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      Accelerated aging as vigor test for sunn hemp seeds Translated title: Envelhecimento acelerado como teste de vigor para sementes de crotalária

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          Abstract

          ABSTRACT: This study aimed to determine the most appropriate method to assess the sunn hemp ( Crotalaria juncea L.) seed vigor in the accelerated aging test. Five seed lots from harvest 2007/2008 were evaluated for germination, vigor and seedling emergence in the field. Accelerated aging test was performed at 41°C during 48, 72 and 96 hours, with and without sodium chloride saturated solution. Then, the promising procedure was also performed for 2008/2009 and 2009/2010 harvests. In the traditional accelerated aging test, the no-uniform water acquisition by the seeds adversely affected results. Accelerated aging test with sodium chloride saturated solution is the most appropriate method to evaluate the physiological potential of sunn hemp seeds, and the combination of 41°C and 96 hours is efficient for separating of seed lots in different vigor levels.

          Translated abstract

          RESUMO: Esta pesquisa objetivou determinar os procedimentos mais adequados para avaliação do vigor de sementes de crotalária ( Crotalaria juncea L.) pelo teste de envelhecimento acelerado. Para tanto, cinco lotes de sementes foram avaliados quanto à germinação, vigor e emergência de plântulas em campo. O procedimento do teste de envelhecimento acelerado foi testado com 41°C durante 48, 72 e 96 horas, com e sem o uso de solução saturada de cloreto de sódio. O envelhecimento acelerado com o uso de solução saturada de cloreto de sódio é o método mais adequado para avaliação do potencial fisiológico de sementes de crotalária, sendo a combinação 41°C e 96 horas eficiente na classificação de lotes em diferentes níveis de vigor.

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          Most cited references24

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          Seed vigor testing: an overview of the past, present and future perspective

          The assessment of seed vigor has many important implications to the seed industry as a basic monitoring of seed physiological potential during different phases of seed production and a support for strategic decisions regarding the selection of high quality seedlots to meet the consumer demand. The potential attributes of seed vigor as a fundamental physiological seed characteristic and its association with field stand establishment and crop productivity has been worldwide recognized from the 1960s onward. This led to the diversification of research approaches involving the synchronization of different physiological characteristics and events that determine the potential for high performance during seed storage and after sowing. The basic objective of vigor testing is to provide a consistent identification of differences in physiological potential among seedlots of commercial value and this represents a more sensitive parameter than the germination test. There are various procedures to assess seed vigor including those that directly or indirectly evaluate seed metabolic state or identify seed tolerance to specific stress(es). At the same time, in more recent years, new knowledge has come from molecular biology, biotechnology, biophysics and seed and seedling imaging analyses; these approaches has been important complements to traditional seed research.. This text has the purpose to emphasize the role of Brazilian research in seed vigor, whose competence is internationally recognized, and to provide an overview of the evolution of knowledge also attempting to highlight events that contributed to the advancement of research on the subject.
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            Ministério da Agricultura, Pecuária e Abastecimento. Secretaria de Defesa Agropecuária.

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              Automated system of seedling image analysis (SVIS) and electrical conductivity to assess sun hemp seed vigor

              The development of new procedures for quickly obtaining accurate information on the physiological potential of seed lots is essential for developing quality control programs for the seed industry. In this study, the effectiveness of an automated system of seedling image analysis (Seed Vigor Imaging System - SVIS) in determining the physiological potential of sun hemp seeds and its relationship with electrical conductivity tests, were evaluated. SVIS evaluations were performed three and four days after sowing and data on the vigor index and the length and uniformity of seedling growth were collected. The electrical conductivity test was made on 50 seed replicates placed in containers with 75 mL of deionised water at 25 ºC and readings were taken after 1, 2, 4, 8 and 16 hours of imbibition. Electrical conductivity measurements at 4 or 8 hours and the use of the SVIS on 3-day old seedlings can effectively detect differences in vigor between different sun hemp seed lots.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                cr
                Ciência Rural
                Cienc. Rural
                Universidade Federal de Santa Maria
                1678-4596
                2017
                : 47
                : 1
                : e20151527
                Affiliations
                [1 ] Universidade Estadual Paulista Brazil
                [2 ] Universidade Estadual de Santa Cruz Brazil
                Article
                S0103-84782017000100402
                10.1590/0103-8478cr20151527
                648e1d3f-44d3-42e1-afb8-d2d6c59b08dc

                This work is licensed under a Creative Commons Attribution 4.0 International License.

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                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0103-8478&lng=en
                Categories
                AGRONOMY

                Horticulture
                Crotalaria juncea L.,forrageira,potencial fisiológico,germinação,padronização.,forage crop,physiological potential,germination,standization

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