Does Ethylene Play a Role in the Release of Lateral Buds (Tillers) from Apical Dominance in Oats?

Harrison, M. D.; Kaufman, Peter B.

doi:10.1104/pp.70.3.811

Cited by 41 publications

(18 citation statements)

References 17 publications

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“…It was found that exogenous application of kinetin stimulates axillary bud growth in wheat (Langer et al 1973). Harrison and Kaufman (1982) reported that exogenous application of ethylene or auxin inhibits kinetin induced tiller bud swelling and elongation in oats. In a recent review, it is stated that buds at different locations of the main shoot exhibit different responses to auxins, cytokinin and an unknown graft transmissible signal involved in branching inhibition (Dun et al 2006), but the homeostatic control, which works as checkpoint for feedback regulation of tiller number, is not studied.…”

Section: Introductionmentioning

confidence: 98%

Hormonal regulation of tiller dynamics in differentially-tillering rice cultivars

Kariali

Mohapatra

2007

Plant Growth Regul

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Tiller number can contribute significantly to yield potential of rice, but little knowledge is available on hormonal regulation of tillering and tiller dynamics. In the present study, Indole-3-acetic acid (IAA), kinetin (6-furfuryl amino purine) and Gibberellic acid (GA 3 ) treatments have been applied at the early tillering stage to two rice cultivars that contrast for tiller number. The responses of the hormones were studied on growth, development, grain yield, senescence patterns, assimilate concentration of the panicle and ethylene production in different classes of tillers. The leaf area, panicle grain number, fertility percentage and grain yield of tillers were higher in the low-tillering cultivar than that of high-tillering cultivar; the treatment of kinetin was more effective in the latter than in the former. High ethylene production was responsible for reduction of growth duration and grain yield of the tillers. Kinetin application reduced ethylene production of the latetillers significantly for the benefit of grain yield.

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Section: Introductionmentioning

confidence: 98%

Hormonal regulation of tiller dynamics in differentially-tillering rice cultivars

Kariali

Mohapatra

2007

Plant Growth Regul

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“…However, we worked with the whole stolon to minimize disturbance of the tissue. A latent period in ethylene production also was found in studies with other plant parts or plants either in horizontal orientation (2, 9,20) or in inverted orientation (13,15,16).…”

Section: Discussionmentioning

confidence: 64%

Role of Ethylene in the Geotropic Response of Bermudagrass (Cynodon dactylon L. Pers.) Stolons

Balatti

Willemoës²

1989

Plant Physiol.

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We studied the relationship between ethylene and gravityinduced upward bending of bermudagrass (Cynodon dactylon L. Pers.) stolons. Ethylene production begins within 3 hours of the onset of gravistimulation, and increases thereafter until the 15th hour, after which it declines. There is a close positive relationship between ethylene production and upward bending during the first 12 hours of gravistimulation. Incubation of stolons with AgNO3 did not prevent ethylene evolution but delayed upward bending. In addition, ethylene production was 10-fold greater and peaked earlier in gravistimulated nodes incubated with 1-aminocyclopropane 1-carboxylic acid. The gravitational stimulation could be due to an increase in both 1-aminocyclopropane 1-carboxylic acid synthase and the ethylene forming enzyme. The results suggest that ethylene promotes the activity of indoleacetic acid.Bermudagrass (Cynodon dactylon L. Pers.) stolons normally grow horizontally when attached to the plant. However, their excision results in the reorientation of apical tissue growth from horizontal to vertical (12). Since the work of Neljubow on pea (discussed by Abeles [1]), it has been known that ethylene can alter the orientation ofstem growth from vertical to horizontal in pea and cotton (7) and conversely, from horizontal to vertical in strawberry clover (8) for 12 h in a vertical position to eliminate the effects ofwound ethylene (unpublished personal observations) and then were arranged horizontally on a framework, which consisted of a wooden base, above which two vertical wooden frames were tightly mounted. Sixteen holes were drilled into each frame, so that each flask could be placed horizontally and fit tightly. Curvature measurements of 32 stolons were made from photographs taken manually every 3 h during a 23 h time period.To minimize biological variability between stolons, values are given as the percentage of curvature with respect to the final curvature of each stolon: final curvature percentage (FCP) = observed curvature/final curvature X 100. This normalization allowed us to determine when differences in the rate of bending were significantly different. Ethylene MeasurementsGroups of 25 apical nodal segments of bermudagrass stolons were weighed, and then arranged in 7-mL, gas-tight vials containing washed vermiculite to provide moisture and support them in the proper orientation. Only the apical node of each stolon, including 5 mm of surrounding tissue, was used. The vials were kept upright and unsealed in humidified plastic boxes for 12 h at 20°C in the dark to allow dissipation of wound ethylene. Vials then were placed horizontally according to the treatment and subjected to gravistimulation for time periods of 3, 7,11,15,19, and 23 h. The flasks were sealed 3 h before assay for ethylene. All experiments were performed in darkness and at a room temperature of 28°C.A l-mL gas sample was withdrawn from each flask, and ethylene was assayed with a gas chromatograph equipped with a stainless steel column filled with Chromosor...

