Zur entwicklungsphysiologie der schraubigen blattstellung

Schmucker, Th.

doi:10.1007/bf01937560

Cited by 9 publications

(4 citation statements)

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“…As noted by Schmucker (1933), double or bilobed leaflets were common on rachises bearing both odd-and even-numbered leaflets. A bilobed leaflet formed when a lateral leaflet was partially fused with the terminal leaflet, appeared to be dissected from the side of the terminal leaflet, or exhibited any condition in between.…”

Section: Methodsmentioning

confidence: 72%

“…However, as observed in other species with decussate phyllotaxis (Rutishauser 1981), one leaf of a pair may sometimes be inserted at a slightly higher level in the node. In stump sprouts of Fraxinus excelsior, Schmucker (1933) observed transformations from decussate to helical phyllotaxis. The helical pattern was present in the winter bud and it was often expressed for several seasons before reverting to the normal pattern.…”

Section: Introductionmentioning

confidence: 94%

“…Simple leaves are followed by pinnate leaves of increasing complexity and these are often intermixed with transitional leaves having rather bizarre shapes. For example, Schmucker (1933) described double leaflets or leaflets with bifurcated tips occurring on leaves at one side of nodes in F . excelsior.…”

Section: Introductionmentioning

confidence: 99%

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Rachis vascularization and leaflet venation in developing leaves of Fraxinus pennsylvanica

Larson¹

1985

Can. J. Bot.

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LARSON, P. R. 198.5. Rachis vascularization and leaflet venation in devclopiny leaves of Frcrsinu.spenn.sy/vnnica. Can. J . Bot. 63: 2383-2392. Leaves of Fraxi~l~i.spent~.sylvnt~ica are sewcd by a double tracc that exits thc stcm vasculature through a single gap. During embryonic leaf dcvclopment, the leaf traces subdivide in the nodc to produce subsidiary bundlcs that differentiate acropetally in the leaf base and basipetally in the stem. The acropetal bundles converge distally in the node to form a rachis vasculature consisting of a semicircular arc joined by a ventral chord. Each lateral leaflet is vascularizcd by bundles contributed by both the semicircular arc and the ventral chord of thc rachis. Onc rachis ridge bundle divides to form two leaflet ridge bundles and a new rachis ridgc bundle diverges from thc ventral chord. Thc lcaflct ridge bundlcs diverge as basal vcins and subsequent secondary veins diverge from the midvein in an approximate right-left scqucnce. Grecn ash has odd pinnate leaves; the terminal leaflet is vascularized by the rachis residual following departure of thc last leaflet pair. Secondary vcins extcnd to the lamina margins and then curvc upward to initiate thc marginal loops of the brochidodromous venation. Periclinal divisions occur in close association with secondary vcins in the prospective platc meristem region. Anticlinal divisions occur in subepidermal layers of the internal ridge points in the prospectivc palisade mesophyll rcgion.The lattcr divisions probably contribute both to lamina extension and to spreading of the conduplicatcly folded lamina wings. LARSON, P. R. 198.5. Rachis vascularization and lcaflct venation in developing leavcs of Frcrxinus pe~~n.sylvc:r~ica. Can. J . Bot. 63: 2383-2392. Les feuilles du Frclxinus pennsylvar~icn comportent unc double tracc foliairc qui les relie au systeme vasculaire de la tige par une breche foliaire simple. Au cours du dCveloppcment de la fcuillc, les traces foliaires se subdiviscnt dans le noeud pour produire des faisceaux subsidiaires qui sc diffkrencient en direction acropitte dans la base de la feuille et de faqon basipete dans la tige. Les faisceaux acropetes convergent distalement dans le nocud pour former unc vascularisation en rachis lequel consiste cn un arc semicirculaire reliC par un cordon ventral. Chaque foliole IatCral cst vascularis6 par des faisceaux issus a la fois de I'arc semicirculaire et du cordon ventral du rachis. Un faisceau de la crCtc du rachis se subdivise pour former deux faisceaux de la crCte des folioles, et un novueau faisceau de la crCte du rachis diverge du cordon ventral. Les faisceaux de la cr&te du rachis des folioles divergent et formcnt les nervures basales, et Ics ncrvures secondaires subskquentes divergent de la nervure centrale dans unc sCquence j. peu pres gauche-droite. Le fritne de Pcnnsylvanie possede des feuillcs pennCes impaircs; le foliole terminal est vascularisC par les rCsidus du rachis suite au ddpart de la dernierc pairc de folioles. Les nervures sccondaires s'Ctcndent jusqu'aux m...

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Section: Methodsmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 94%

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Rachis vascularization and leaflet venation in developing leaves of Fraxinus pennsylvanica

Larson¹

1985

Can. J. Bot.

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“…We propose to give the name 'repulsion theory' to the theory that each new leaf arises at the greatest possible distance from the slightly older leaves which form the uppermost cycle round the apex. Suggestions of this kind were made by Schmucker (1933) and by Priestley & Scott (1933), who wrongly attributed the same idea to Hofmeister (1868); and the idea has probably occurred at some time to most people interested. Different from this is the theory for which we claim to have produced evidence previously (1931,1933,1935), that each new leaf arises in the first available space on the apex above and between the existing leaves or other contact members in the top cycle-that is to say, in the first space which attains both some necessary width and some necessary distance below the extreme growing-point.…”

Section: The Repulsion Theory and The Theory Of The First Available Smentioning

confidence: 99%