Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/89511
Type: Artigo de periódico
Title: Signs Of Quality Loss In Rice Seeds At Different Temperatures Through Of Enzymatic Activity And Respiration [indicativos Da Perda De Qualidade De Sementes De Arroz Sob Diferentes Temperaturas Através Da Atividade Enzimática E Respira Tória]
Author: Marini P.
Moraes C.L.
Larre C.F.
Lima M.C.
De Moraes D.M.
Do Amarante L.
Abstract: The modifications caused in the respiration, metabolic enzyme activity and physiological quality of rice seeds under different temperatures was analyzed, and the relationship between these parameters used as an indication of the deterioration process of seeds. Seeds were exposed during 24h and submitted to tests for germination, first count germination, index the germination speed, length and dry weight of shoot and roots, electrical conductivity, and respiratory and enzymatic activity. The experiment was completely randomized with four replicates and the averages compared by Tukey test (p≤0.05) with subsequent regression analysis. Rice seeds showed a decrease En este trabajo se analizan las modificaciones en la respiración, la actividad de las enzimas del metabolismo respiratorio y la calidad fisiológica de las semillas de arroz bajo diferentes temperaturas, así como el uso de la relación entre estos parámetros como indicativo del proceso de deterioro de la semillas. Las semillas fueron expuestas durante 24h a temperaturas de 15, 25, 30 y 35°C, y determinaron: germinación, primer conteo de germinación, índice de velocidad de germinación, longitud y peso seco de brotes y raíces, conductividad eléctrica, actividad respiratoria y enzimática. El diseño experimental fue completamente al azar con cuatro repeticiones y las medias se compararon mediante la prueba de Tukey (p≤0,05), con posterior análisis de regresión polinómica. Las semillas de arroz in germination and vigor in temperatures above 25°C. The activity of malate dehydrogenase enzyme increased in the plants whose seeds were exposed to 15 and 35°C (ranging from 32.55 to 39.04μmol NAD+/g/ MF/min, respectively), while the enzyme glucose-6-hosphate dehydrogenase increased with no significant differences when seeds were subjected to 15, 30 and 35°C (0.58, 0.71 and 0.74μmol NADPH/g MF/min, respectively). It can be concluded that the evaluated biochemical tests can be used to identify the deteriorating process of rice seeds and that temperatures above 25°C can deteriorate the quality of rice seeds var. Pelota.
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Rights: aberto
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Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-84874305930&partnerID=40&md5=b2053fe941a959824839cf3ce0ee6737
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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