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“…Essa hipótese estaria de acordo com duas das três sugestões propostas por Yamamoto et al (1995) para explicar o desenvolvimento dos ramos laterais. Nesse caso, o etileno pode ter agido como um hormônio modulador na promoção do alongamento dos ramos na presença de citocinina, como foi observado por Harrison & Kaufman (1982). Evidentemente, maiores estudos para comprovar essa hipótese são necessários, como as quantificações de teores de auxina e citocininas nas gemas laterais da base do caule, após a aplicação de Ethrel.…”

Section: Discussionunclassified

Efeito de alagamento e de aplicação de fitorreguladores na brotação de Guazuma ulmifolia (Malvaceae) e de Sesbania virgata (Fabaceae)

Cortezi¹,

Colli²

2011

Rev. bras. Bot.

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-(Effect of flooding and application of plant growth regulators on sprouting of Guazuma ulmifolia (Malvaceae) and Sesbania virgata (Fabaceae)). Plants of Guazuma ulmifolia Lam. (4 month-old) and Sesbania virgata (Cav.) Pers. (2 month-old) were submitted to flooding in order to assess sprouting and elongation of the stem of these species, and to examine the effect of ethylene and kinetin in theses processes. The plants were submitted to flooding or maintained in dry soil for a period of 100 days and also together with: Ethrel, Ethrel with 6-BA, 6-BA or silver nitrate. Plants of G. ulmifolia sprouted after a short period of flooding, and the application of Ethrel and of Ethrel and 6-BA, in addition to the conditions of flooding, prompted the emergence of a greater number of branches than the other treatments. The application of silver nitrate, in flooded plants of G. ulmifolia, inhibited the development of lateral branches. In S. virgata, plants that received the application of 6-BA, on substrate drained or flooded, had a larger number of branches than the other treatments. Plants of G. ulmifolia and S. virgata showed a decrease in stem elongation as lateral branches were formed. The two species showed different tolerance mechanisms that contributed to their survival under conditions of prolonged flooding.Key words -6-BA, branching, ethylene, hypoxia RESUMO -(Efeito de alagamento e de aplicação de fitorreguladores na brotação de Guazuma ulmifolia (Malvaceae) e de Sesbania virgata (Fabaceae)). Plantas de Guazuma ulmifolia Lam. e Sesbania virgata (Cav.) Pers. com quatro e dois meses, respectivamente, foram submetidas ao alagamento com o objetivo de avaliar a brotação e o alongamento do caule destas duas espécies, e analisar o efeito do etileno e da citocinina nesses processos. Para isso, as plantas foram submetidas ao solo alagado ou mantidas em solo drenado por um período de 100 dias e também acrescido, em ambos os casos, de: Ethrel, Ethrel com 6-BA, 6-BA ou nitrato de prata. As plantas de G. ulmifolia apresentaram brotação após curto período de alagamento, e a aplicação de Ethrel e de Ethrel e 6-BA, somada às condições de alagamento, estimulou o surgimento de um maior número de ramos do que nos demais tratamentos. A aplicação de nitrato de prata, em plantas alagadas de G. ulmifolia, inibiu o desenvolvimento de ramos laterais. Em S. virgata, as plantas que receberam a aplicação de 6-BA, em substrato drenado ou alagado, apresentaram maior número de ramos do que nos demais tratamentos. Tanto as plantas de G. ulmifolia como as de S. virgata apresentaram diminuição no alongamento do caule à medida que ramos laterais foram formados. As duas espécies estudadas apresentaram diferentes mecanismos de tolerância que contribuíram para sua sobrevivência em condições de alagamento prolongado.Palavras-chave -6-BA, etileno, hipoxia, ramificação

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Does Ethylene Play a Role in the Release of Lateral Buds (Tillers) from Apical Dominance in Oats?

Abstract: MATERIALS AND METHODSThe growth of lateral buds (tillers), which are undergoing release from apical dominance, was measured in upright and gravistimulated intact

Cited by 41 publications

References 17 publications

Hormonal regulation of tiller dynamics in differentially-tillering rice cultivars

Hormonal regulation of tiller dynamics in differentially-tillering rice cultivars

Role of Ethylene in the Geotropic Response of Bermudagrass (Cynodon dactylon L. Pers.) Stolons

Efeito de alagamento e de aplicação de fitorreguladores na brotação de Guazuma ulmifolia (Malvaceae) e de Sesbania virgata (Fabaceae)

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