Vascular System of Lodicules of Dactylis Glomerata L.

Pizzolato, Thompson Demetrio

doi:10.1002/j.1537-2197.1983.tb12427.x

Cited by 4 publications

(1 citation statement)

References 26 publications

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“…Organ or tissue area (a e ) was estimated on every fi fth serial section by tracing their outlines projected through a drawing tube attached to a Wild M20 microscope (Martin Microscope Co, Easley, S.C.), followed by referencing to a 0.25-mm 2 standard. Tracings were cut out and their areas (Pizzolato, 1983) determined with a LI-3000A area meter (LI-COR, Lincoln, Nebr.). Organ or tissue volume (V o ) was calculated using the equation: V o = (Σa e )t.…”

Section: Osmotic Priming and Germinationmentioning

confidence: 99%

Germination and Embryo Anatomy of Osmotically Primed Parsley Schizocarps

Olszewski¹,

Pill²,

Pizzolato³

2004

jashs

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`Moss Curled' parsley [Petroselinum crispum (Mill.) Nyman ex. A.W. Hill] schizocarps were osmotically primed in polyethylene glycol at -1.0 MPa for 7 days at 20 °C. The smaller of the two mericarps within a parsley schizocarp had lower germination percentage, but similar rate and synchrony of germination. Osmotic priming increased germination percentage, rate, and synchrony, irrespective of mericarp half. This promotive effect of priming on germination was associated with embryonic advancement as indicated by a doubling of radicle and cotyledon volumes, without changes in lengths of these organs. Periclinal divisions of the lateral expansion meristem, distinct in primed radicles but indistinct in nonprimed radicles, led to radial alignment of the cortical cells and a doubling of cortical volume and thereby increased radicle volume. Each embryonic cotyledon of primed mericarps had three distinct procambial bundles that differentiated along most of the cotyledon length, while nonprimed cotyledons had from zero to three that differentiated only a short way into the cotyledon. Priming increased coyledonary procambium length by 5-fold and volume by 11-fold. Increased embryonic growth due to priming was associated with greater endosperm depletion adjacent to the embryo. The schizocarps frequently separated or partially separated into component mericarps during priming, indicating a weakening of pericarp tissue along the commissural suture and possibly elsewhere.

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Section: Osmotic Priming and Germinationmentioning

confidence: 99%

Germination and Embryo Anatomy of Osmotically Primed Parsley Schizocarps

Olszewski¹,

Pill²,

Pizzolato³

2004

jashs

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A Three‐dimensional Reconstruction of the Vascular System to the Lodicules, Androecium, and Gynoecium of a Fertile Floret of Panicum Dichotomiflorum (Gramineae)

Pizzolato

1983

American J of Botany

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A three‐dimensional reconstruction of a fertile floret stele of Panicum dichotomiflorum approaching anthesis was made by a new technique using superimposition of tracings of 80, 1‐μm thick serial sections, cleared tracing film, and mounting adhesive. From a collateral bundle, which also served as the median trace to the fertile lemma, most of the vascular tissue branched adaxially and horizontally to become the sole vascular supply to the two lodicules, three stamens, and pistil. The xylem branched at a low level to form a broad and long vessel plexus. The phloem branched at a higher level to overlay the vessel plexus on the right and left with an arc of horizontal sieve tubes in a phloem plexus. Those sieve tubes and vessels which rose after branching from the horizontal plexi assumed a more vertical course in the floret stele. Traces to the right and left lodicules arose from the lower abaxial portions of the flanks of the floret stele. Vessels ascended vertically from the xylem plexus and passed through the phloem plexi and joined with the sieve tubes there to exit at the same level and become the right and left lodicule traces. The vascular tissues to the three filament traces arose from different higher levels of the stele. The sieve tubes for the median filament trace arose vertically from the abaxial side between but above the lodicule traces. At higher levels the sieve tubes for the lateral filaments rose from the horizontal arcs of the flanks of the stele and departed it tangentially. The vessels destined to the filament traces arose in the center of the floret stele from adaxial portions of the horizontal plexus, ascended between the arcs of phloem, exited the stele simultaneously above the phloem of the traces, and followed the courses of their respective sieve tubes. The adaxially displaced apex of the floret stele then contained the vascular tissue related to the pistil. All the sieve tubes and vessels of the floret stele were embedded in a matrix of intermediary cells. The peripheral intermediary cells associated with the vessel plexus were xylem transfer cells with pronounced wall ingrowths. At higher levels in the floret stele, intermediary cells in scattered locations near sieve tubes or vessels had less conspicuous wall ingrowths. No preferred orientation of transfer cells with any particular trace was noted.

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Vascular System of the Floret of Leersia Virginica (Gramineae‐oryzoideae)

Pizzolato

1989

American J of Botany

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The vascular system of the floret of Leersia is unified yet is segmented according to the appendages it serves. The rachilla at the floret base contains a collateral bundle related to the median trace of the lemma. The palea median trace joins the posterior of this bundle in the rachilla as the lemma laterals merge with the anterior. Although the stamen traces enter at the flanks of this rachilla bundle, they do not become fully incorporated into the system until near the floret base where the rachilla bundle, lemma laterals, and palea laterals converge. Traces from the lodicules attach to the anterior of the stamen traces. The base of the vascular system of the pistil, the pistil plexus, attaches tenuously by a bundle to the lower system between the entrance of the stamen traces. A bundle from each style attaches near the anterior of the pistil plexus below the level where the posterior of the pistil plexus rises, as the placental bundle, to merge with the ovule. Characteristics of the vascular system of Leersia, such as the relative discreteness of the staminal and stylar traces and the lack of both the anterior pistil bundle and the xylem discontinuity, are useful for delimiting the Oryzoideae from the Festucoideae.

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Vascular System of Lodicules of Dactylis Glomerata L.

Cited by 4 publications

References 26 publications

Germination and Embryo Anatomy of Osmotically Primed Parsley Schizocarps

Germination and Embryo Anatomy of Osmotically Primed Parsley Schizocarps

A Three‐dimensional Reconstruction of the Vascular System to the Lodicules, Androecium, and Gynoecium of a Fertile Floret of Panicum Dichotomiflorum (Gramineae)

Vascular System of the Floret of Leersia Virginica (Gramineae‐oryzoideae)

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