Escarificação e ácido giberélico na emergência e crescimento de plântulas de biribá
Data
2015-10
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Resumo
In Annonaceae seed germination there inhibitory
substances that cause dormancy, which together with a tough
seed coat and antagonistic factors provide the rapid and uniform
germination. The objective of this research was to study the
effect of mechanical scarification and seed soaking in gibberellic
acid on emergence and early growth of Biribá plantlets. The
experiment was conducted in the Horticulture Sector of the
School of Agronomy, Universidade Federal de Goiás (EA/UFG),
Goiânia, GO. The seeds used in the test were manually extracted
from fruits harvested in the municipality of Itapuranga, GO.
Treatments included a combination of factors scarification (seeds
scarified mechanically or not) and seed soaking for 20 hours with
increasing concentrations of gibberellic acid (0, 125, 250, 500
and 1000mg L -1 ) in experimental design of randomized blocks.
The characteristics evaluated were the percentage and emergency
speed index of plantlets at 24, 34 and 43 days after sowing, the
length of the main root and aerial part, dry weight of root, shoot
and total of plantlets. The mechanical scarification in Biribá
seeds promotes higher percentage and of plantlets emergence
speed index. Increased concentrations of gibberellic acid linearly
increase the percentage and the emergency speed index and the
length of the main root and shoots of plantlets. Allowing more
rapid emergence and consequently saving time in the production
of seedlings, it is recommended scarification of biribá seeds.
Descrição
Palavras-chave
Rollinia mucosa (Jacq.) Baill, Superação de dormência, Regulador de crescimento, Rollinia mucosa (Jacq.) Baill, Growth regulators, Dormancy breaking
Citação
CAMPOS, Luiz Fernandes Cardoso; ABREU, Camila Meira de; GUIMARÃES, Ricardo Neves; SELEGUINI, Alexsander. Escarificação e ácido giberélico na emergência e crescimento de plântulas de biriba. Ciência Rural, Santa Maria, v. 45, n. 10, p. 1748-1754, out. 2015.