Effects of Kinetin on Tiller Bud Elongation in Wheat (Triticum aestivum L.)

Länger, Reinhard; Prasad, P. C.; Laude, Horton M.

doi:10.1093/oxfordjournals.aob.a084721

Cited by 59 publications

(30 citation statements)

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“…This model, based on lateral bud release in oat shoots, supports the classical apical dominance theory for control of shoot development that has been promulgated for dicots (19) and for monocots (10). The inhibition by auxin of kinetin-induced tiller release from quiescence and prophyll elongation indicates that the cytokinin to auxin ratio is an important factor in determining whether tillers are released or whether adventitious roots form.…”

Section: Discussionsupporting

confidence: 76%

“…Tiller release during the emergence of the flag leaf and inflorescence may be due to an increase in the amount of cytokinin flow in the xylem from the roots up the stem to inflorescence, as suggested by Beevers and Woolhouse (2). Langer et al (10) also reported that the release of buds at this stage is not associated with auxin since it is not influenced by TIBA treatment.…”

Section: Discussionmentioning

confidence: 89%

“…Early studies on the control of tiller release by Leopold (11) indicate that grasses are under the same type of apical control as in dicots, namely, that auxin in the apical bud of the main axis inhibits tillering, and removal of this source by decapitation or by application of the auxin transport inhibitor TIBA2 releases the buds from apical control. Langer et aL (10) found that kinetin stimulates lateral bud release in wheat and suggested that kinetin may act by increasing the flow of assimulates within the shoot to the axillary bud site. They also found that grasses have two phases of tiller development control: one which inhibits buds by apical control and another which releases tillers after the emergence of the inflorescence from the last (flag) 'This work was supported by National Aeronautics and Space Administration Grant NAGW-34.…”

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confidence: 99%

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Hormonal Regulation of Lateral Bud (Tiller) Release in Oats (Avena sativa L.)

Harrison

Kaufman²

1980

Plant Physiol.

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Stem segments containing a single node and quiescent lateral bud (tiller) were excised from the bases of oat shoots (cv. 'Victory') and used to study the effects of plant hormones on release of lateral buds and development of adventitious root primordia. Kinetin (10-5 and 10-6 molar) stimulates development of tifllers and inhibits development of root primordia, whereas indoleacetic acid (IAA) (10-' and 10-6 molar) causes the reverse effects. Abscisic acid strongly inhibits kinetin-induced tiDler bud release and elongation and IAA-induced adventitious root development. IAA, in combination with kinetin, also inhibits kinetin-induced bud prophyll ( The role of plant hormones in the regulation of lateral bud development in dicots has been studied by many investigators (1,12,13,19 leaf.It is well-established that regeneration of roots at the basal ends of cuttings is regulated by auxin (15)(16)(17). Skoog and Miller (14) found that, in tobacco callus tissue cultures, a high auxin to cytokinin ratio stimulates root production.In light of the fact that hormonal regulation for bud release and adventitious root development in grasses is so poorly understood, it was decided to reinvestigate this problem, using excised oat stem segments and intact oat plants as experimental systems. MATERIALS AND METHODSPlant Materials. Oats (Avena sativa L. cv. 'Victory') were ger- Experiments with Intact Plants. In these experiments, entire flats of oats were either left upright or placed horizontally for geostimulation treatment. Decapitation of shoots was performed by excising the shoots below the p-node (first node below the peduncle, the main axis of the inflorescence) (Fig. 1). The amount of bud release from the p-5 node was analyzed following geostimulation, decapitation, and treatment with kinetin (10-5 M), TIBA (10-5 M), PCIB (l0-5 M), a-naphthaleneacetic acid (l0-5 M), or IAA (l0-5 M). For these growth regulation treatments, shoots were sprayed every day for 3 days, and per cent tiller release was determined on the 4th day. Tween 20 (0.1%) (v/v) and dimethyl sulfoxide (0.1%) (v/v) were included in the growth regulator solutions to aid penetration of hormones into shoot tissues. These experiments with intact plants were repeated at least three times.Experiments with Excised Stem Segments. Segments (2-3 cm in length) containing a single node, a quiescent axillary bud (1.5-2 mm in length) which will form a tiller shoot, and portions of the internode on either side of it were excised below the p-5 node (Fig.

