Desenvolvimento inicial de plântulas de Theobroma grandiflorum (Willd. ex Spreng.) Schum. sob influência de sombreamento

Silva, Rubens Ribeiro da; Freitas, Gilson Araújo de; Siebeneichler, Susana Cristine; Mata, Jhansley Ferreira da; Chagas, Jaíza Ribeiro

doi:10.1590/s0044-59672007000300007

Cited by 28 publications

(39 citation statements)

References 4 publications

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“…For interaction between varieties and environments, the height was higher in RRIM 600 variety grown in screen house environments with Sombrite® and Aluminet® (Table 4) and ARAÚJO & DANTAS (2014) "pinhão-manso" seedlings (Jatropha curcas L.) on different shadings verified that the lowest average height were found in plants subjected to full sun conditions, as well as SILVA et al (2013) for coffee (Coffee arábica).…”

Section: Environmentssupporting

confidence: 52%

“…which caused lower growth of the rootstock and higher costs on plant protection products. SILVA et al (2013) reported that it is not advisable the production of coffee seedlings in full sun, regardless of the type of substrate used, as it was seen the worst seedlings compared to those produced in screen house.…”

Section: Resultsmentioning

confidence: 99%

“…Usually in the traditional farming system (full sun), the plants show symptoms of nutritional deficiency, due to the leaching of substrates by the rains, affecting directly the accumulation of dry matter (BIRRENKOTT et al, 2005;GODOY & COLE 2000 ). SILVA et al (2007) testing the influence of different levels of shading on "cupuaçu" seedlings (Theobroma grandiflorum), found higher total dry matter increment (TDM) than those who remained exposed in 50% shading environment, presenting difference from those grown at 0% and 90%. It was found that the efficiency in the use of light incidence generated higher production of photo-assimilates and consequently higher TDM of the plant, similar to this study.…”

Section: Interaction (C X E)mentioning

confidence: 99%

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Clones, substrates and environments for seedlings of rubber tree rootstocks

et al. 2016

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ABSTRACT:The objective of this study was to evaluate the growth of rubber clones GT1, PR255, RRIM600 grown on different substrates and environments for the production of rubber rootstocks. The experiment was conducted at the Universidade Estadual de Mato Grosso do Sul, Cassilândia University Unit, in Cassilândia-MS. The treatments were conducted in 3 environments: (A1): Sombrite ® ; (A2) Aluminet ® and (A3) full sun, where the clones being tested were: GT1; PR 255 and RRIM 600, grown in substrates: pure soil; soil + cattle manure and commercial substrate usually used for forestry. The experimental design was a randomized block in a factorial 3 x 3 (three substrates x three clones), with 4 replicates with 10 seedlings of rubber trees per plot. The use of commercial substrate and soil + cattle manure in the ratio (7:1) favored the development of rubber rootstock seedlings with taller plants, more leave number, higher mass and higher quality index. For the formation of rootstocks, the variety RRIM600 was the one that showed better agronomic characteristics in the formation of rubber tree seedlings, with higher number of leaves, tallest plants, larger mass and higher quality index. The use of Sombrite ® and Aluminet ® screens contributed positively to the formation of rootstocks with larger root and above-ground masses. The plants produced in the Aluminet ® screen showed higher number of leaves.

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Section: Environmentssupporting

confidence: 52%

Section: Resultsmentioning

confidence: 99%

Section: Interaction (C X E)mentioning

confidence: 99%

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Clones, substrates and environments for seedlings of rubber tree rootstocks

et al. 2016

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“…Atualmente, registram-se muitos trabalhos sobre a infl uência do sombreamento no crescimento inicial de espécies de fl orestas úmidas, ou seja, ambientes com evidentes gradientes de sombra (Uchida & Campos 2000;Nakazono et al 2001;Campos & Uchida 2002;Duz et al 2004;Silva et al 2007;Souza et al 2009). Entretanto, nota-se um escasso interesse científi co no conhecimento da infl uência do sombreamento sobre as espécies de fitofisionomias predominantemente abertas e alta incidência solar, como a vegetação da Caatinga.…”

