Kinetin Modification of Sporeling Ontogeny in Marsilea vestita

Laetsch, W. M.; Briggs, Winslow R.

doi:10.2307/2439328

Cited by 8 publications

(4 citation statements)

References 17 publications

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“…The results of Laetsch and Briggs (1961), where intact plants of the fern, M arsilea vesiita were treated with kinetin through the water-uptake system, confirm many of the data reported herein. Various degrees of growth inhibition were ob-[Vol.…”

Section: Aqe Of Plants In Wilkssupporting

confidence: 84%

Some Effects of Kinetin on the Growth and Flowering of Intact Green Plants

Wittwer

Dedolph

1963

American Journal of Botany

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Wrr-rwicn, S. H., and R. R. Ih;DOJ,PH. (Michigan State U., E. Lansing.) Some effects of kinetin on the growth and flowering of intact green plants. Amer. Jour. Bot. 50(4): 330-336. IIIus. 1()63.-Dry matter accumulation of aerial parts, and heights of tomato, cucumber, and pea plants were markedly reduced when kinetin was incorporated into the culture solution root medium in concentrations ranging from 10-5 to 10-7 M. Concentrations which suppressed top growth (height, dry weight) generally had lesser effects on root growth and, in some instances, enhanced it. Thus top/root ratios were greatly reduced and approached unity in kinetin-treated peas and tomatoes. Flowering was inhibited in tomatoes and accelerated in peas. There were marked changes in root morphology, including the formation of pseudonodules. Kinetin had an effect which was opposite to that of gibberellin on internode elongation, root extension, top/root ratios and flowering of dwarf peas. N6-benzyladenine was more active than kinetin in suppressing the growth of intact green plants. The data show that kinetin can markedly alter the behavior of intact plants when absorbed by the roots from culture solutions in which the concentrations are comparable to those which are biologically active on explants,

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Section: Aqe Of Plants In Wilkssupporting

confidence: 84%

Some Effects of Kinetin on the Growth and Flowering of Intact Green Plants

Wittwer

Dedolph

1963

American Journal of Botany

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“…X 500. Briggs, 1961); and (3) it promotes or initiates callus formation. Specific conditions are apparently required for callus formation, since, e.g., in Phaseolus only the petioles produced callus, while the hypocotyl did not (Humphries, 1960); epicotyls of Vicia faba formed callus strongly, while those of Pisum did not (Wickson and Thimann, 1958).…”

Section: Histological Changes Induced By Kinetin-mentioning

confidence: 99%

The Effects of Auxins and Kinetin on Xylem Differentiation in the Pea Epicotyl

Sorokin¹,

Mathur²,

Thimann³

1962

American Journal of Botany

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SOROKIN, HELEN P., S. N. MATHUR, and KENNETH V. THIMANN. (Harvard U., Cambridge, Mass.) The effects of auxins and kinetin on xylem differentiation in the pea epicotyl. Amer. Jour. Bot. 49(5): 444--454. Illus, 1962.-Treatment of isolated segments from the second internode of etiolated' Alaska' pea epicotyls with indoleacetic acid or 2, 4-D results in: (1) activation of fascicular cambium, and initiation of some interfascicular cambium, resulting in abundant production of secondary xylem, and in formation of hyperplastic tissue; (2) partial or even total occlusion of proto-and metaxylem. The secondary xylem formed consists of short vessel members with scalariforrnly reticulate or pitted walls, which often lack vertical connection with each other, being interrupted by unlignified cells. When IAA is used, the hyperplastic growth mainly takes the formof root primordia, whereas 2, 4-D initiates the formation of callus, but not of root primordia. The growth of this callus causes a characteristic split at the base of the internode. Treatment with kinetin, alone or in combination with the auxin, changes the above structure markedly. It leads to the initiation, over the entire circumference of the core of the internode, of a still more active cambium, which forms several layers of secondary xylem; this oonsists mainly of long vessel members with pitted walls. Hyperplastic growth is completely absent, and the xylem does not become occluded. Thus the effect of kinetin is to make the xylem more normal and to alter the epicotyl structure from herbaceous to more-or-less woody. ABSTRACT ELLINGBOE, ALBERT H., and JOHN It. RAPER. (Harvard U., Cambridge, Mass.) The Buller Phenomenon in Schizophyllum commune: nuclear selection in fully compatible dikaryotic-homokaryotic matings. Amer. Jour. Bot. 49(5): 454-459. l!162.-Internuclear selection in fully compatible, dikaryotic-homokaryotic matings of isogenic strains is apparently controlled by the incompatibility factors and, in some cases, by extra-incompatibility factors. The relationship of the structure of the incompatibility factors to internuclear selection is not clear. Both types of nuclei from the dikaryon migrate into the homokaryon, and it appears that selection occurs in the final establishment of the new dikaryon.

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“…The poor growth in 0.03 % CO2 would suggest therefore that this sugar is poorly absorbed and/or metabolized, [Vol. 55 though it has been reported to support better growth in M. vestita than glucose (Laetsch and Briggs, 1961). The mechanism by which increased pC02 brings about its morphogenetic effects remains entirely unknown.…”

Section: Table~ Mean Dry Weight Of Marsilea Plants Grown In Uartous mentioning

confidence: 99%

Effects of Carbon Dioxide on the Growth and Morphogenesis of Marsilea

Bristow

Looi

1968

American J of Botany

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Increased concentrations of CO2 in air (1–50%) cause young plants of Marsilea vestita to exhibit many characteristics of the water form when they are grown on a solid substrate under sterile conditions. Thus these plants have longer internodes, shorter petioles, more rectangular‐shaped epidermal cells and fewer stomata on the lower leaf epidermis than controls grown in 0.03% CO2. Over a 2‐week period, dry weight increase is considerably greater in 12.5% and 25% CO2 than in 0.03% CO2. Fifty percent CO2 is inhibitory to growth. CO2‐enriched air has the same morphogenetic effect when supplied in the light or the dark. Possible explanations for this effect are discussed.

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Kinetin Modification of Sporeling Ontogeny in Marsilea vestita

Cited by 8 publications

References 17 publications

Some Effects of Kinetin on the Growth and Flowering of Intact Green Plants

Some Effects of Kinetin on the Growth and Flowering of Intact Green Plants

The Effects of Auxins and Kinetin on Xylem Differentiation in the Pea Epicotyl

Effects of Carbon Dioxide on the Growth and Morphogenesis of Marsilea

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