Induction of a light requirement during seed development and its ecological consequences

Cresswell, E.; Grime, J. P.

doi:10.1038/291583a0

Cited by 122 publications

(65 citation statements)

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“…The light-filtering properties of the maternal tissues surrounding the seeds could be responsible for sensitivity of germination to light (Cresswell and Grime 1981). Results of this study indicated that the response to light during seed germination of S. rubescens depended on the perianth colour.…”

Section: Discussionmentioning

confidence: 87%

Perianth colour affects germination behaviour in wind-pollinated Salsola rubescens in Arabian deserts

El‐Keblawy

Bhatt

Gairola

2014

Botany

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Salsola rubescens Franch. is a wind-pollinated halophytic shrub that produces fruits with red and yellow winged perianths. Germinability of seeds from both fruit types was determined under various light, temperature, and salinity treatments. Red seeds, with and without winged perianths, were heavier than yellow seeds. Germination percentage and germination rate index (speed) were significantly affected by the perianth colour, presence of wings, and temperature and light of incubation and most of their interactions. Germination percentage was greater for yellow-winged seeds than for red-winged seeds. Wing removal significantly enhanced the germination percentage and germination speed in the two types. The presence of wings enhanced germination at lower temperatures, but wing absence enhanced germination at higher temperatures. Wing removal enhanced germination to a greater degree in yellow than in red seeds. There was no light requirement during germination of red-winged seeds, but yellow-winged seeds germinated significantly more in light than in darkness. Red-winged and dewinged seeds were more tolerant to salinity than yellow seeds. Removal of wings significantly increased salinity tolerance for seeds of both wing colours. It is concluded that the showy perianth colours have an ecological role in wind-pollinated plants in regulating dormancy and germination behaviour in the heterogeneous unpredictable hyperarid deserts.Résumé : Le Salsola rubescens Franch., un arbuste halophyte pollinisé par le vent, produit des fruits avec périanthes ailés rouges ou jaunes. Les auteurs ont déterminé le potentiel germinatif des deux types de graines sous différents traitements de lumière, de temperature, et de salinité. Les graines rouges, avec ou sans périanthes ailés, sont plus lourdes comparativement aux graines jaunes. Le pourcentage de germination et l'index du taux de germination (vitesse) sont affectés de façon significative par la couleur du périanthe, la présence des ailes, ainsi que par la température et la lumière d'incubation incluant la plupart de leurs interactions. Le pourcentage de germination est plus grand chez les graines à ailes jaunes comparativement aux graines à ailes rouges. L'ablation des ailes augmente significativement le pourcentage et la vitesse de germination chez les deux types. La présence des ailes augmente la germination aux faibles températures, mais l'absence des ailes augmente la germination aux températures plus élevées. L'ablation des ailes augmente la germination à un plus fort degré chez les graines jaunes que chez les rouges. On n'observe pas de besoin en lumière au cours de la germination des graines à ailes rouges, mais les graines à ailes jaunes germent significativement plus à la lumière qu'à l'obscurité. Les graines rouges et les graines privées de leurs ailes s'avèrent plus tolérantes à la salinité que les graines jaunes. L'ablation des ailes augmente significativement la tolérance à la salinité chez les graines aux ailes des deux couleurs. On conclut que les couleurs voyantes des...

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Section: Discussionmentioning

confidence: 87%

Perianth colour affects germination behaviour in wind-pollinated Salsola rubescens in Arabian deserts

El‐Keblawy

Bhatt

Gairola

2014

Botany

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“…Also, the upright growth of long, narrow cotyledons allows seedlings to quickly gain access to light through competing vegetation (Gross and Werner 1982). Although in Britain Cresswell and Grime (1981) reported that germination of T. pratensis was strongly inhibited in the dark, Qi and Upadhyaya (1993), working with seeds from British Columbia, did not find that light stimulated germination.…”

Section: Calculation Of a Reynolds Number For T Dubius Approximatelymentioning

confidence: 98%

The biology of Canadian weeds. 110. Tragopogon dubius Scop., Tragopogon pratensis L., and Tragopogon porrifolius L.

Clements¹,

Upadhyaya²,

Bos³

1999

Can. J. Plant Sci.

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Introduced from Eurasia, T. pratensis and T. dubius have become established in all provinces in Canada except Newfoundland and the territories. Tragopogon porrifolius tends to be more local, but is also found in southern areas of most provinces. Tragopogon species hybridize readily, and the tetraploid species T. mirus and T. miscellus have resulted from crosses among the three diploid Tragopogon species in North America. Salsify species produce relatively large umbrella-like pappuses which promote longdistance dispersal. These species also invade rangeland, and are considered noxious weeds in some parts of Canada.

