Rhizogénèse adventive dans l'épicotyle du Pois : initiation et structuration de la racine

Nougarède, Arlette; Rondet, Pierre

doi:10.1139/b82-035

Cited by 9 publications

(7 citation statements)

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“…However, when grown in the dark, wild‐type peas produced significantly more adventitious roots than light‐grown wild‐type seedlings ( P < 0.001; Fig. ) consistent with a previous observation (Nougarede and Rondet ). By comparison, the dark‐grown Psccd8 mutant developed no such adventitious roots in the dark, suggesting that strigolactones are required for this response (Fig.…”

Section: Resultssupporting

confidence: 90%

“…In contrast, in intact pea seedlings, we found that dark actually promoted adventitious rooting in wild‐type plants (Fig. ; Table ), similar to the results presented by Nougarede and Rondet (). This contrast between rooting in intact seedlings vs stem cuttings is not understood and must await a full understanding of adventitious root formation from different plant tissues (da Costa et al ).…”

Section: Discussionsupporting

confidence: 90%

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The role of strigolactones in photomorphogenesis of pea is limited to adventitious rooting

Urquhart

Foo

Reid

2014

Physiologia Plantarum

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The recently discovered group of plant hormones, the strigolactones, have been implicated in regulating photomorphogenesis. We examined this extensively in our strigolactone synthesis and response mutants and could find no evidence to support a major role for strigolactone signaling in classic seedling photomorphogenesis (e.g. elongation and leaf expansion) in pea (Pisum sativum), consistent with two recent independent reports in Arabidopsis. However, we did find a novel effect of strigolactones on adventitious rooting in darkness. Strigolactone-deficient mutants, Psccd8 and Psccd7, produced significantly fewer adventitious roots than comparable wild-type seedlings when grown in the dark, but not when grown in the light. This observation in dark-grown plants did not appear to be due to indirect effects of other factors (e.g. humidity) as the constitutively de-etiolated mutant, lip1, also displayed reduced rooting in the dark. This role for strigolactones did not involve the MAX2 F-Box strigolactone response pathway as Psmax2 f-box mutants did not show a reduction in adventitious rooting in the dark compared with wild-type plants. The auxin-deficient mutant bushy also reduced adventitious rooting in the dark, as did decapitation of wild-type plants. Rooting was restored by the application of indole-3-acetic acid (IAA) to decapitated plants, suggesting a role for auxin in the rooting response. However, auxin measurements showed no accumulation of IAA in the epicotyls of wild-type plants compared with the strigolactone synthesis mutant Psccd8, suggesting that changes in the gross auxin level in the epicotyl are not mediating this response to strigolactone deficiency.

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Section: Resultssupporting

confidence: 90%

Section: Discussionsupporting

confidence: 90%

The role of strigolactones in photomorphogenesis of pea is limited to adventitious rooting

Urquhart

Foo

Reid

2014

Physiologia Plantarum

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“…The root cap of Lycopersicon esculentum was found to consist of 2-3 tiers of cells at emergence (Byrne et al 1975) and that of Chrysanthemum morifolium of 2-5 tiers (Stangler 1956). Nougarede & Rondet (1982) found only a primordial root cap in emerging adventitious roots of Pisum sativum. This cap was shed at emergence and replaced by a permanent root cap.…”

Section: Discussionmentioning

confidence: 99%

Morphogenesis of the root cap in adventitious roots of Salix viminalis

Fjell

1985

Nordic Journal of Botany

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Fjell, I. 1986. Morphogenesis of the root cap in adventitious roots of Salix viminalis. -Nord. J. Bot. 5 : 555-573. Copenhagen. ISSN 0107455X.The preformed root primordia in stems of Salk viminalis L. consist of undifferentiated cells. Forty-eight hours after activation of the primordia in cuttings a root cap meristem was initiated four to five cell tiers from the surface of the primordia. The cells distal to the meristem divided only in an anticlinal plane, while in the meristem they divided mostly periclinally but sometimes anticlinally. After 72 hours a columella was established and the amyloplasts began to sediment in response to gravity. Shortly after this stage the roots began to bend slightly downward, probably as a geotropic response. Six days after activation the root cap consisted of up to 15 tiers of cells. The ultrastucture of the cap cells just prior to emergence was studied in more detail. The plastids in the cells adjoining the root proper were typical proplastids. Distal to this cell tier starch accumulated in the plastids. In the fifth tier the amyloplasts were fully sedimented to the lowermost cell walls. The amount of ER increased with the distance from the initial cells and most of it was located at the distal periclinal cell wall. The nucleus and the vacuoles in the geo-sensitive cells occurred in the space above the sedimented amyloplasts. The cytoplasm was less electron opaque than in the initial cells and the mitochondria had more cristae. In the distal cells of the columella and the lateral root cap secretion of mucilage seemed to have started. Numerous large dictyosomes were associated with large vesicles containing a fibrillar or granular material. The plasmalemma lining the distal periclinal cell wall had separated from the wall. A fibrillar material was present between the plasmalemma and the wall and also in intercellular spaces outside the root cap.