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Section: Discussionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 89%

mentioning

confidence: 99%

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Hormonal Regulation of Lateral Bud (Tiller) Release in Oats (Avena sativa L.)

Harrison

Kaufman²

1980

Plant Physiol.

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“…Many studies reported that exogenous cytokinins, such as BA, kinetin and 2ip, caused lateral bud outgrowth and elongation in several dicotyledons, and increase in tillering in wheat, oat, and barley (Wickson and Thimann, 1958;Langer et al, 1973;Harrison and Kaufman, 1980;Sharif and Dale, 1980;Isbell and Morgan, 1982;Fosket, 1998). Our observation from experiments with cv.…”

Section: Discussionmentioning

confidence: 99%

“…In grasses, hormonal regulation of lateral bud release and growth has also received attention. Langer et al (1973) found that kinetin promoted tiller bud elongation and dry-weight gain in wheat in experiments with excised tiller buds isolated during the period from the appearance of double ridges to ear emergence. Studies in barley by Sharif and Dale (1980) indicated that supplying cytokinin through the roots enhanced the growth of tiller buds but foliar spray was ineffective.…”

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confidence: 97%

Effects of Foliar and Root-Applied Benzylaminopurine on Tillering of Rice Plants Grown in Hydroponics

Liu

Goto

Nishiyama

et al. 2001

Plant Production Science

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Einfluß von Stickstoff‐ und Cytokiningaben auf die Entwicklung des Fahnenblattes und der Karyopsen von Weizen

Herzog

1981

J Plant Nutrition & Soil

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In zwei Hydrokultur‐Experimenten mit Sommerweizen cv. Solo wurde unter Gewächshausbedingungen der Einfluß von Cytokiningaben in der Kornfüllungsperiode (Cy: 0–100 μg BA/l Nährlsg.) im Zusammenhang mit variierter Stickstoffzufuhr (N: 0, 0.25, 0.50 und 4.0/1.3 mMol/l) auf die Fahnenblatt‐ und Kornentwicklung geprüft. Bezüglich der Blattentwicklung wurde eine Erhöhung bzw. eine verzögerte Abnahme der spezifischen FM‐ und TM‐Gewichte nur durch N erzielt, während Effekte im Sinne einer Seneszenzhemmung in der Entwicklung der Spitzenvergilbung, des Chlorophyll‐ und N‐Gehaltes sowie der Photosyntheserate sowohl durch N als auch Cy erzeugt werden konnten. Hinsichtlich der Kornentwicklung begünstigte N das EKG und den N‐Gehalt, wobei erstere Wirkung spät, letztere jedoch frühzeitig sichtbar wurde. Zur Reife zeigte Cy gleiche Effekte, deren zeitliche Ausprägung jedoch leicht modifiziert war. Bei hohem N‐Angebot wirkten die Cy‐Applikationen auf den Chlorophyllgehalt, die Assimialtion und den N‐Gehalt des Fahnenblattes sowie des Kornes jedoch negativ (Interaktion), so daß insgesamt zu folgern ist, daß Cy nur bei geringer bis mäßiger N‐Zufuhr in der Kornfüllungsperiode für die Ausbildung der genannten Merkmale begrenzend ist.

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Effects of Kinetin on Tiller Bud Elongation in Wheat (Triticum aestivum L.)

Cited by 59 publications

References 3 publications

Hormonal Regulation of Lateral Bud (Tiller) Release in Oats (Avena sativa L.)

Hormonal Regulation of Lateral Bud (Tiller) Release in Oats (Avena sativa L.)

Effects of Foliar and Root-Applied Benzylaminopurine on Tillering of Rice Plants Grown in Hydroponics

Einfluß von Stickstoff‐ und Cytokiningaben auf die Entwicklung des Fahnenblattes und der Karyopsen von Weizen

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