Effect of storage of achenes of Bidens gardneri Baker on light sensitivity during germination

Sassaki, Regina Miyuki; Zaidan, Lilian Beatriz Penteado; Felippe, G. M.

doi:10.1590/s0100-84041999000100010

Cited by 7 publications

(21 citation statements)

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“…The behaviour of the achenes of Bidens gardneri to light was changed when stored in soil for one month (Sassaki et al 1999a). These achenes buried in the soil presented a moisture content of ca.…”

Section: Resultsmentioning

confidence: 99%

“…These achenes buried in the soil presented a moisture content of ca. 50% while the ones stored dry in glass bottles in darkness at 4°C had a moisture content of 10%; the achenes stored at 4°C were light sensitive during germination while in those stored for one month in the soil the germination was the same both in light and in darkness (Sassaki et al 1999a). Thus one possibility was that the change in light sensitivity behaviour could be caused by the high moisture content of the seeds.…”

Section: Resultsmentioning

confidence: 99%

“…B. gardneri population of Itirapina is located in a very disturbed area while the Moji Guaçu population in a preserved area of cerrado. In general, changes in viability and light sensitivity during storage were followed in achenes of median sizes (9 and 10 mm), but 5-6 mm and 12-13 mm long achenes were used in one experiment (see Sassaki et al 1999a).…”

Section: Methodsmentioning

confidence: 99%

“…The storage conditions of the achenes varied in each experiment. Moisture content and imbibition were determined according to Sassaki et al (1999a). Moisture content (%) of the achenes was measured in three replications of 20 achenes.…”

Section: Methodsmentioning

confidence: 99%

“…B. gardneri presents heteroblastism, producing long and short achenes; germination in light was high when long achenes were used and very low with short achenes (Felippe 1990). Sassaki et al (1999a) showed that the achenes buried in the soil for one month could germinate in darkness. During this storage period the achenes were under the influence of alternating temperatures and showed a high moisture content.…”

Section: Introductionmentioning

confidence: 99%

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Effects of moisture content and temperature during storage on germination of the achenes of Bidens gardneri Baker

Rondon¹,

Sassaki²,

Zaidan³

et al. 2001

Rev. bras. Bot.

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-(Effects of moisture content and temperature during storage on germination of the achenes of Bidens gardneri Baker). Bidens gardneri is a herbaceous species of the cerrados, whose seeds are light sensitive at 25°C, but they become indifferent to light when stored in soil. In this work the effects of moisture content, temperature and light (during storage) upon light sensitivity during germination were studied. Ripe achenes were collected in the cerrados of Itirapina and Moji Guaçu, State of São Paulo, Brazil. The storage conditions of the achenes varied in each experiment. Achenes were stored in darkness or light, in closed bottles, at 4°C, 20/30°C or 25°C. Achenes were imbibed for 24 h at 4°C, 25°C or 20/30°C (in darkness) and then stored for 1, 10, 20, 30 and 40 days (40 days only for 4°C and 25°C). Germination tests were conducted at 25°C and 20/30°C. The achenes not previously imbibed showed sensitivity to light during germination. High moisture content did not affect light sensitivity of the achenes during germination but high moisture content together with storage temperatures of 25°C and 20/30°C had a deleterious effect upon the longevity of the achenes. Alternate temperatures during germination did not change the light sensitivity of newly collected achenes from Itirapina but changed the light sensitivity of the achenes stored imbibed at 4°C in darkness. Alternate temperatures during storage of achenes with low moisture content did not change their photoblastism when germination was carried out at 25°C. Alternate temperatures during storage of achenes with high moisture content followed by alternate temperatures during germination changed the light sensitivity of the achenes.RESUMO -(Efeito do conteúdo de água e temperatura durante o armazenamento na germinação dos aquênios de Bidens gardneri Baker). Bidens gardneri é uma espécie herbácea dos cerrados, cujas sementes são fotoblásticas positivas a 25°C, mas tornam-se indiferentes à luz quando armazenadas em solo. Neste trabalho, foram estudados os efeitos do conteúdo de água dos aquênios, da temperatura e da luz (durante o armazenamento) na sensibilidade à luz durante a germinação. Os aquênios foram coletados nos cerrados de Itirapina e de Moji Guaçu, estado de São Paulo, Brasil. As condições de armazenamento variaram em cada experimento. Os aquênios foram armazenados no escuro ou em luz, em vidros fechados a 4°C, 25°C e 20/30°C. Os aquênios foram embebidos por 24 horas a 4°C, 25°C e 20/30°C (no escuro) e então armazenados por 1, 10, 20, 30 e 40 dias (40 dias somente para 4°C e 25°C). Os testes de germinação foram conduzidos a 25°C e 20/30°C. Os aquênios que não foram embebidos apresentaram sensibilidade à luz durante a germinação. O conteúdo alto de água durante o armazenamento não afetou a resposta à luz dos aquênios durante a germinação, mas o conteúdo alto de água em temperaturas de armazenamento de 25°C e 20/30°C tiveram efeito deletério na longevidade dos mesmos. As temperaturas alternadas durante a germinação não alteraram a resposta à lu...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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