 'Siriver' had a slightly lower survival rate of 98.5%. The variety 'WL414' (FD 6) produced the greatest average dry matter (DM) yield across the regions, while the lowest yield was found in 'Golden Empress' (FD 2). In addition, the total dry matter (DM) yields of the three years were affected by location and variety and there was significant location × variety interaction. The FD classes and total DM yields were significantly correlated, indicating that FD class should be used as one of the main criterion for alfalfa variety improvement or introduction of new varieties into a temperate region, such as Central China. Beside, special attention should also be paid to the selection of varieties suitable to local conditions because other factors have important influence on DM yields, including the characteristics of a varieties and environmental conditions.

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The relationship between fall dormancy and germplasm source in North American alfalfa cultivars

Cited by 17 publications

References 4 publications

Effects of fall dormancy of alfalfa on seed production at a northern latitude

Effects of fall dormancy of alfalfa on seed production at a northern latitude

Insights into Seasonal Dormancy of Perennial Herbaceous Forages

Performance of alfalfa varieties with different fall dormancy across different production areas of Henan Province of China

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