Phenolic Substances and Their Possible Role in Plant Growth Regulation

Kefeli, V. I.; Kutáček, M.

doi:10.1007/978-3-642-66589-9_20

Cited by 56 publications

(29 citation statements)

References 4 publications

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“…Increasing concentrations of yellow-colored quercetin derivates significantly inhibited the growth of young pea plants [31] as well as the proliferation of human cancer cells [32]. When in August 2015 needle growth declined, the mesophyll flavanols started to diminish, and then the accelerated ageing of the cells together with yellow flavonoids became more apparent.…”

Section: Flavanoid Deposition In Severely Stressed Needlesmentioning

confidence: 99%

Acclimation Changes of Flavonoids in Needles of Conifers during Heat and Drought Stress 2015

Feucht

Schmid

Treutter

2016

Climate

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Abstract:The long-term harsh climate conditions in 2015 distorted already from June up to November in all study trees of Tsuga and Taxus the intracellular organization of the needles. Intimately involved in these repressive processes were the flavanols, a small subgroup of the flavonoids. They were not only deposited in vacuoles of conifer needles but also in the nuclei and chromosomes. Among the many flavonoids the small group of catechin derivatives and polymers named flavanols can exclusively be stained blue with DMACA (dimethylaminocinnamaldehyde). From mid-July onward, the vacuolar flavanols of the epidermal cell layers were gradually diminished as evidenced by decreasing blue staining of nuclei and vacuoles. Subsequently, in August also the large spongy mesophyll cells showed the flavanols decreasing progressively. Apparently, the antioxidant flavanols operate as oxygen radical scavengers. (ROS) were used up during the harsh environmental stress conditions. Both, Tsuga and Taxus reacted in this way. However, it is quite surprising that in all study trees the palisade cells did not contain such vacuolar flavanols. Only these cells were in June the first to show a loss of chlorophyll from chloroplasts as well as an efflux of flavanols from the nuclei. Conversely, from September onward another group of phenols, the yellow-staining flavanols were newly formed in the palisade cells and later on also in the mesophyll cells. Obviously, they were assembled finally to stabilize finally the fragile cell sites. Summing up, the present study shows by cytological studies that the climatic conditions in 2015 produced the worst disturbance of subcellular structures observed since 2000 when our studies on nuclear phenols in needles of conifers were initiated.

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Section: Flavanoid Deposition In Severely Stressed Needlesmentioning

confidence: 99%

Acclimation Changes of Flavonoids in Needles of Conifers during Heat and Drought Stress 2015

Feucht

Schmid

Treutter

2016

Climate

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“…Os compostos fenólicos participam da regulação catabólica, agindo sobre a AIA-oxidase, enzima que degrada a auxina. Essa enzima, cuja atividade é controlada pelos fenóis, em particular, pelos monofenóis, que aumentam, enquanto os difenóis, como por exemplo, o ácido clorogênico, diminuem, agindo, assim, como protetores (Nitsch & Nitsch, 1962;Stenlid, 1976;Kefeli & Kutacek, 1977;Poëssel, 1983;Musacchi, 1994).…”

Section: Introductionunclassified

AVALIAÇÃO DA COMPATIBILIDADE DA ENXERTIA EM Prunus sp.

Rodrigues¹,

Machado²,

Diniz

et al. 2001

Rev. Bras. Frutic.

