Effects of temperature and photoperiod on frost resistance of white clover <i>(Trifolium repens)</i> ecotypes

Junttila, Olavi; Svenning, Mette M.; Solheim, Bjørn

doi:10.1111/j.1399-3054.1990.tb02099.x

Cited by 39 publications

(13 citation statements)

References 10 publications

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“…However, all the genotypes studied were able to develop cold tolerance under the northern climatic conditions, and the time course of hardening was rather similar, too. This is in accordance with our phytotron studies, which did not reveal significant interactions between hardening treatments and various genotypes of white clover (Junttila et al, 1990b). The main increase in hardiness occurred between September 26 and November 8 (Table 3).…”

Section: Discussionsupporting

confidence: 93%

“…(Junttila et al, 1990b). However, all the genotypes studied were able to develop cold tolerance under the northern climatic conditions, and the time course of hardening was rather similar, too.…”

Section: Discussionmentioning

confidence: 88%

“…The main increase in hardiness occurred between September 26 and November 8 (Table 3). Under the northern, subarctic conditions this can be considered to be a relatively late hardening, and it could be due to the requirement for short day conditions for proper hardening (Junttila et al, 1990b;R~snes, unpublished results). The present study did not include investigation of overwintering ability of the various genotypes, but the artificial freezing test used is supposed to give a good comparison of hardiness between various genotypes.…”

Section: Discussionmentioning

confidence: 96%

“…Samples consisted of 3-5 cm long apical pieces of stolons, and they were frozen in moist sand at a rate of 3 4°C h-I to predetermined temperatures between -4 and -18°C (Junttila et al, 1990b). After thawing at 5°C overnight, samples were incubated between moist filter papers at 18°C for five days before they were evaluated for survival.…”

Section: Freezing Testmentioning

confidence: 99%

“…White clover is, however, native in these areas (Benum, 1958), indicating that it has the capacity for survival under the northern climatic conditions. Vegetative growth and cold hardiness of indigenous white clover have been studies under controlled conditions (Junttila et al, 1990a;1990b). Those studies revealed significant differences in cold hardiness between various genotypes and populations, and they showed that low-temperature induced hardening is enhanced by a short day treatment (Junttila et a]., 1990b).…”

Section: Introductionmentioning

confidence: 96%

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Development of Cold Tolerance in White Clover (Trifolium repensL.) in Relation to Carbohydrate and Free Amino Acid Content

Rosnes

Junttila

Ernstsen

et al. 1993

Acta Agriculturae Scandinavica, Section B - Soil & Plant Sc

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Development of cold tolerance in white clover (fi;Jo~ium repens L.) in relation to carbohydrate and free amino acid concent. Accepted February 5, 1993. Acta Agric. Scand., Sect. B, Soil and Plant Sci. 43: 151-155, 1993. 0 Acta Agric. Scand. 1993.Development of cold tolerance in white clover (fiifoliioir repelis L.) genotypes originating from various parts of Norway and grown outdoors at Tromsu, latitude 69" 39'N, has been studied. Stolon samples for an artificial freezing test and for chemical analysis were collected three times during the autumn. Generally, the most northern genotypes were more cold tolerant than the southern ones. Cold tolerance increased significantly from September to November in all genotypes. Content of dry matter, soluble carbohydrates, sucrose and proline in stolons increased during the hardening process. These changes were similar in both northern and southern genotypes of white clover.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 96%

Section: Freezing Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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Development of Cold Tolerance in White Clover (Trifolium repensL.) in Relation to Carbohydrate and Free Amino Acid Content

Rosnes

Junttila

Ernstsen

et al. 1993

Acta Agriculturae Scandinavica, Section B - Soil & Plant Sc

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Microclimate predicts frost hardiness of alpineArabidopsis thalianapopulations better than elevation

Lampei

Wunder

Wilhalm

et al. 2019

Ecology and Evolution

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In mountain regions, topological differences on the microscale can strongly affect microclimate and may counteract the average effects of elevation, such as decreasing temperatures. While these interactions are well understood, their effect on plant adaptation is understudied.We investigated winter frost hardiness of Arabidopsis thaliana accessions originating from 13 sites along altitudinal gradients in the Southern Alps during three winters on an experimental field station on the Swabian Jura and compared levels of frost damage with the observed number of frost days and the lowest temperature in eight collection sites.We found that frost hardiness increased with elevation in a log‐linear fashion. This is consistent with adaptation to a higher frequency of frost conditions, but also indicates a decreasing rate of change in frost hardiness with increasing elevation. Moreover, the number of frost days measured with temperature loggers at the collection sites correlated much better with frost hardiness than the elevation of collection sites, suggesting that populations were adapted to their local microclimate. Notably, the variance in frost days across sites increased exponentially with elevation. Together, our results suggest that strong microclimate heterogeneity of high alpine environments can preserve functional genetic diversity among small populations.Synthesis: Here, we tested how plant populations differed in their adaptation to frost exposure along an elevation gradient and whether microsite temperatures improve the prediction of frost hardiness. We found that local temperatures, particularly the number of frost days, are a better predictor of the frost hardiness of plants than elevation. This reflects a substantial variance in frost frequency between sites at similar high elevations. We conclude that high mountain regions harbor microsites that differ in their local microclimate and thereby can preserve a high functional genetic diversity among them. Therefore, high mountain regions have the potential to function as a refugium in times of global change.

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Changes in Stolon Carbohydrates During the Winter in Four Varieties of White Clover (Trifolium repensL.) with Contrasting Hardiness

Turner

Pollock

1998

Annals of Botany

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Effects of temperature and photoperiod on frost resistance of white clover (Trifolium repens) ecotypes

Cited by 39 publications

References 10 publications

Development of Cold Tolerance in White Clover (Trifolium repensL.) in Relation to Carbohydrate and Free Amino Acid Content

Development of Cold Tolerance in White Clover (Trifolium repensL.) in Relation to Carbohydrate and Free Amino Acid Content

Microclimate predicts frost hardiness of alpineArabidopsis thalianapopulations better than elevation

Changes in Stolon Carbohydrates During the Winter in Four Varieties of White Clover (Trifolium repensL.) with Contrasting Hardiness

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