Structure and development of vegetative buds, from the lower crown of Picea abies

Hejnowicz, A.; Obarska, E

doi:10.1051/forest:19950504

Cited by 23 publications

(16 citation statements)

References 11 publications

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“…For other woody species, extension duration depends on nutrient availability (Kozlowski and Ward 1961;Walters and Soos 1963;Borchert 1991;Collet et al 1997), weather conditions (Hejnowicz and Obarska 1995) and genetic factors (Irgens-Moller 1960;Kozlowski 1964). The results of the present study indicate that the position of a shoot on its parent shoot may have an important influence on extension duration which, in N. antarctica depends, to a large extent, on the time of growth cessation.…”

Section: Growth Periodmentioning

confidence: 54%

Annual shoot-growth in Nothofagus antarctica (G. Forster) Oersted (Nothofagaceae) from northern Patagonia

Stecconi¹,

Puntieri²,

Barthélémy³

2000

Trees

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The growth dynamics of annual shoots of Nothofagus antarctica shrubs from northern Patagonia was studied. The pattern of extension of the shoots derived from the three most distal buds of 100 parent shoots was registered. Weekly measurements and observations of extending shoots were carried out during the 1996-1997 growth season. The date of shoot extension initiation was less variable than the date of shoot extension cessation. Extension curves had an asymmetrically sigmoid outline. Most extension took place uninterruptedly between mid-September 1996 and the end of January 1997. Extension rate reached its highest value in the second half of the extension period. Leaf unfolding rate had a peak early in the extension period and fluctuated irregularly later on. The apical meristem of all shoots died by the end of shoot extension. In general terms, shoot length, diameter, leaf number and extension duration decreased from the first to the third position from the parent shoot's apex, although exceptions to this pattern were found. Shoot extension rate was affected by maximum and minimum daily temperatures but not by the amount of precipitation during the extension period. The size of a bud was not related to the size of the shoot derived from it. The size of shoots in the third position from the apex was related to parent shoot size; this was not the case for more distal shoots.

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Section: Growth Periodmentioning

confidence: 54%

Annual shoot-growth in Nothofagus antarctica (G. Forster) Oersted (Nothofagaceae) from northern Patagonia

Stecconi¹,

Puntieri²,

Barthélémy³

2000

Trees

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“…With respect to the morphological and anatomical structure, the analysed winter embryonic shoots of Norway spruce did not differ from those described by other authors in this species and in other species of the genus Picea [5,8,13]. However, considerable differences in starch content and cell ultrastructure could be observed between the two dates of collection.…”

Section: Discussionmentioning

confidence: 67%

“…Observations of pine buds under a light microscope show that starch is absent in winter and reappears in March [7]. Also in a spruce winter bud no starch has been detected [8]. In other study the chloroplast ultrastructure in vegetative buds of spruce was characterised by relatively large starch grains.…”

Section: Discussionmentioning

confidence: 99%

“…This suggests that the number of aldehyde groups has decreased so much that they ceased to be detectable by the PAS reaction. The relationship between starch synthesis and glucose released from tannins has been postulated by Hejnowicz [6][7][8] for both spruce and pine. Our observations suggest that this hypothesis is true.…”

Section: Discussionmentioning

confidence: 99%

“…Some information on the microscopic structure of spruce buds has been published (e.g. [5,8,13]), but most of it does not concern Norway spruce. Thus the knowledge of changes in the structure and ultrastructure of embryonic shoot is still insufficient.…”

Section: Introductionmentioning

confidence: 99%

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Mid-winter ultrastructural changes in the vegetative embryonic shoot of Norway spruce [Picea abies (L.) Karst.]

Guzicka

Woźny

2003

Ann. For. Sci.

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-Ultrastructural changes in the winter embryonic shoot of Norway spruce are described. In January some cell elements did undergo considerable changes, even within several days, while morphological and anatomical changes were not observed. These ultrastructural changes were observed primarily within plastids (starch accumulation) and tannin vacuoles (the disappearance of aldehyde groups). A glucose released from tannins seems to be utilized for starch synthesis at the time of breakage of winter dormancy. plastid / starch / tannin vacuoleRésumé -Changements ultrastructuraux de la tige embryonnaire végétative de Picea abies en hiver. Les changements ultrastructuraux de la tige embryonnaire végétative d'épicéa durant l'hiver sont décrits. En janvier, on n'observe pas de changements morphologiques ni anatomiques. On observe par contre, en l'espace de quelques jours seulement, des changements considérables au niveau cellulaire. Ceux-ci concernent avant tout les plastes (accumulation d'amidon) et les vacuoles à tanins (disparition des groupes aldéhydes libres). Ces changements peuvent être provoqués par différents facteurs dont la température paraît être le plus important. Le glucose libéré des tanins est probablement utilisé dans la synthèse d'amidon au moment de la sortie du repos hivernal.plaste / amidon / vacuole à tanins Z

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Activities of enzymes of starch metabolism in developing Norway spruce [Picea abies (L.) Karst.] needles

Egger

Hampp

1996

Trees

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Structure and development of vegetative buds, from the lower crown of Picea abies

Cited by 23 publications

References 11 publications

Annual shoot-growth in Nothofagus antarctica (G. Forster) Oersted (Nothofagaceae) from northern Patagonia

Annual shoot-growth in Nothofagus antarctica (G. Forster) Oersted (Nothofagaceae) from northern Patagonia

Mid-winter ultrastructural changes in the vegetative embryonic shoot of Norway spruce [Picea abies (L.) Karst.]

Activities of enzymes of starch metabolism in developing Norway spruce [Picea abies (L.) Karst.] needles

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