Auxin-Gibberellin Interaction in Rice Coleoptile Elongation

Kefford, N. P.

doi:10.1104/pp.37.3.380

Cited by 45 publications

(20 citation statements)

References 10 publications

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“…Working with rice seedlings, Ku et al . [38] showed that coleoptiles and leaf sheaths elongate when exposed to ethylene and proposed that the reported high growth increments of submerged rice seedlings reported by others [65,37] might result from the accumulation of ethylene within the tissue . They also noted that the addition of CO 2 (0 .5% and above) enhanced the response .…”

Section: Hormonal Control Of Elongation Growthmentioning

confidence: 99%

Ethylene and plants of aquatic and semi-aquatic environments: A review

Osborne¹

1984

Plant Growth Regul

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Section: Hormonal Control Of Elongation Growthmentioning

confidence: 99%

Ethylene and plants of aquatic and semi-aquatic environments: A review

Osborne¹

1984

Plant Growth Regul

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“…In support of this concept, several investigators have reported an increase in auxin concentration (16,19) and the level of a phenolic inhibitor of LAA oxidase (4) and a decrease in IAA oxidase activity (21,27) following application of gibberellin to intact plants. Subsequent work with rice seedlings (10) did not support the thesis that interaction between the hormones proceeds via an auxin-sparing system, albeit that IAA oxidase appears to control coleoptile elongation in this tissue. Other investigators have reported no effect of GA on IAA oxidase (3,26), and recently GA has been shown to increase the oxidase activity (2,7).…”

Section: Promotion Of Iaa Oxidation By Ga3mentioning

confidence: 99%

The Promotion of Indole-3-acetic Acid Oxidation in Pea Buds by Gibberellic Acid and Treatment

Ockerse¹,

Waber²

1970

Plant Physiol.

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Terminal buds of dark-grown pea (Pisum sativum) seedlings have an indole-3-acetic acid oxidase which does not require Mn2+ and 2,4-dichlorophenol as cofactors. Oxidase activity is at least 50 times higher in buds of tall peas than in dwarf seedlings. Administration of gibberellic acid to dwarf peas stimulates both growth and indoleacetic acid oxidase activity to the same levels as in tall seedlings. By contrast, indoleacetic acid oxidation assayed in the presence of Mn2+ and 2,4-dichlorophenol proceeds at similar rates regardless of gibberellin application. Treatment of tall peas with the growth retardant AMO-1618 reduces growth and oxidase activity. Such treated seedlings are indistinguishably dwarf. The enzyme does not appear to be polyphenol oxidase, nor do the results suggest that reduced activity in dwarf buds is due to higher levels of a dialyzable inhibitor. The peroxidative nature of the oxidase is probable.The presence of IAA oxidase in plant tissues has been firmly established (23). The loss of added IAA from tissue extracts has been attributed in part to this enzyme. There is evidence that IAA oxidase is a peroxidase-based enzyme (5,24) and studies in vitro with horseradish peroxidase revealed that IAA is oxidized via a multiplicity of intermediates to oxindole-3-carbinol, which is converted to methyleneoxindole in a postenzymatic step (8,15). In view of the inverse correlation between the levels of this enzyme and ability of pea tissue to respond to IAA, Galston and Dalberg (6) proposed that TAA oxidase is a growth-regulatory system. Thus, the enzyme is thought to inactivate IAA, thereby controlling the endogenous auxin level.In

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“…Recent experiments suggested that ethylene accentuated this type of response to light by fern protonemata. Consequently we were interested in data published by Kefford (1962) on the responses to light of submerged rice seedlings. It is known that rice seedlings grow faster when submerged under water than when grown in air, an effect usually attributed to a low oxygen tension under water.…”

Section: Introductionmentioning

confidence: 99%

Ethylene and the Responses to Light of Rice Seedlings

Miller¹,

Miller²

1974

Physiologia Plantarum

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The growth of rice seedlings (Oryza satira L.) in the presence of ethylene caused a change in the response to light of coleoptile elongation. In plants grown in air without added ethylene coleoptile elongation was promoted by red, far‐red and yellow‐green light only in very young seedlings; in older plants irradiation inhibited the growth of the coleoptile. The effect of growing plants in the presence of ethylene was to prolong the period during which light promoted coleoptile growth. Elongation of the first internode was inhibited by light whether or not the seedlings were grown in the presence of ethylene. A correlation existed between the growth effect of an irradiation and the initial decay rate of phytochrome which was established by the treatment. Regardless of wave length, light sources whose intensities were adjusted to produce a decay rate of about 10% per hour or less induced a moderate rate of coleoptile elongation which persisted for a relatively long period. Irradiation with red or yellow‐green light of higher intensity which produced a higher rate of phytochrome decay induced a higher rate of coleoptile elongation, but growth stopped after several hours. Other observations, however, showed that one cannot establish a general simple correlation between the rate of elongation of rice coleoptiles under light and the status of measurable phytochrome in the plant.

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Auxin-Gibberellin Interaction in Rice Coleoptile Elongation

Cited by 45 publications

References 10 publications

Ethylene and plants of aquatic and semi-aquatic environments: A review

Ethylene and plants of aquatic and semi-aquatic environments: A review

The Promotion of Indole-3-acetic Acid Oxidation in Pea Buds by Gibberellic Acid and Treatment

Ethylene and the Responses to Light of Rice Seedlings

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