The Initiation and Development of Lateral Meristems in the Pea Root

Pecket, R. C.

doi:10.1093/jxb/8.2.172

Cited by 30 publications

(22 citation statements)

References 2 publications

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“…Finally, only the root apex stained deeply with Schiff's reagent in roots cultured in dicambafree medium, whereas roots cultured in the presence of dicamba developed a dense formation of nodular structures along the length of the vascular cylinder by 48 h of culture. These macroscopically visible structures, which stained deeply with Schiff's reagent, represented newly elaborated root primordia (2,3,19,24,31). The cessation of root growth and appearance of these root primordia after culture with dicamba are consistent with the idea that cell division activity ceased in the root apex and was initiated in nonapical regions of the root.…”

Section: Resultssupporting

confidence: 68%

“…tured roots, presumably by impairing cell divisions in the apical root meristem (19,21,25,26,27,31). In direct contrast, these auxins also show a promotive effect on cell divisions associated with the initiation and elaboration of root primordia (3,21,23,24,26,30).…”

Section: Introductionmentioning

confidence: 99%

“…Decapitation of root apical meristems also promotes lateral root development (3,8,18,23,24,32). The reduction in primary root growth and the promotive effect on primordium development are dependent on the concentration of auxin used; however, lateral root emergence through cortical tissues and their continued growth does not appear to be affected by auxin in the same way as root primordia elaboration (3,17,19,26,31).…”

Section: Introductionmentioning

confidence: 99%

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The indirect effect of exogenous auxin on initiation of cell divisions in wheat root expiants (Triticum aestivum) during callus induction

Kudirka¹,

Brightwell²

1989

Can. J. Bot.

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1989. The indirect effect of exogenous auxin on initiation of cell divisions in wheat root explants (Triticum aestivum) during callus induction. Can. J. Bot. 67: 1979Bot. 67: -1984 Mitotic activity (indices) was measured in apical and nonapical regions of primary root explants excised from 2-day-old germinating seedlings of wheat (Triticum aestivum Thell em L.) and cultured in the presence of the synthetic auxins 3,6-dichloro-0-anisic acid (dicamba) and 2,4-dichlorophenoxyacetic acid (2,4-D). Mitotic activity in the root apical meristem decreased with increasing concentration of auxin in the culture media. Correlated with the decrease of mitotic activity in the root apical meristem was an increase of mitotic activity in nonapical regions of the root. The degree of cell division activity initiated in nonapical regions of the root was (i) inversely proportional to the degree of inhibition of cell divisions in the root apex, but (ii) independent of the concentration of auxin in the culture medium. These data suggest that the primary effect of these synthetic auxins on mitotic activity in wheat root explants is to suppress cell divisions in the primary root apex and not to stimulate cell divisions in the nonapical regions of the root. Cell cycle control in nonapical regions of the root appears to be a function of factor(s) emanating from mitotically active cells of the primary apical meristem. KUDIRKA, D. T., et BRIGHTWELL, B. B. 1989. The indirect effect of exogenous auxin on initiation of cell divisions in wheat root explants (Triticum aestivum) during callus induction. Can. J. Bot. 67 : 1979-1984. L'activitC mitotique fut mesurCe dans les regions apicales et non-apicales d'explants de racines primaires excisCes de plantules de blC (Triticum aestivum Thell em L.) lgCes de 2 jours et cultivCes en prCsence des auxines synthktiques: l'acide 3,6-dichloro-0-anisique (dicamba) et l'acide 2,4-dichlorophCnoxy-acCtique (2,4-D). L'activitC mitotique dans le mCristbme apical de la racine diminue avec l'accroissement de la concentration en auxine du milieu de culture. L'augmentation d'activitC mitotique dans les rCgions non-apicales de la racine est correlCe avec la diminution de I'activitC mitotique du mCristbme apical de la racine. Le degrC d'activitC de la division cellulaire initiie dans les rCgions non-apicales de la racine est: (i) inversement proportionnel au degrC d'inhibition des divisions cellulaires dans l'apex racinaire mais (ii) indCpendant de la concentration en auxine dans le milieu de culture. Ces rCsultats suggbrent que l'effet primaire de ces auxines synthCtiques sur I'activitC mitotique des explants de racine de blC consiste dans la suppression des divisions cellulaires dans l'apex de la racine primaire, mais non pas dans la stimulation des divisions cellulaires dans les rCgions non-apicales de la racine. Le contr6le du cycle cellulaire dans les regions non-apicales de la racine semble &tre une fonction de facteur(s) Cmanant de cellules mitotiquement actives du miristbme apical de la racine primaire.[Tradui...

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Section: Resultssupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The indirect effect of exogenous auxin on initiation of cell divisions in wheat root expiants (Triticum aestivum) during callus induction

Kudirka¹,

Brightwell²

1989

Can. J. Bot.

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“…I-Iowever, evideilce for correlative effects on lateral root initiation in peas has been reported by Pecket (14,15) and by Torrey (23,24,26), who also reviewed other \voi-lr on this topic. Some experiments on this point were made during the worl; reported here.…”

Section: A -mentioning

confidence: 91%

The Growth Curve and Growth Correlations of Excised Tomato Roots Grown in Sterile Culture

Boll¹

1965

Can. J. Bot.

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T h e curve o f growth in length o f the main axis o f excised tomato roots, grown in a 6-day passage, shows a 'lag phase' at the beginning and a decrease in growth rate toward the end of the passage when growth o f the apex is inhibited b y the older tissues. T h e 'lag phase' is neither due to transfer o f the excised tip t o fresh medium nor a consequence of the developmental stage at which the tip is excised. T h e 'lag phase' may mean that the apical meristem requires s~~bstances supplied by the older tissues, but it is, at least in part, due t o injurious effects o f excision. From surgical experiments it is concluded that the growth o f lateral roots is promoted by the presence o f older tissues and inhibited by the main apes and younger parts o f the main axis. A con~parison is made between this latter effect and apical dominance in shoots.

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“…The formation of lateral roots has been amply demonstrated to be under the control of plant hormones [1,2,17,20,23]. There is much less data indicating that root branching may be controlled by other factors including inorganic nutrition [6][7][8]12] or light [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of inorganic nutrition on the formation of lateral roots in Dracaena fragrans Ker-Gawl cultured in vitro

Vinterhalter

1992

Plant Cell Tiss Organ Cult

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The effect of inorganic nutrition on the formation of lateral roots has been studied in Dracaena fragrans Ker-Gawl cultured in vitro. MS macronutrient salts imposed inhibition of lateral root formation in =95% of primary adventitious roots which could be overcome by: -decrease of concentration of all 5 macronutrient salts, -significant decrease or omission of MgSO4, or -decrease or omission of both KNO 3 and NH4NO 3. Inhibitory effect has been further confirmed to appear as the result of inadequate balance of SO 2-with NO 3 and NH 4 ions in the MS formulation of inorganic salts.

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The Initiation and Development of Lateral Meristems in the Pea Root

Cited by 30 publications

References 2 publications

The indirect effect of exogenous auxin on initiation of cell divisions in wheat root expiants (Triticum aestivum) during callus induction

The indirect effect of exogenous auxin on initiation of cell divisions in wheat root expiants (Triticum aestivum) during callus induction

The Growth Curve and Growth Correlations of Excised Tomato Roots Grown in Sterile Culture

Effect of inorganic nutrition on the formation of lateral roots in Dracaena fragrans Ker-Gawl cultured in vitro

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