|
|
|
|
|
| Silva,Patrícia Pereira da; Sekita,Marcelo Coelho; Dias,Denise Cunha Fernandes dos Santos; Nascimento,Warley Marcos. |
| ABSTRACT In carrot seed production, harvesting of the umbels is generally staggered, or sometimes the whole plant is harvested with the umbels at different stages of maturation; in that case, there is a risk of harvesting immature seeds and of losses due to natural dehiscent, or to physiological deterioration as a result of unfavourable environmental factors. The present study aimed to evaluate the physiological and biochemical changes related to the maturation of 'Planalto' carrot seeds from diferent umbels. The samples were collected 120 days after anthesis, with the primary, secondary and tertiary umbels being harvested separately. Seeds were analysed for germination, first count and germination rate, at temperatures of 25 ºC (optimum) to 35 ºC... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Daucus carota L.; Physiological quality; Enzyme activity. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000200407 |
| |
|
|
| Silva,Patrícia Pereira da; Barros,Antonio Carlos Souza Albuquerque; Dias,Denise Cunha Fernandes dos Santos; Sekita,Marcelo Coelho; Nascimento,Warley Marcos. |
| ABSTRACT This study aimed to evaluate biochemical changes in seeds of the pumpkin hybrid, 'Jabras', from fruit harvested at different stages of maturation (15, 30, 45, 60 and 75 days after anthesis). Thirty fruit were harvested at each stage, with the seeds from 15 of the fruit being extracted immediately. The remaining 15 were stored for twenty days in plastic boxes and the seeds extracted after this period. After processing and drying the seeds, the following were determined: moisture content, germination, first count and antioxidant enzyme activity (peroxidase, ascorbate peroxidase, catalase and superoxide dismutase). Seeds from the fruit harvested at 30 DAA displayed low values for germination and vigour and high antioxidant enzyme activity, indicating... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cucurbita maxima; Cucurbita moschata; Antioxidant enzymes. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000300558 |
| |
|
|
| Miranda,Rafaela Marques de; Dias,Denise Cunha Fernandes dos Santos; Picoli,Edgard Augusto de Toledo; Silva,Patrícia Pereira da; Nascimento,Warley Marcos. |
| ABSTRACT The adequate time for carrot seed harvest influences its physiological quality. The objective of this study was to evaluate physiological, anatomical and histochemical changes in carrot seeds harvested at different stages of development and to establish the most appropriate harvest time. Secondary umbels were harvested at 14, 21, 28, 35, 42, 49, 56 and 63 days after anthesis (DAA). For seed anatomical and histochemical characterization, sections were stained with Toluidine blue stain, Xylidine Ponceau, Lugol’s iodine, Sudan Black B and submitted to polarized light. Seed moisture content, seed dry matter, germination, first count, emergence percentage and emergence speed index of seedlings were evaluated. Cultivar Brasília carrot seeds at 14 DAA... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Maturity; Harvest; Reserve substances; Germination; Vigor. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542017000200169 |
| |
|
|
|
