Growth Responses of Tomato Plants in Non-aerated Water Culture to Foliar Sprays of Gibberellic Acid and Benzyladenine

Selman, I. W.; Sandanam, S.

doi:10.1093/oxfordjournals.aob.a084639

Cited by 28 publications

(8 citation statements)

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“…6). Shoot ethylene production/plant increased significantly within 24 hr of depriving the root of 02, and continued to rise on the 2nd day before declining on the 3rd. Unlike the previous experiment, ethylene production by control plants also increased during this period.…”

Section: Resultsmentioning

confidence: 95%

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Effects of Root Anaerobiosis on Ethylene Production, Epinasty, and Growth of Tomato Plants

Bradford

Dilley²

1978

Plant Physiol.

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Experiments were performed to determine the source(s) of ethylenecausing epinasty in flooded tomato plats (Lyc_perskoa escultm MilL). Simultaneous measurements were made of ethylene synthesized by the roots and shoots of tomato plants exposed to This study tested these hypotheses by using N2 ventilation of the root zone, rather than flood water, to impose an 02 deficiency upon the root without blocking gas diffusion. Microbial contribution of ethylene was prevented by using inert growing media. A special apparatus maintained the desired atmosphere in the root zone and allowed simultaneous measurement of root and shoot ethylene synthesis.

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Section: Resultsmentioning

confidence: 95%

“…However, application of cytokinins, gibberellins, or mixture of the two hormones can only partially relieve flooding injury (10,18,19,24). Reduced supply to the shoot of rootsynthesized hormones may be involved in flooding injury, but is probably not the only contributing factor.…”

Section: Resultsmentioning

confidence: 99%

Effects of Root Anaerobiosis on Ethylene Production, Epinasty, and Growth of Tomato Plants

Bradford

Dilley²

1978

Plant Physiol.

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“…Flooding of sunflower results in a reduction of endogenous cytokinins (Burrows and Carr 1969) and foliar application of benzyladenine (BA), a synthetic cytokinin, to flooded tomato plants overcomes most of the injurious effects of flooding (Selman andSandanam 1972, Railton andPhysiol. Plant.…”

Section: Introductionmentioning

confidence: 99%

The Role of Endogenous Auxins and Ethylene in the Formation of Adventitious Roots and Hypocotyl Hypertrophy in Flooded Sunflower Plants (Helianthus annuus)

Wample

Reid

1979

Physiologia Plantarum

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The role of ethylene and auxins in flood-induced adventitious root formation and hypocotyl hypertrophy in sunflower {Helianthus annuus L. cv. Russian) plants was studied. Flooding without aeration (F) resulted in a steady increase in ethylene in hypocotyls, and flooding with aeration (FA) caused a transient increase. Low light intensity increased ethylene levels but decreased adventitious root formation. Treatment of shoots with benzyladenine (BA) increased ethylene content in non-flooded (NF) but not in F or FA shoots.Twenty-four hours of flooding brought about a rise of endogenous indole-acetic acid (IAA) in hypocotyls. ^''C-IAA applied to the shoot accumulated more in F and FA hypocotyls than in NF hypocotyls, and BA reduced this accumulation. There was less IAA metabolism in F and FA than in NF hypocotyls.Tri-iodo benzoic acid (TIBA) applied to the hypocotyls of F plants inhibited root production. Benzyladenine (BA) applied to the leaves had similar effect but was not effective when supplied to the shoot apex. BA did not inhibit flood-induced hypocotyl hypertrophy. Ethrel did not affect adventitious root formation in NF plants but did increase hypocotyl thickening.It is concluded that flood-induced adventitious root formation is stimulated primarily by an accumulation of auxins in the hypocotyls. Increases in ethylene might cause this auxin build up. Hypocotyl hypertrophy is presently thought to be the result of an interaction of auxin and ethylene with ethylene being the major factor.

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“…como já observado em outros estudos com plantas em condições de hipoxia (Selman & Sandana 1972;Neuman & Smit 1991;Zhang & Zhang 1994). Em C. pachystachya as porcentagens de reduções na condutância estomática nos diferentes períodos de alagamento (47% em dois, 53% em cinco e 70% em 15 dias) foram semelhantes àquelas apresentadas pela taxa fotossintética (47% em dois, 46% em cinco e 75% em 15 dias).…”

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Tolerância à inundação de Cecropia pachystachya Trec. (Cecropiaceae): aspectos ecofisiológicos e morfoanatômicos

et al. 2008

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RESUMO -(Tolerância à inundação de Cecropia pachystachya Trec. (Cecropiaceae): aspectos ecofisiológicos e morfoanatômicos).Visando elucidar aspectos da tolerância à hipoxia, plantas de Cecropia pachystachya foram submetidas a 30 dias de inundação. O crescimento e desenvolvimento, a condutância estomática, a fotossíntese e a morfo-anatomia foram avaliadas. A taxa de crescimento relativo (TCR) da raiz e do caule foi inferior em plantas alagadas, não havendo diferenças nesta taxa para as folhas e para a planta inteira. A não variação na TCR das folhas pode ter sido em função da maior esclerofilia foliar das plantas alagadas, que apresentaram menor área. A condutância estomática e a taxa fotossintética diminuíram nas plantas submetidas ao alagamento. Foram observadas alterações morfoanatômicas em caules e principalmente em raízes de plantas alagadas. A análise dos resultados indica que a tolerância desta espécie a períodos de inundação está relacionada à sua capacidade de manter uma satisfatória produção energética. A manutenção de um balanço energético positivo possibilita que mesmo sob estresse, com queda na taxa fotossintética, as plantas desta espécie apresentem uma considerável TCR. Portanto, C. pachystachya pode ser forte competidora em áreas sujeitas ao alagamento. Palavras-chave: alagamento, anatomia ecológica, Cecropia pachystachya, fotossíntese, TCRABSTRACT -(Flood tolerance in Cecropia pachystachya Trec. (Cecropiaceae): ecophysiological and morpho-anatomical aspects). To elucidate certain aspects of hypoxia tolerance in Cecropia pachystachya, plants were submitted to 30 days of flooding. Growth and development, stomatal conductance, photosynthetic rates and morpho-anatomy were studied. Root and stem relative growth rates (RGR) were lower in flooded plants. There was no difference in leaf RGR and whole plant RGR. The maintenance of leaf RGR is possibly related to greater sclerophylly in flooded plants. Stomatal conductance and photosynthetic rate decreased due to flooding. Stems and roots, especially the latter, showed morpho-anatomical alterations in flooded plants. The results so far suggest that flood tolerance in C. pachystachya is related to the capacity to maintain satisfactory energy production. The maintenance of a positive energy balance allows this species to maintain a substantial RGR, even under stress with a lower photosynthetic rate. Therefore C. pachystachya may be a strong competitor in flooded areas.

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Growth Responses of Tomato Plants in Non-aerated Water Culture to Foliar Sprays of Gibberellic Acid and Benzyladenine

Cited by 28 publications

References 5 publications

Effects of Root Anaerobiosis on Ethylene Production, Epinasty, and Growth of Tomato Plants

Effects of Root Anaerobiosis on Ethylene Production, Epinasty, and Growth of Tomato Plants

The Role of Endogenous Auxins and Ethylene in the Formation of Adventitious Roots and Hypocotyl Hypertrophy in Flooded Sunflower Plants (Helianthus annuus)

Tolerância à inundação de Cecropia pachystachya Trec. (Cecropiaceae): aspectos ecofisiológicos e morfoanatômicos

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