Optimal Temperature for Germination of Zephyra compacta (Tecophilaeaceae)

Cuadra, Carlos De la; Vidal, Alexis; Mansur, L. M.

doi:10.21273/hortsci11623-16

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…In addition, we can reconfirm the findings of Baskin and Baskin (2014) in that the effective way to determine physical dormancy in seeds is through imbibition testing. A similar characteristic of testa not conferring physical resistance to water entry can also be seen on C. bifolia, Zephyra compacta, Z. elegans and Z. violiflora, all of which are in the Tecophilaeaceae (Schiappacasse et al, 2005;Vidal et al, 2012;De la Cuadra et al, 2017). For each species and scarified treatment, mean values within a column followed by the same lower-case letter do not differ significantly (P ≤ 0.05) according to a test of equality of two means when population variances are not equal.…”

Section: Discussionmentioning

confidence: 57%

Effect of temperature and scarification on seed germination of Conanthera spp. (Tecophilaeaceae)

Cuadra

Vidal

Lagomarsino

et al. 2019

Chil. j. agric. res.

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The Chilean endemic genus Conanthera is comprised of five species of herbaceous cormous geophytes. They have ornamental value due to their bell-shaped flowers, which are blue, violet or white. Previous germination studies of Conanthera campanulata and Conanthera trimaculata were carried out at 22 °C, and manual mechanical scarification improved germination. Based on these results, it was suggested that physical dormancy is present in the non-scarified seeds. However, an improvement in germination after scarification is not enough evidence to conclude that the seed is non-permeable to water and thus has physical dormancy. The objective of the present study was to assess the testa water permeability via an imbibition test and to identify the optimum germination temperature in C. campanulata and C. trimaculata. Using 6-mo-old seeds, data from the imbibition tests showed that neither the seeds of C. campanulata nor C. trimaculata have physical dormancy. In the germination experiments, the temperature range for achieving high germination percentages was 10 to 15 °C, where germination reached 90% in less than 28 d. Temperature of 20 °C can be considered supra-optimal, while 5 and 25 °C inhibited germination. Manual mechanical scarification did not affect germination results at the range of 10 to 15 °C. However, at the supra-optimal temperature of 20 °C manual mechanical scarification increased germination, although levels were never higher than 25%.

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Section: Discussionmentioning

confidence: 57%

Effect of temperature and scarification on seed germination of Conanthera spp. (Tecophilaeaceae)

Cuadra

Vidal

Lagomarsino

et al. 2019

Chil. j. agric. res.

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“…This habitat is mainly composed of sandy soils with a coastal desert climate and abundant cloud cover, which in accordance with the K€ oppen classification system would be classified as BWn (Juli a et al, 2008). As is also the case with Z. compacta (De la Cuadra et al, 2017), the climate in which Z. elegans grows experiences cloud cover and fog almost all year, little and highly variable rainfall from year to year, mean monthly temperatures from 10 to 20°C, and a mean daily temperature oscillation of 7.5°C. According to Antonioletti et al (1972), the seasonality of this climate is defined by the frequency of the cloud cover and fogs, and by rainfall on 1-4 d in winter, rather than by annual changes in temperature.…”

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confidence: 72%

“…Considering that Z. compacta lives in the same habitat as Z. elegans and that its germination temperature requirements are known (De la Cuadra et al, 2017), it can be hypothesized that the germination temperature requirements of Z. elegans seeds are similar to those of Z. compacta. In other words, high germination percentages can be obtained in the temperature range between 10 and 20°C, whereas 15°C can be considered optimum and 25°C will inhibit germination.…”

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confidence: 99%

Germination Temperature and the Effect of Storage Time on the Seed Viability of Zephyra elegans (Tecophilaeaceae)

Cuadra

Vidal

Peñaloza

et al. 2018

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Zephyra elegans is a geophyte endemic to Chile that has horticultural value as a cut flower. Its natural habitat is a coastal desert climate with abundant cloud cover, little and variable precipitation, and mean monthly temperatures between 10 and 20 °C. It is hypothesized that the temperature requirements for germination of Z. elegans seeds are similar to those of Zephyra compacta, which shares the same habitat. As it is a species from a desert climate, it can be expected that its seeds remain viable during long periods of storage. The seeds used in this study were harvested in different years from plants grown from cultivated corms of Z. elegans. The germination test temperatures were 10, 15, 20, and 25 °C, and the dry storage times at room temperature (20 ± 5 °C) were 4, 16, 28, and 40 months. The temperature requirements for germination of Z. elegans seeds are similar to those of Z. compacta, which has been studied earlier, i.e., the temperature range for achieving high germination percentages is 10 to 20 °C, whereas 25 °C can be considered supraoptimal. After-ripening of the seeds occurred during dry storage, as shown by increased germination when tested at a supraoptimal temperature. The seeds had high viability after 40 months of dry storage at room temperature.

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