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      Physiological changes in hybrid Brachiaria cv. Mulato II after accelerated aging to overcome dormancy Translated title: Alterações fisiológicas em sementes de Braquiaria híbrida cv. Mulato II após envelhecimento acelerado para a superação da dormência

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          Abstract

          Abstract: To evaluate the effect of accelerated aging to overcome dormancy of hybrid Brachiaria cv. Mulato II (U. brizantha x U. decumbens x U. ruziziensis), seeds were collected from two lots with and without scarification, submitted to 42 °C and high humidity (98%) for different periods (0, 24, 48, 72 and 96 h) and then dried at 30 °C to the humidity of 9.1%. The physiological changes were evaluated by tetrazolium, germination, electrical conductivity, respiratory activity and enzymatic evaluation. The exposure of the hybrid Brachiaria cv. Mulato II to accelerated aging at 42 °C and 98% relative air humidity for up to 96 hours does not alter its viability by the tetrazolium test. Accelerated aging at 42 °C and 98% of humidity for up to 48 hours favors the germination of the scarified seeds of hybrid Brachiaria cv. Mulato II, with increased expression of α-amylase enzyme and reduction of electrical conductivity values. Loss of vigor occurs in scarified seeds of hybrid Brachiaria cv. Mulato II when exposed to accelerated aging at 42 °C and 98% of humidity from 96 hours with consequent changes in enzymatic systems and increased of the respiratory rate.

          Translated abstract

          Resumo: Para avaliar o efeito do envelhecimento acelerado para a superação da dormência de Braquiaria híbrida cv. Mulato II (U. brizantha x U. decumbens x U. ruziziensis), foram utilizadas sementes de dois lotes com e sem escarificação, submetidas a temperatura de 42 °C e alta umidade (98%) por diferentes períodos (0, 24, 48, 72 e 96 h) e posteriormente secadas a 30 °C até a umidade de 9,1%. As alterações fisiológicas foram avaliadas pelos testes de tetrazólio, germinação, condutividade elétrica, atividade respiratória e avaliação enzimática. A submissão das sementes de Braquiaria híbrida cv. Mulato II ao envelhecimento acelerado a 42 oC e 98% de umidade relativa do ar por até 96 horas não altera a sua viabilidade pelo teste de tetrazólio. O envelhecimento acelerado a 42 oC e 98% de umidade relativa do ar por até 48 horas favorecem a germinação das sementes escarificadas de Braquiaria híbrida cv. Mulato II, com aumento da expressão da enzima α-amilase e redução dos valores de condutividade elétrica. Ocorre perda de vigor nas sementes escarificadas de Braquiaria híbrida cv. Mulato II quando são expostas ao envelhecimento acelerado a 42 oC e 98% de umidade relativa do ar a partir de 96 h, com consequentes alterações nos sistemas enzimáticos e aumento da taxa respiratória.

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          Most cited references32

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          Regras para análise de sementes

          (2009)
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            Animal performance and sward characteristics of two cultivars of Brachiaria brizantha (BRS Paiaguás and BRS Piatã)

            ABSTRACT The objective of the present study was to evaluate live weight gain per animal and per area and its relationship with the characteristics of pastures of Brachiaria brizantha cv. Paiaguás and Piatã. A randomized blocks experimental design was used, with two treatments and six replicates. The experimental area was 8.0 ha, divided into twelve paddocks of 0.67 ha. The grazing method used was continuous stocking, with variable stocking rate. Three tester steers were used per paddock. Sward heights were measured once a week, and the stocking rate (SR) was adjusted using regulator steers to maintain the sward height at 30 cm. Pasture samples were collected once a month, and herbage accumulation rate (HAR), percentage of leaves (PL), leaf:stem ratio (LSR), and nutritive value (NV) were determined. Animals were weighed every 28 days. No differences between the two cultivars were observed during the wet season for any of the evaluated parameters. However, cv. Paiaguás presented higher HAR and, consequently, higher SR than cv. Piatã during the dry season. As a result of its higher regrowth, cv. Paiaguás pastures presented significantly higher PL, LSR, and NV and, consequently, significantly higher average daily live weight gain. These differences resulted in higher live weight gain per area for Paiaguás grass (695 kg/ha per year) than for Piatã grass (645 kg/ha per year). Thus, Brachiaria brizantha cv. Paiaguás is a good alternative to decrease the temporary forage shortage and for the diversification of pastures in the Cerrado biome region.
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              Eletroforese e marcadores bioquímicos em plantas e microorganismos

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                jss
                Journal of Seed Science
                J. Seed Sci.
                ABRATES - Associação Brasileira de Tecnologia de Sementes (Londrina, PR, Brazil )
                2317-1537
                2317-1545
                September 2017
                : 39
                : 3
                : 244-253
                Affiliations
                [1] Lavras Minas Gerais orgnameUniversidade Federal de Lavras orgdiv1Departamento de Agricultura Brazil
                Article
                S2317-15372017000300244
                10.1590/2317-1545v39n3171313
                e5943b95-2704-4012-a48a-0d4ed5a83690

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

                History
                : 10 May 2017
                : 31 October 2016
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 32, Pages: 10
                Product

                SciELO Brazil


                germinação,condutividade elétrica,respiração,isoenzimas,forage seeds,germination,electrical conductivity,respiration,isoenzymes,sementes de forrageira

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