Physiological changes in hybrid Brachiaria cv. Mulato II after accelerated aging to overcome dormancy

Physiological changes in hybrid Brachiaria cv. Mulato II after accelerated aging to overcome dormancy

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 9...

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Bibliographic Details
Published in:Journal of seed science Vol. 39; no. 3; pp. 244 - 253
Main Authors: Pereira, Diego de Sousa, Carvalho, Maria Laene Moreira de, Guimarães, Renato Mendes, Oliveira, Ariadne Santos, Reis, Gabriel Abreu
Format: Journal Article
Language:English
Published: ABRATES - Associação Brasileira de Tecnologia de Sementes 01-09-2017
Associação Brasileira de Tecnologia de Sementes
Subjects:
electrical conductivity
forage seeds
germination
isoenzymes
PLANT SCIENCES
respiration
isoenzimas
germination
respiração
germinação
isoenzymes
condutividade elétrica
forage seeds
respiration
electrical conductivity
sementes de forrageira
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Summary: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.
ISSN:2317-1545
2317-1545
DOI:10.1590/2317-1545v39n3171313