Weeds Interference in Pequi Plants

Pequi plants are native fruit species of the Cerrado and is at risk of extinction due to the destruction of native vegetation and the extraction of their fruits. Because this species has a long juvenile period, it becomes susceptible to the interference of weeds, mainly forage grass. This research a...

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Bibliographic Details
Published in:Advances in Weed Science 2018-01, Vol.36
Main Authors: MARTINS, D.A., JAKELAITIS, A., COSTA, A.C., ALMEIDA, G.M.A., SILVA FILHO, R.O.
Format: Article
Language:English
Subjects:
Biodiversity
Caryocar brasiliense
Chlorophyll
Coexistence
Conductance
Dry matter
Ecosystems
Fruits
Grasses
Humidity
Indigenous species
Interference
Leaf area
Leaves
Melinis minutiflora
Paspalum
Paspalum notatum
Photochemicals
Photosynthesis
PLANT SCIENCES
Resistance
Seedlings
Species extinction
Stomata
Stomatal conductance
Transpiration
Urochloa
Urochloa decumbens
Weeds
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Summary:Pequi plants are native fruit species of the Cerrado and is at risk of extinction due to the destruction of native vegetation and the extraction of their fruits. Because this species has a long juvenile period, it becomes susceptible to the interference of weeds, mainly forage grass. This research aimed to evaluate the effects of forage grass species coexisting with small seedlings. The treatments, arranged in a factorial scheme, consisted of three weed species(Melinis minutiflora, Paspalum notatumandUrochloa decumbens)coexisting in four densities (1, 2, 3, and 4 plants per pot) with pequi plants. As an additional treatment a pequi plant was cultivated free of coexistence. The physiological variables photosynthetic rate (A), stomatal conductance (gs), transpiration rate (E) Ci/Ca relation, the effective quantum yield of PS II, transport rate of electrons and non-photochemical quenching, and growth variables: height (PH), Leaf area (LA) and dry matter (DM) were affected by weed coexistence.U. decumbenspromoted greater intensity interference with pequi plants. The degree of interference was greater with increasing density of weeds, with linear decreasing behavior for the variables A, gs, E, PH, LA, MD, stem diameter and number of leaves of pequi plants. RESUMO: O pequizeiro, espécie frutífera nativa do cerrado, encontra-se em risco de extinção devido à destruição de vegetações nativas e pelo extrativismo de seus frutos. Por ser uma espécie de período juvenil longo, torna-se sensível à interferência imposta por plantas daninhas, principalmente gramíneas forrageiras. Nesta pesquisa, objetivou-se avaliar os efeitos da interferência causada por gramíneas forrageiras convivendo com plantas de pequi. Os tratamentos, arranjados em esquema fatorial, constituíram-se de três espécies de plantas daninhas (Melinis minutiflora, Paspalum notatum e Urochloa decumbens) convivendo em quatro densidades (1, 2, 3 e 4 plantas por vaso) com as mudas de pequizeiro. Como tratamento adicional, foi cultivada uma planta de pequi livre de convivência. As variáveis fisiológicas taxa fotossintética (A), condutância estomática (gs), taxa transpiratória (E), relação Ci/Ca, rendimento quântico efetivo do FS II, taxa de transporte de elétrons e quenching não fotoquímico e as variáveis de crescimento altura (AP), área foliar (AF) e massa seca (MS) foram afetadas pela convivência das plantas daninhas, após 75 dias de convivência. U. decumbens promoveu maior intensidade de interferência com pla
ISSN:0100-8358
1806-9681
1806-9681
2675-9462
DOI:10.1590/s0100-83582018360100004