Phasic development in field crops I. Thermal response in the seedling phase

Angus, J. F.; Cunningham, RB; Moncur, M. W.; Mackenzie, D. H.

doi:10.1016/0378-4290(80)90042-8

Cited by 229 publications

(142 citation statements)

References 11 publications

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“…The linear relationships of sub-optimal temperatures enabled a clear base temperature to be defined, below which no germination occurs. In all cases, except B. erectus (5.8°c), these values were less than 2.5°c and consistent with those expected for temperate species (angus et al 1981;Moot et al 2000;Trudgill et al 2005). Similarly, there was a decline in the rate and maximum germination percentage obtained above the optimum (Fig.…”

Section: Germinationsupporting

confidence: 86%

Thermal time requirements for germination, emergence and seedling development of adventive legume and grass species

Lonati¹,

Moot

Aceto

et al. 2009

New Zealand Journal of Agricultural Research

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Thermal time (Tt, °C days) was used to quantify germination, emergence and leaf appearance of temperate grassland species from natural and commercial seed populations. Germination requirements of six clovers (Trifolium arvensis, T. dubium, T. glomeratum, T. striatum, T. subterraneum, T. repens) were determined from constant temperatures from 5 to 35°C. The base temperatures (T b ) were all less than 2.5°C, except for B. erectus (5.8°C). The four grasses had slower rates of germination and a wider tolerance of high temperatures than the clovers. All five annual clovers had a lower thermal time requirement for emergence and seedling development than the perennial T. repens. For four of the species used, the internationally recommended seed testing procedures that requires prechilling was found to be unnecessary and for two others the currently recommended optimum temperatures are higher than the optimum found. The thermal time approach has provided a robust summary of large datasets generated from controlled and field conditions. These easily transferable coefficients can be used to quantify seed and seedling responses to temperature for individual species and should form the basis for redefining seed testing regimes.

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Section: Germinationsupporting

confidence: 86%

Thermal time requirements for germination, emergence and seedling development of adventive legume and grass species

Lonati¹,

Moot

Aceto

et al. 2009

New Zealand Journal of Agricultural Research

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“…Maria da Fé (6,9 ºC), os valores foram próximos aos encontrados por Chiang e Brown (2007) para diferentes espécies perenes como Quercus velutina (carvalho negro) e Acer saccharum (5°C), Acer rubrum (acer vermelho) e Betula popifolia (Bétula cinzenta) (7,5ºC); por Lucas et al (2012) para melancia (7,0°C); por Müller et.al. (2009) para azevém (7,0 à 8,0°C); por Angus et al (1981) para cártamo (7,4°C); e por para Eucalyptus saligna (8ºC).…”

Section: Resultsunclassified

Estimativa da temperatura basal inferior para as cultivares de oliveira Grappolo e Maria da Fé

Souza

Martins

2014

Rev. bras. meteorol.

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A temperatura basal inferior (Tb) é uma variável de entrada muito utilizada em modelos que quantificam o desenvolvimento de culturas agrícolas e florestais. O objetivo deste trabalho foi estimar a Tb para o desenvolvimento vegetativo na fase de muda, para duas cultivares de oliveira, Grappolo e Maria da Fé, em condições de campo. O estudo foi desenvolvido na área Experimental da Empresa de Pesquisa Agropecuária de Minas Gerais, em Maria da Fé, MG, Brasil, conduzido sob o delineamento inteiramente casualizado, sendo duas cultivares de oliveira, três épocas de transplantio, e quinze repetições. A Tb foi estimada através de seis métodos, cujos valores obtidos variaram em função do método de cálculo utilizado. A Tb estimada foi de 9,6 ºC para a Grappolo e 6,9 ºC para a Maria da Fé. Palavras-chave: Desenvolvimento, Temperatura do ar, Fenologia, Olea europaea L. ABSTRACT: ESTIMATE OF THE BASE TEMPERATURE IN TWO OLIVE CULTIVARS:GRAPPOLO AND MARIA DA FÉ The base temperature (Tb) is an input variable widely used in models of agricultural and forest crops development. The aim of this study was to estimate the Tb for vegetative development, represented by seedling phase in two olive cultivars under field conditions. The experiment was carried out in the experimental area of the Agricultural Research Corporation of Minas Gerais, in Maria da Fé, Minas Gerais, Brazil. The experimental design was completely randomized with two olive cultivars, three transplanting dates and fifteen repetitions. The Tb was estimated by six methods described in literature, whose values varied depending on each method of calculation. The estimated Tb was 9.6 ºC for Grappolo and 6.9 ºC to Maria da Fé, respectively.

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“…Tropical species usually require warmer growing conditions than temperate species, and this is often reflected in their T b . For example, Angus et al (1981) estimated values of T b of 3mC for the germination of wheat, barley and oats (temperate crops) compared with 10mC for most cultivars of millet and sorgum (tropical crops). Similarly, Trudgill & Perry (1994) showed that T b for one generation of a temperate species of parasitic root-knot nematode (Meloidogyne hapla, T b l 8.25mC) was c. 5mC less than for a closely related, biologically similar tropical species (Meloidogyne javanica, T b l 13mC).…”

Section: mentioning

confidence: 99%

A thermal time basis for comparing the germination requirements of some British herbaceous plants

Squire¹,

Thompson²

2000

New Phytologist

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The effect of temperature on germination rate was assessed for seeds of 31 wild plant species and four cultivated species growing in the UK. The temperature at which seed first germinated ranged from 2mC (Brassica rapa) to 11mC (several species). As the temperature progressively increased, the percentage of seed that germinated rapidly increased to near 100%, whereas the duration for germination progressively decreased up to the thermal optimum. Above the thermal optimum, the duration for germination initially remained constant, and then rapidly increased until the thermal maximum was exceeded when no seed germinated. To assess the effect of temperature on germination rates, the reciprocal of the duration (1\duration) for 50% germination was calculated and regressed against temperature. For most species a linear regression accounted for 90% of the variation in germination rates for temperatures up to the thermal optimum. From the regressions, the base temperatures (T b , below which no germination is expected) and the thermal constant (S, expressed in degree days) for 50% germination were calculated. The extremes were the alpine species Dryas octopetala, which had a high T b (c. 12.0mC) and low S (26 degree days), and Saxifraga tridactylites which had a low estimated T b (c. k1.8mC) and a high S (136 degree days). The estimated value of S increased with increasing percentage germination, and although S varied considerably between species with similar values of T b , a weak inverse relationship between T b and S was indicated. A thermal time approach was shown to be useful when analysing and comparing thermal requirements for germination of the seed of wild plant species. It showed, for example, that percentage germination often decreased as temperatures approached T b , and that for some seed germination ceased at temperatures well above T b .

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Phasic development in field crops I. Thermal response in the seedling phase

Cited by 229 publications

References 11 publications

Thermal time requirements for germination, emergence and seedling development of adventive legume and grass species

Thermal time requirements for germination, emergence and seedling development of adventive legume and grass species

Estimativa da temperatura basal inferior para as cultivares de oliveira Grappolo e Maria da Fé

A thermal time basis for comparing the germination requirements of some British herbaceous plants

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