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“…Médias originais. Cresswell & Grime (1981), as sementes que amadurecem no interior de tecidos verdes teriam, em tese, a maior parte do fitocromo na forma inativa (Fv), necessitando, portanto, do estímulo luminoso para a germinação. As sementes de A. esperanzae desenvolvem-se em estrutura de coloração verde e, talvez por isso, tenham necessitado do estímulo luminoso para germinar.…”

Section: Variávelunclassified

“…Jesus & Piña-Rodrigues (1991) citaram que a germinação de sementes, em relação à luz, é resposta ecofisiológica da espécie, e tem estreita correspondência com o posicionamento no estádio sucessional da floresta. Em sementes de espécies do cerrado, Felippe & Silva (1984) citaram que a resposta à luz depende da temperatura nas quais as sementes foram expostas.…”

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Germinação de sementes de Aristolochia esperanzae O. Kuntze em diferentes temperaturas e condições de luminosidade

Maekawa

Albuquerque

Coelho

2010

Rev. bras. plantas med.

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RESUMO:O objetivo deste estudo foi verificar a influência da temperatura e da luz, em interação com a temperatura e de forma isolada, bem como, determinar a temperatura mais adequada para a condução do teste de germinação de sementes de Aristolochia esperanzae O. Kuntze (cipó mil-homens). Foram realizados três ensaios. No primeiro, as temperaturas utilizadas foram 15, 20, 25, 30, 35 e 40ºC. No segundo, foi avaliada a germinação das sementes nas temperaturas de 25, 30 e 35ºC, na presença e ausência de luz e no terceiro ensaio, foram testadas quatro condições de luminosidade, de forma isolada: (a) luz branca; (b) luz vermelha; (c) vermelho-distante e (d) ausência de luz, na temperatura de 25ºC. Em ambos os ensaios, foram avaliados, durante 30 dias, as porcentagens de sementes germinadas, de plântulas normais e de sementes não germinadas, e os tempos médios de sementes germinadas e de plântulas normais. Nas temperaturas de 15ºC e de 40ºC, não ocorreram germinação de sementes de A. esperanzae. O melhor resultado para sementes germinadas e para formação de plântulas normais (96%) foi obtido na temperatura de 30ºC. A presença de luz e as temperaturas de 25ºC e 30ºC favoreceram a germinação de sementes e a formação de plântulas normais. As sementes de Aristolochia esperanzae tiveram sua germinação inibida na ausência de luz, caracterizando-as como fotoblásticas positivas. Palavras-chave: Aristolochiaceae, viabilidade, germinação, plantas medicinaisABSTRACT: Germination of Aristolochia esperanzae O. Kuntze seeds under different temperatures and light conditions. The aim of this study was to verify the influence of temperature and light, interacting or separately, as well as to establish the most suitable temperature to conduct the germination test of Aristolochia esperanzae O. Kuntze ("cipó mil-homens") seeds. Three assays were performed. In the first one, temperatures were 15, 20, 25, 30, 35 and 40ºC. In the second assay, seed germination was evaluated at 25, 30 and 35ºC, in the presence and absence of light. In the third assay, four light conditions were tested separately: (a) white light; (b) red light; (c) far-red light; and (d) no light, at 25ºC. In all assays, the percentages of germinated seeds, normal seedlings and non-germinated seeds, besides the mean times of germinated seeds and normal seedlings, were evaluated during 30 days. At 15ºC and 40ºC, there was no A. esperanzae seed germination. The best result for germinated seeds and normal seedlings (96%) was obtained at 30ºC. The presence of light and the temperatures 25ºC and 30ºC favored seed germination and normal seedling formation. Aristolochia esperanzae seeds had their germination inhibited in the absence of light, which characterizes them as positive photoblastic.

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Induction of a light requirement during seed development and its ecological consequences

Cited by 122 publications

References 18 publications

Perianth colour affects germination behaviour in wind-pollinated Salsola rubescens in Arabian deserts

Perianth colour affects germination behaviour in wind-pollinated Salsola rubescens in Arabian deserts

The biology of Canadian weeds. 110. Tragopogon dubius Scop., Tragopogon pratensis L., and Tragopogon porrifolius L.

Germinação de sementes de Aristolochia esperanzae O. Kuntze em diferentes temperaturas e condições de luminosidade

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