Section: Introductionunclassified

Crescimento inicial de Piptadenia stipulacea (Benth.) Ducke (Mimosaceae) e Anadenanthera colubrina (Vell.) Brenan var. cebil (Griseb.) Altshul (Mimosaceae) sob diferentes níveis de sombreamento

et al. 2012

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Crescimento inicial de Piptadenia stipulacea (Benth.) Ducke (Mimosaceae) e Anadenanthera colubrina (Vell.) Brenan var. cebil (Griseb.) Altshul (Mimosaceae) sob diferentes níveis de sombreamento RESUMO (Crescimento inicial de Piptadenia stipulacea (Benth.) Ducke e Anadenanthera colubrina (Vell.) Brenan var. cebil (Griseb.) Altshul (Fabaceae) sob diferentes níveis de sombreamento). Este trabalho teve como objetivo verifi car como as características morfofi siológicas diferem entre duas espécies da Caatinga com diferentes necessidades de luz para o crescimento inicial, apresentando a hipótese de que P. stipulacea caracteriza-se como espécie heliófi la e A. colubrina como umbrófi la, nas primeiras fases de vida. Conduziu-se um experimento em blocos ao acaso, no qual plântulas de ambas as espécies foram submetidas aos tratamentos de pleno sol, 50%, 70% e 90% de sombra durante seis meses. Foram avaliados aspectos morfológicos (altura, diâmetro, número de folhas e alocação de biomassa) e fi siológicos (teores de clorofi la a, b e total, e razão clorofi la a/b). Os resultados mostraram que as espécies apresentam diferentes exigências de luz durante o crescimento inicial. Plântulas de P. stipulacea apresentaram maior taxa de crescimento relativo e maior diâmetro a pleno sol, menor razão raiz/parte aérea e menor conteúdo de clorofi la total quando comparadas às plântulas de A. colubrina. Os melhores resultados de P. stipulacea a pleno sol e A. colubrina em níveis intermediários de sombra corroboraram com a hipótese deste trabalho e são consistentes com a área de ocorrência de cada espécie. Palavras ABSTRACT(Early growth of Piptadenia stipulacea (Benth.) Ducke and Anadenanthera colubrina (Vell.) Brenan var. cebil (Griseb.) Altshul (Fabaceae) exposed to diff erent levels of shade). Th is study aimed to verify how morpho-physiological characteristics diff er between species of the Caatinga with diff erent light requirements for initial growth, and had the hypothesis that P. stipulacea is light-demanding and A. colubrina is shade-tolerant in the early stages of life. We conducted a randomized block experiment in which seedlings of both species were subjected to treatments of full sun, 50%, 70% and 90% shade for six months. We evaluated morphological (height, diameter, number of leaves and biomass allocation) and physiological (a, b and total chlorophyll content, and ratio of chlorophyll a/b) features. Th e results showed that these species have diff erent light requirements during early growth. Seedlings of P. stipulacea showed a higher relative growth rate and larger diameter when growing in full sun, and a lower root/shoot ratio and lower total chlorophyll content when compared to seedlings of A. colubrina. Th e best results were for P. stipulacea in full sun and A. colubrina at intermediate levels of shade, which corroborate the hypothesis of this work and are consistent with where each species grows.

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“…Apesar da maior altura média ter sido registrada sob 90% de sombreamento, as plântulas de Magonia pubescens apresentaram menor diâmetro nessas condições. Assim, plantas submetidas a 90% de sombreamento podem estar sendo afetadas pelo efeito do estiolamento e menor capacidade em converter energia luminosa em biomassa (SILVA et al, 2007). Por outro lado, tal como observado pelos referidos autores, maiores diâmetros nos sombreamentos entre pleno sol e 70% podem estar relacionados com maior potencial fotossintético das plântulas para realizar os processos metabóli-cos e promover maior crescimento em diâmetro.…”

Section: Desenvolvimento Inicialunclassified