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“…Cette observation rejoint celles dCja rapportCes quant 2 l'origine des racines adventives a partir d'organes aCriens chez diffkrentes especes (Brossard 1977;Brossard-Chriqui 1980;Iskander et Brossard-Chriqui 1980;Nougarede et Rondet 1982; M. L. Projetti et D. Brossard~h r i q u i , en prkparation) et confirme l1hypoth?se de l'existence de cellules-cibles privilCgiCes. L'Ctude de la sCquence de la riactivation qui conduit a la caulogenkse met, par contre, en…”

Section: Discussionunclassified

Comparaison des aptitudes morphogénétiques des étamines fertiles ou stériles d'Actinidia chinensis cultivées in vitro

Brossard-Chriqui¹,

Tripathi²

1984

Can. J. Bot.

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R e p le 29 septembre 1983 BROSSARD-CHRIQUI, D., et B. K. TRIPATHI. 1984. Comparaison des aptitudes morphogCnCtiques des Ctamincs fertiles ou stCriles d'Actiniclia cl~it~erlsis cultivCes in vitro. Can. J. Bot. 62: 1940-1946. La culture ir~ vitro de racines nCoformCes partir de filets staminaux d'Actinidia chitlerlsis PI. permet une reginkration a haute friquence de plantules. L'initiation de bourgeons sur des racines est favorablement influencde par la zCatine. Des differences potentielles entre les Ctamines issues de plantes d ou 9 sont aussi dCmontrCes. Sur un mCme milieu, les Ctamines stCriles manifestent une plus grande aptitude a la rhizogenkse que les Ctamines fertiles; ces dernikres ont, par contre, une tendance plus marquCe former des cals. Ces diffkrenccs sont transmissiblcs au travcrs de la dtdiffkrenciation; les racines nCoformtes d'origine 9 ont un faible potentiel de rCgCnCration de bourgeons tandis que celles d'origine d donnent naissance B de nombreux cals et bourgeons. Les implications de ces observations dans la relation entre les teneurs endogknes en auxines et en cytokinines et la nature d ou 9 des plantes sont discutCes. L'originc histologique de ces divers types de rCgCnCrations est aussi examinie et conduit a I'idCe de la prkservation d'un potentiel rhizogtnc par la gaine pirifasciculaire des Ctamines et d'un potentiel caulogkne par le pCricycle des racines nCoformCes. Ces donnCes sont discutCes en fonction de la bibliographic rkcente. BROSSARD-CHRIQUI, D., and B. K. TRIPATHI. 1984. Comparaison des aptitudes morphogCnCtiques des Ctamines fertiles ou stCriles d'Actinidia chitlensis cultivCes in vitro. Can. J. Bot. 62: [1940][1941][1942][1943][1944][1945][1946]. High frequency plantlet regeneration is obtained by means of in vitro culture of neoformed roots arising from Actit~idicl chirlensis PI. stamens. The favourable influence of zeatin upon bud initiation from roots is demonstrated. Potential differences between stamens coming from d or 9 plants are also shown. On the same medium, sterile stamens exhibit a greater rooting potential than fertile ones, but the latter have a more pronounced callusing efficiency. These differences are transmittable through dedifferentiation; neoformed roots of 9 origin have a weak bud regeneration ability, whereas roots of d origin give rise to callus and buds. The implications of such observations in regard to the endogenous contents of auxins and cytokinins and their relations with the d or 9 nature of the plants are discussed. The histological origin of the different kinds of regeneration are also examined and point to the preservation of rooting potential by the bundle sheath of the stamens and of budding potential by the pericycle of neoformed roots. Thcse data are considered in relation to the recent literature.

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Rhizogénèse adventive dans l'épicotyle du Pois : initiation et structuration de la racine

Cited by 9 publications

References 0 publications

The role of strigolactones in photomorphogenesis of pea is limited to adventitious rooting

The role of strigolactones in photomorphogenesis of pea is limited to adventitious rooting

Morphogenesis of the root cap in adventitious roots of Salix viminalis

Comparaison des aptitudes morphogénétiques des étamines fertiles ou stériles d'Actinidia chinensis cultivées in vitro

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