Maturação e germinação de embriões somáticos do mamoeiro 'Golden THB'
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Data
2014-02-20
Autores
Chagas, Kristhiano
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Universidade Federal do Espírito Santo
Resumo
This work aimed to evaluate the maturation and germination of somatic embryos of
papaya 'Golden THB'. To obtain the somatic embryos, cotyledons of seedlings of
papaya obtained from in vitro germination in MS basal medium, were inoculated into
induction medium containing MS salts; myo-inositol (0.55 mM), sucrose (87.5 mM),
agar Vetec ® (8 g L-1) supplemented with 4 -CPA (p-chlorophenoxyacetic acid) (25
mM). After 50 days, the calli were transferred to maturation medium: Experiment 1
(MM1) consisting of MS medium, ABA (0.5 mM, CA (15 g L-1) and the treatments
supplemented with different concentrations of PEG 6000 (0, 40, 50, 60 and 70 g L-1)
for 45 days; Experiment 2 (MM2), consisting of MS medium, ABA (0.5 mM), CA (15 g
L -1) and the supplemented treatments different concentrations of malt extract (0.0,
0.1, 0.2, 0.3 and 0.4 g L-1). During 45 days the treatments consisted of four replicates
of three Petri dishes of 100 mm × 20 mm, containing four calli. The normal
cotyledonary embryos generated in MM2 supplemented with ABA (0.5 mM), CA (15 g
-1) and malt extract (0.2 g L-1) were transferred to the germination medium (GM)
L
formed by the total concentration of medium MS salts, sucrose (87.5 mM), myo-
inositol (0.0, 0.275, 0.550 and 0.825 mM) and agar Vetec ® (8 g L-1). The data were
subjected to analysis of variance and means studied by regression analysis.
Treatment with PEG were lower and harmed the process of formation of embryos
and their use at a concentration of 70 g L-1 reduces by 31.85% of the total production
and normal somatic embryos of papaya 'Golden THB'. So for somatic embryogenesis
of papaya 'Goden THB' not recommended in the maturation medium containing PEG
6000. Adding malt extract (0.17 g L-1) in the maturation medium potentiated the
embryonic development of papaya 'Golden THB', 45.40 ES callus-1. Identify the
occurrence of secondary somatic embryogenesis and the formation of abnormal
somatic embryos. The supplementation of myo-inositol (0.45 mM) in MS medium
yielded significant gains in the percentage of germination of somatic embryos and
conversion into plantlets papaya 'Golden THB'.
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Palavras-chave
Somatic embryogenesis , Carbohydrates , Auxin , Carica papaya L.
Citação
CHAGAS, Kristhiano. Maturação e germinação de embriões somáticos do mamoeiro 'Golden THB'. 2014. 39 f. Dissertação (Mestrado em Agricultura Tropical) - Programa de Pós-Graduação em Agricultura Tropical, Universidade Federal do Espírito Santo, São Mateus, 2014.