Teste de envelhecimento acelerado na avaliação da qualidade de sementes de pinhão manso (Jatropha curcas l.)
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Data
2012-08-31
Autores
Santos, Fabiana Alvão dos [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O pinhão manso é um gênero da família Euphorbiaceae, tem demonstrado grande potencial para produção de óleo devido ao alto teor contido nas sementes. Outro aspecto importante é que para a instalação de lavouras comerciais é fundamental que se disponha de sementes de alta qualidade, as quais devem apresentar alta germinação e alto vigor. Neste sentido, o uso de testes que reflitam o real potencial fisiológico das sementes é imprescindível para favorecer aos produtores informações adequadas. O presente trabalho teve por objetivo analisar a metodologia do teste de envelhecimento acelerado para avaliação do potencial fisiológico de sementes de pinhão manso (Jatropha curcas L.). Foram utilizados três lotes de sementes com épocas de colheita diferentes, procedentes da Fazenda de Ensino, Pesquisa e Extensão da Faculdade de Engenharia/UNESP, Campus de Ilha Solteira, localizada no Município de Selvíra/MS, sendo submetidas aos testes de emergência, primeira contagem de emergência de plântulas, teor de água das sementes, comprimento da parte aérea das plântulas, comprimento radicular das plântulas, comprimento total das plântulas, número de folhas por plântulas, massa verde de plântulas e massa seca de plântulas e envelhecimento acelerado, empregando-se os períodos de exposição de 48, 60, 72 e 84h, nas temperaturas de 38, 40, 42 e 44°C, com e sem solução salina (NaCl). Os resultados mostraram que o aumento da temperatura como do tempo de exposição levam a redução no desempenho das sementes. Os melhores resultados para realizar o teste de envelhecimento acelerado das sementes indicam a combinação 40°C/48h ou 42°C/48h, utilizando água ou solução saturada de NaCl. Os resultados indicam ainda que se deve fazer a coletas dos frutos de pinhão manso com a coloração do epicarpo maduro ou...
Jatropha curcas a gênero of the family Euphorbiaceae, which has shown great potential for oil production due to its high oil levels in the seeds. Another important aspect to consider is the provision of high quality seeds as essential in order to have the installation of the commercial crops, which must present high germination and high vigor. In this sense, the use of tests that reflect the real physiological potential of seeds is indispensable to provide producers with adequate information. Te goal of this study is to analyze the methodology for the accelerated aging test to evaluate the physiologic potential of Jathorpa seeds (Jathorpa curcas L.). Three lots of seeds were used with different harvest times, from the Farm of Education, Research and Extension Faculty of Enginelering/UNESP, Ilha Solteira Campus locaed in the municipality of Selvira/MS, submitted to the emergence test, first counting of emergence of seedlings, water content of seeds, length of aerial part and length of the root of the plantules, total length, of the plantules, number of leaves, green mass of plantule and dry mass and accelerated aging, applying the exposure periods of 48, 60, 72 and 84h, at 38, 40, 42 and 44oC, with and without salt solution saturated (NaCl). The results showed that the increase of temperature as well as the time of exposure led to a reduction in the performance of the seeds. The set of results indicated the combination of water or saturated NaCl solution at 40oC/48h and 42oC/48h as producing the best results to perform the accelerated aging test of seeds and to give good results in test force of this kind, the results of work showing that the samples must fruit Jatropha with mature or epicarp color is yellow or brown pigmentation in accordance... (Complete abstract click electronic access below)
Jatropha curcas a gênero of the family Euphorbiaceae, which has shown great potential for oil production due to its high oil levels in the seeds. Another important aspect to consider is the provision of high quality seeds as essential in order to have the installation of the commercial crops, which must present high germination and high vigor. In this sense, the use of tests that reflect the real physiological potential of seeds is indispensable to provide producers with adequate information. Te goal of this study is to analyze the methodology for the accelerated aging test to evaluate the physiologic potential of Jathorpa seeds (Jathorpa curcas L.). Three lots of seeds were used with different harvest times, from the Farm of Education, Research and Extension Faculty of Enginelering/UNESP, Ilha Solteira Campus locaed in the municipality of Selvira/MS, submitted to the emergence test, first counting of emergence of seedlings, water content of seeds, length of aerial part and length of the root of the plantules, total length, of the plantules, number of leaves, green mass of plantule and dry mass and accelerated aging, applying the exposure periods of 48, 60, 72 and 84h, at 38, 40, 42 and 44oC, with and without salt solution saturated (NaCl). The results showed that the increase of temperature as well as the time of exposure led to a reduction in the performance of the seeds. The set of results indicated the combination of water or saturated NaCl solution at 40oC/48h and 42oC/48h as producing the best results to perform the accelerated aging test of seeds and to give good results in test force of this kind, the results of work showing that the samples must fruit Jatropha with mature or epicarp color is yellow or brown pigmentation in accordance... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Pinhão-manso, Sementes - Envelhecimento, Sementes - Qualidade, Germinação, Jatropha curvas L
Como citar
SANTOS, Fabiana Alvão dos. Teste de envelhecimento acelerado na avaliação da qualidade de sementes de pinhão manso (Jatropha curcas l.). 2012. 71 f. Dissertação (mestrado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Faculdade de Engenharia de Ilha Solteira, 2012.