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RESUMO-A atividade de peroxidase e concentração de fenóis foi determinada com o objetivo de se avaliar aspectos de compatibilidade entre porta-enxertos e enxertos. As amostras foram processadas e obtidas a partir da casca e lenho dos porta-enxertos de pessegueiros (GF 677, Okinawa, Capdeboscq e Aldrighi) e de ameixeiras (Mirabolano e Marianna), enxertados ou não com as cultivares Diamante, Eldorado e Santa Rosa. Concluiu-se que a atividade de peroxidase e a concentração de fenóis foram relacionadas com união entre enxerto e porta-enxerto, particularmente, em Marianna e Mirabolano, onde a atividade de peroxidase e a concentração de fenóis foram mais elevados. A cultivar Santa Rosa foi compatível tanto com os porta-enxertos de ameixeiras quanto com os de pessegueiros.Palavras-chave: incompatibilidade da enxertia, peroxidase, fenóis, ameixeira. EVALUATION OF THE GRAFT COMPATIBILITY IN Prunus sp.ABSTRACT -The work was accomplished aiming to quantify the peroxidase activity and total phenols, in order to verify the physiological and biochemical processes in grafting of Prunus sp. cultivars. The samples were processed and obtained in bark and wood of the peach rootstocks (GF 677, Okinawa, Capdeboscq and Aldrighi) and plum rootstocks (Mirabolano and Marianna), after they had or not been grafted with the stock Diamante, Eldorado and Santa Rosa. It could be concluded that the peroxidase and the total phenols activity influenced the union between stock and rootstock; after grafting, the incompatibility degree is related with high peroxidase activity and total phenols in the rootstock Marianna and Mirabolano. The Santa Rosa plum graft is as compatible to plum rootstocks as to the peach ones.Key word: graft incompatibility, peroxidase activity, total phenols, Prunus. INTRODUÇÃOA peroxidase e os fenóis são substâncias de grande importância na união entre o enxerto e o porta-enxerto, podendo influenciar nas respostas do processo de enxertia.A peroxidase (PO) está envolvida em muitas das reações metabólicas e processos fisiológicos dos tecidos vegetais. Essa enzima participa da síntese de lignina que é de fundamental importância no desenvolvimento das plantas frutíferas e na compatibilidade da enxertia (Flurkey e Jen, 1978; Musacchi, 1994).A peroxidase é uma enzima cuja especificidade é atuar sobre os peróxidos, principalmente os de hidrogênio, decompondo-os e liberando oxigênio (Gaspar et al., 1982).Embora se reconheça sua importância no metabolismo das frutíferas, pouco se conhece sobre seu papel no crescimento e desenvolvimento das plantas, nas respostas ao estresse (Lagrimini et al., 1990), bem como seu envolvimento no processo de soldadura do enxerto.Um efeito da ação da peroxidase foi observado na combinação incompatível de Prunus avium com Prunus cerasus, onde o aumento da atividade de peroxidase coincidiu com o escurecimento dos tecidos na região enxertada (Schmid & Feucht, 1984;Schmid & Feucht, 1985;Schmid & Freitag, 1988).Os fenóis participam em grande número de processos metabólicos de plantas, sendo que 60% da prod...

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“…The role of phenolics in the regulation of plant growth has been well established [11]. Two theories have been propounded to explain their mode of action, (i) Involvement in auxin biosynthesis and destruction.…”

Section: Introductionmentioning

confidence: 99%

“…Quinones, which are the oxidised forms of phenols, have often been shown to enhance the inhibitory effect of phenols [11 ]. This can be in terms of an alteration in the cellular redox potentials, reactions with aminoacids and proteins, interference with co-factors and enzyme synthesis, and the inhibition of specific enzyme systems [15].…”

Section: Introductionmentioning

confidence: 99%

Quinones as plant growth regulators

Ranade¹,

David²

1985

Plant Growth Regul

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The effects of benzoquinone, naphthaquinone and anthraquinone on the growth of tomato callus, whole plants of tomato and on rooting of mungbean cuttings were studied. Naphthaquinone effects on some oxidases and on the isozyme patterns of peroxidases in all the three systems were also observed. Quinones increased callus growth, the number of roots initiated in mungbean cuttings and the growth of tomato plants, significant increases being obtained with 10-s M naphthaquinone. Naththaquinone also decreased the activities of IAA oxidase, ascorbic acid oxidase and polyphenol oxidase, and led to the disappearance of one of the isozyme of peroxidase in all systems.

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Phenolic Substances and Their Possible Role in Plant Growth Regulation

Cited by 56 publications

References 4 publications

Acclimation Changes of Flavonoids in Needles of Conifers during Heat and Drought Stress 2015

Acclimation Changes of Flavonoids in Needles of Conifers during Heat and Drought Stress 2015

AVALIAÇÃO DA COMPATIBILIDADE DA ENXERTIA EM Prunus sp.

Quinones as plant growth regulators

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