Maturation of seeds of Caesalpinia echinata Lam. (Brazilwood), an endangered leguminous tree from the Brazilian Atlantic Forest

Borges, Igor Ferrari; Neto, João Del Giudice; Bilia, Denise Augusta Camargo; Figueiredo-Ribeiro, Rita de Cássia L.; Barbedo, Claudio José

doi:10.1590/s1516-89132005000800001

Cited by 26 publications

(29 citation statements)

References 6 publications

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“…The patterns of development and maturation of C. echinata seeds under field conditions have been described recently (Borges et al, 2005). Table 1 indicates that maximum seed fresh and dry masses were reached nearly 60 DAA, the water content remaining practically constant during the early growth phase (till 40 DAA) and then declining slowly during the desiccation phase.…”

Section: Resultsmentioning

confidence: 87%

“…Germinability of these seeds began at 40 DAA, reaching a maximum at 48 DAA, remaining high from this phase. However, normal seedling development was observed only at 59 DAA (Table 1), close to seed shedding (Borges et al, 2005). This indicates that the last desiccation phase (from 48 DAA to 59 DAA) is crucial to improve seed vigor.…”

Section: Resultsmentioning

confidence: 98%

“…During the flowering period (August/September), individual flowers were tagged on the day of their anthesis (9 to 14 September). During the main phases of seed development (Borges et al, 2005), the pods were collected directly from the branches at 32, 40, 48, 52 and 59 d after anthesis (DAA) which is just before shedding (60-65 DAA). Seeds were also collected directly from the ground, not exceeding 24 h after shedding, and these were named recently-dispersed seeds (RDS).…”

Section: Plant Materialmentioning

confidence: 99%

“…The results were expressed as g H 2 O g -1 DM (g g -1 ). Germination (protrusion of the primary root) tests were carried out at 25 ± 1 o C under continuous light, in germination boxes (11x11x3.5 cm) on two pieces of thick germination paper saturated with distilled water (Barbedo, 2005), using four replicates of 16 seeds. Germination was evaluated every 2 d from the day of sowing and after 20 d the number of seedlings with both normal roots and shoots was registered (Barbedo, 2005).…”

Section: Analysis Of Seed Qualitymentioning

confidence: 99%

“…The effect of low temperatures on individual polypeptides and lipids should be considered. Additionally, as emphasized by Borges et al (2005), the role of the environment during development and maturation of seeds of C. echinata needs further investigation. However, results from the present study allow us to conclude that variations in soluble carbon reserves of C. echinata seeds are related to the maturation process and seed quality and might contribute to an understanding of the involvement of these compounds in the conservation of the seeds.…”

Section: Embryonic Axis Cotyledonsmentioning

confidence: 99%

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Variations in sugars and cyclitols during development and maturation of seeds of brazilwood (Caesalpinia echinata Lam., Leguminosae)

Borges¹,

Barbedo

Richter

et al. 2006

Braz. J. Plant Physiol.

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Variações nos açúcares e ciclitóis durante o desenvolvimento e maturação de sementes de pau-brasil (Caesalpinia echinata Lam., Leguminosae). Sementes de Caesalpinia echinata são tolerantes à dessecação, mantendo sua viabilidade com níveis de 0,08 g H 2 O g -1 MS. Quando armazenadas sob condições de laboratório perdem a viabilidade em um mês, enquanto sob baixas temperaturas a capacidade germinativa é mantida por dois anos. A concentração e a composição de açúcares solúveis, ciclitóis livres e ciclitóis galactosilados durante o desenvolvimento e a maturação dessas sementes foram analisadas no presente trabalho, com o propósito de compreender-se o envolvimento daqueles compostos na maturação e na qualidade da semente. Inflorescências foram marcadas na antese e posteriormente coletadas desde 32 até 59 d após antese (DAA) e após a deiscência. A maturidade fisiológica de sementes de C. echinata ocorreu entre 60-65 DAA, imediatamente antes da dispersão, quando as sementes apresentavam 0,43-0,67 g H 2 O g -1 MS. Carboidratos solúveis totais corresponderam a cerca de 10% da matéria seca das sementes. Análises por cromatografia gasosa e espectroscopia de massas permitiram quantificar 12 compostos presentes nos eixos e cotilédones durante o desenvolvimento das sementes. Estes incluem frutose, glicose, sacarose, rafinose, os ciclitóis mio-inositol, D-chiro-inositol, D-pinitol e os ciclitóis galactosilados, galacto-pinitol A, galacto-pinitol B e ciceritol. Sacarose foi detectada em grandes proporções durante todo o processo de desenvolvimento das sementes. Traços de rafinose foram detectados, principalmente em sementes imaturas. D-chiroinositol e mio-inositol foram encontrados em baixas quantidades e pinitol aumentou de forma contínua nos eixos e nos cotilédones. Seeds of Caesalpinia echinata are tolerant to desiccation, keeping their viability up to 0.08 g H 2 O g -1 DM. When stored under laboratory conditions they lose their viability within one month, while under low temperatures germination ability is maintained during two years of storage. Here, we report on the variations of soluble carbohydrates, cyclitols and cyclitol galactosides in seeds of C. echinata during development and maturation, aiming for a better understanding of the involvement of these compounds in the maturation process and seed quality. Individual flowers were tagged on the day of anthesis and pods were collected directly from the branches from 32 to 59 d after anthesis (DAA). Seeds were also collected after shedding. The physiological maturity of C. echinata seeds occurred 60-65 DAA, immediately before shedding, when seeds had 0.43-0.67 g H 2 O g -1 DM. Soluble carbohydrates made up about 10% of the seed dry mass. Gas chromatography and mass spectrometry allowed the identification and quantification of 12 soluble carbon compounds present in both the axis and cotyledons of developing C. echinata seeds. These included fructose, glucose, sucrose, raffinose, the cyclitols myo-inositol, D-chiro-inositol, D-pinitol, and the cyclitol galactosides, galacto-...

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 98%

Section: Plant Materialmentioning

confidence: 99%

Section: Analysis Of Seed Qualitymentioning

confidence: 99%

Section: Embryonic Axis Cotyledonsmentioning

confidence: 99%

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