Leaf Blackening in Cut Protea Eximia: Importance of Water Relations

Paull, R.E.; Goo, Theodore; Criley, Richard A.; Parvin, Philip E.

doi:10.17660/actahortic.1981.113.22

Cited by 8 publications

(9 citation statements)

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“…O escurecimento pode estar relacionado ao estresse hídrico (Swardt, 1977;Paull, 1981), ou à baixa concentração de carboidratos (Reid, 2002) e à curvatura de hastes provavelmente ocorre devido à presença de bactérias que ocasionam o bloqueio dos vasos do xilema e dificultam o fluxo de água (Witte & Doorn, 1988).…”

Section: Resultsunclassified

Influência do 1-MCP na conservação pós-colheita de rosas cv. Vega

Pietro

Mattiuz

2010

Ciênc. agrotec.

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RESUMOObjetivou-se, neste trabalho, estudar aspectos da fisiologia pós-colheita de rosas cortadas cv. Vega, tratadas com diferentes concentrações de 1-metilcicloropropeno (1-MCP). O experimento foi conduzido em delineamento inteiramente casualizado, em esquema fatorial composto por dois fatores: quatro tratamentos pós-colheita e quatro datas de avaliação (0; 4; 8; 12 dias). As flores foram submetidas aos seguintes tratamentos: 1) Água destilada (controle); 2) 1-MCP (100 ppb); 3) 1-MCP (250 ppb); 4) 1-MCP (500 ppb). Foram realizadas as seguintes avaliações: massa fresca, cor, turgescência, curvatura, taxa respiratória, conteúdo relativo de água, conteúdo de carboidratos solúveis, de redutores e de antocianina. Ao contrário do tratamento controle, todas as concentrações de 1-MCP foram eficientes para retardar a senescência das flores, porém, a concentração de 1-MCP a 500 ppb destacou-se pela melhor manutenção da qualidade, além de prolongar a vida decorativa das hastes até 19 dias. Termos para indexação:Rosa sp, flor de corte, inibidor de etileno. ABSTRACTThe objective of this work was to study aspects of postharvest physiology of cut roses cv. Vega, treated with different concentrations of 1-metilcloropropene (1-MCP). The experiment was conducted in a complete randomized design composed of two factors: four postharvest treatments and four dates of evaluation (0; 4; 8; 12 days). The following treatments were used: 1) distilled water; 2) 1-metilciclopropeno (1-MCP) 100 ppb; 3) 1-MCP 250 ppb; 4) 1-MCP 500 ppb. The following evaluations were made: fresh weight, color, turgor, curvature, respiration rate, relative water content, content of soluble carbohydrates, reducing and anthocyanin. Unlike treatment with distilled water, all concentrations of 1-MCP were effective in delaying the senescence of flowers; however, the concentration of 1-MCP at 500 ppb was highlighted by better maintenance of quality and extended decorate life stem up to 19 days.

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Section: Resultsunclassified

Influência do 1-MCP na conservação pós-colheita de rosas cv. Vega

Pietro

Mattiuz

2010

Ciênc. agrotec.

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“…Within a few days of harvest, the leaves become limp and leathery; a day or two later black areas develop, so that within 8 days of harvest most leaves can be completely black. The direct cause is a polymerization and oxidation of the abundant hydroxyphenols and tannins, occurring when cell compartmentation breaks down (Paull et al, 1980;Whitehead and de Swardt, 1982).…”

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Carbohydrate Changes and Leaf Blackening in Cut Flower Stems of Protea eximia

Bieleski¹,

Ripperda²,

Newman³

et al. 1992

jashs

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We tested the hypothesis that premature leaf blackening in cut flower stems of Protea eximia (Salisb. ex Knight) Fourcade may be brought about by a low leaf carbohydrate status. Leaves on cut flower stems held in darkness blackened within 4 days, whereas those on stems held in a greenhouse remained healthy for 5 days. Leaf blackening was also retarded by supplying 1% sucrose in the vase solution; but other additives (hypochlorite, silver thiosulfate, bisulfite) were not effective. The hypothesis was further explored by examining postharvest carbohydrate changes in the leaf of cut flower stems held in light or darkness. At harvest, leaves contained very little hexose (< 1 mg·g-1 fresh weight), comparatively small concentrations of sucrose (≈ 5 mg·g-1 fresh weight) and starch (≈ 6 mg·g-1fresh weight), but high concentrations (≈ 30 mg·g-1fresh weight) of the polyol polygalatol. Starch and sugar contents of leaves held in darkness fell rapidly, to one-third of their initial level after only 1 day and to one-sixth after 3 days. In contrast, starch and sugar contents increased slowly in leaves of stems held in light to three times the initial level after 3 days. Polygalatol content was unaffected by any treatment. Removal of the inflorescence did not delay blackening of leaves held in darkness and did not affect their carbohydrate changes.

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“…Many Proteaceous species have become important "cut-flower crops. A major postharvest problem of this genus, in particular Protea neriifolia and P. eximia, is premature blackening of the leaves (Brink and de Swardt, 1986;Ferreira, 1983;Newman et al, 1989;Paull et al, 1980). Leaves of susceptible species begin to turn black within 3 to 7 days after harvest, severely reducing the market value of a flower stem that otherwise has a potential vase life of 3 to 4 weeks.…”

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confidence: 99%

“…However, leaf blackening is known to decrease significantly when the influence of the inflorescence sink is eliminated by girdling the stem immediately below the inflorescence or by removing it (Newman et al, 1989;Paull et al, 1980). Blackening is also reduced by lighted postharvest conditions (Newman et al, 1989) and the addition of external sugar to the vase solution at concentrations ranging from 0.5% to 1.0% (Brink and de Swardt, 1986;Ferreira, 1986;Newman et al, 1989).…”

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Carbohydrate Depletion and Leaf Blackening in Protea neriljiolia

McConchie¹,

Lang²,

Gross³

1991

jashs

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Leaf blackening on cut flower Protea nerii[olia R. Br. stems was dramatically reduced under a 12-hour photosynthetic light period (120 μmol·m-2·s-1) at 25C for 15 days compared with stems kept in the dark. In the light, addition of 0.5% exogenous sugar to the vase solution resulted in a maximum of 2.5% leaf blackening, while stems with no exogenous sugar had a maximum of 16.5%. Continuous darkness resulted in 94% leaf blackening by day 7, irrespective of sugar treatment. Starch and sucrose concentrations were markedly lower in leaves on dark-held stems than in leaves on stems held in the light; thus, carbohydrate depletion could be the primary stress that initiates leaf blackening. In the light, rates of carbon exchange and assimilate export were similar, indicating that the amount of carbon fixed maybe regulated by sink demand. The pattern of carbon partitioning changed in light-held leaves of the 0% sugar treatment during rapid floral expansion and senescence. Inflorescence expansion appears to influence partitioning of photoassimilates and storage reserves into transport carbohydrates; under decreased sink demand, the assimilate export rate decreases and photoassimilates are partitioned into starch. The data suggest that sink strength of inflorescences held in darkness may be responsible for the depletion of leaf carbohydrates and. consequently, blackening.

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Leaf Blackening in Cut Protea Eximia: Importance of Water Relations

Cited by 8 publications

References 0 publications

Influência do 1-MCP na conservação pós-colheita de rosas cv. Vega

Influência do 1-MCP na conservação pós-colheita de rosas cv. Vega

Carbohydrate Changes and Leaf Blackening in Cut Flower Stems of Protea eximia

Carbohydrate Depletion and Leaf Blackening in Protea neriljiolia

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