2001
DOI: 10.1590/s0102-33062001000200001
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Abstract: C were used, the higher temperature being in light at a radiating intensity of 40 to 60 µmol.m -2 .s -1 . Only A. gratissima showed positive photoblastic behavior, but higher germination was found at alternating temperatures. Both, C. sylvestris and P. leiocarpa at constant temperatures germinated only at 20 or 25 o C. B. forficata seeds germinated more than 80% from 15°C to 30 O C constant or when one of the shift temperatures was on that range. Scarified seeds of D. viscosa germinated at the same level from … Show more

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Cited by 31 publications
(21 citation statements)
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“…In all treatments, seeds exposed to light (photoperiod of 16 hours) presented the greatest percentage of germination, on average 60%, not statistically differing (p≤ 0.05) among themselves, but differing from treatments under continuous darkness, where the highest germination rate was 4%. These results do not corroborate with those obtained by Rosa and Ferreira (2001), who investigated germination of many native species of Rio Grande do Sul state and observed that the seeds of this species germinated, regardless of the light regime, classifying them as neutral photoblastic. Imatoni et al (2009) investigated the germination of Casearia sylvestris seeds from two regions, Paraná and São Paulo, and observed that seeds originating from Parana did not germinate in the dark at a temperature of Paranhos, J. T. et al 1194 33ºC and in all treatments the percentages of germination did not exceed 40%.…”
Section: Resultscontrasting
confidence: 96%
“…In all treatments, seeds exposed to light (photoperiod of 16 hours) presented the greatest percentage of germination, on average 60%, not statistically differing (p≤ 0.05) among themselves, but differing from treatments under continuous darkness, where the highest germination rate was 4%. These results do not corroborate with those obtained by Rosa and Ferreira (2001), who investigated germination of many native species of Rio Grande do Sul state and observed that the seeds of this species germinated, regardless of the light regime, classifying them as neutral photoblastic. Imatoni et al (2009) investigated the germination of Casearia sylvestris seeds from two regions, Paraná and São Paulo, and observed that seeds originating from Parana did not germinate in the dark at a temperature of Paranhos, J. T. et al 1194 33ºC and in all treatments the percentages of germination did not exceed 40%.…”
Section: Resultscontrasting
confidence: 96%
“…Sementes pequenas, em geral, necessitam de luz para germinar (Thompson & Grime 1983;Bewley & Black 1994;Rosa & Ferreira 2001) e o tamanho das sementes pode estar relacionado às condições ambientais mais favoráveis ao estabelecimento da plântula (Westoby et al 1992). Sementes grandes estão associadas com hábitats sombreados (Leishman et al 2000), enquanto as de pequeno tamanho são associadas com hábitats abertos Seiwa & Kikuzawa 1996).…”
Section: Discussionunclassified
“…Em geral, a luz é necessária para a germinação de sementes pequenas (Thompson & Grime 1983;Bewley & Black 1994, Rosa & Ferreira 2001, cujas espécies estão associadas a ambientes abertos (Baskin & Baskin 1971) ou perturbados (Fenner 1995). A relação entre germinação e temperatura está freqüentemente associada às temperaturas a que as plantas ficam expostas durante a fase de crescimento (Baskin & Baskin 1988;Angosto & Matilla 1993;Teketay 1998a;Villalobos & Peláez 2001).…”
Section: Introductionunclassified
“…No entanto, o crescimento da população humana e da ocupação de áreas naturais aumenta a pressão destrutiva sobre esta flora (Rosa & Ferreira 2001).…”
Section: Introductionunclassified
“…Algumas dessas sementes mantidas no solo podem, em determinadas situações, embeberem água e germinarem em intervalos sucessivos, quando as condições ambientais passarem a favoráveis. Há casos em que as sementes, se coletadas com frutos novos, podem não apresentar dormência como foi verificado em Bauhinia forficata Link (Rosa & Ferreira 2001).…”
Section: Introductionunclassified