Structure and ultrastructure of Pinus halepensis primary needles

Boddi, Silvia; Bonzi, Laura Morassi; Calamassi, Roberto

doi:10.1078/0367-2530-00008

Cited by 27 publications

(19 citation statements)

References 30 publications

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“…Particularly large trait alterations occur upon juvenile‐to‐adult transition, a change called heteroblasty (Zotz, Wilhelm, & Becker, ). Heteroblastic modifications in foliage morphology are especially large in pine species (Boddi, Bonzi, & Calamassi, ; Climent, San‐Martín, Chambel, & Mutke, ; Kuusk, Niinemets, & Valladares, ; Mediavilla et al., ; Pardos, Calama, & Climent, ). Juvenile (primary) pine needles are solitary and have different cross‐sectional shape, ellipsoidal or rhomboidal, compared to adult (secondary) needles that have semi‐elliptical (two‐needled species) or sectorial (species with three or more needles in fascicles) shape (Climent, Aranda, Alonso, Pardos, & Gil, ; Kuusk et al., ).…”

Section: Introductionmentioning

confidence: 99%

“…Juvenile (primary) pine needles are solitary and have different cross‐sectional shape, ellipsoidal or rhomboidal, compared to adult (secondary) needles that have semi‐elliptical (two‐needled species) or sectorial (species with three or more needles in fascicles) shape (Climent, Aranda, Alonso, Pardos, & Gil, ; Kuusk et al., ). In addition, needle linear dimensions, thickness and width, and needle dry mass per unit area are typically lower in juvenile needles (Boddi et al., ; Kuusk et al., ; Mediavilla et al., ; Pardos et al., ).…”

Section: Introductionmentioning

confidence: 99%

“…Heteroblastic modifications in foliage morphology are especially large in pine species (Boddi, Bonzi, & Calamassi, 2002;Climent, San-Martín, Chambel, & Mutke, 2011;Kuusk, Niinemets, & Valladares, 2018b;Mediavilla et al, 2014;Pardos, Calama, & Climent, 2009 or sectorial (species with three or more needles in fascicles) shape (Climent, Aranda, Alonso, Pardos, & Gil, 2006;Kuusk et al, 2018b).…”

Section: Introductionmentioning

confidence: 99%

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Structural controls on photosynthetic capacity through juvenile‐to‐adult transition and needle ageing in Mediterranean pines

2018

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Needle photosynthetic potentials strongly vary among primary (juvenile) and secondary (adult) needles (heteroblasty) in Pinus species, but there is limited understanding of the underlying structural, diffusional and chemical controls. We studied differences in needle photosynthetic characteristics among current‐year juvenile and adult needles and among different‐aged adult needles in Mediterranean pines Pinus halepensis Mill., P. pinea L. and P. nigra J. F. Arnold subsp. salzmannii (Dunal) Franco, hypothesizing that needle anatomical modifications upon juvenile‐to‐adult transition lead to reduced photosynthetic capacity due to greater limitation of photosynthesis by mesophyll conductance and due to an increase in the share of support tissues at the expense of photosynthetic tissues. We also hypothesized that such alterations occur with needle ageing, but to a lower degree. Photosynthetic capacity per dry mass was 2.4‐ to 2.7‐fold higher in juvenile needles, and this was associated with 3.4‐ to 3.7‐fold greater mesophyll diffusion conductance, 2‐ to 2.5‐fold greater maximum carboxylase activity of Rubisco (Vcmax) and 2.2‐ to 3‐fold greater capacity for photosynthetic electron transport (Jmax). The latter differences were driven by modifications in mesophyll volume fraction and changes in the share of nitrogen between structural and photosynthetic functions. Analogous changes in photosynthetic characteristics occurred with needle ageing, but their extent was less. These results indicate that conifer foliage photosynthetic machinery undergoes a profound change from a fast return strategy in juveniles to slow return stress‐resistant strategy in adults and that this strategy shift is driven by modifications in foliage biomass investments in support and photosynthetic functions as well as by varying mesophyll diffusional controls on photosynthesis. Changes in needle morphophysiotype during tree and needle ageing need consideration in predicting changes in tree photosynthetic potentials through tree ontogeny and during and among growing seasons. A http://onlinelibrary.wiley.com/doi/10.1111/1365-2435.13087/suppinfo is available for this article.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural controls on photosynthetic capacity through juvenile‐to‐adult transition and needle ageing in Mediterranean pines

2018

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“…However, little information is available for most of the Pinus species with Mediterranean distributions: P. nigra J.F.Arnold subsp. salzmannii (Dunal) Franco (Yoshie & Sakai, 1985), P. pinaster Aiton (Yoshie & Sakai, 1985) and P. halepensis Mill (Boddi, Bonzi & Calamassi, 2002). In addition, morphological details of the leaf cuticle of P. pinea L. remain unstudied.…”

Section: Introductionmentioning

confidence: 99%

“…In this article, we report the taxonomic value of different leaf epidermal characteristics in single populations of the four Iberian Mediterranean Pinus species. Three of these taxa, which are native to south‐western Europe, have been included in previous leaf epidermal studies (Yoshie & Sakai, 1985; Boddi et al. , 2002), but P. pinea has not been examined in this way.…”

Section: Introductionmentioning

confidence: 99%

The value of leaf cuticle characteristics in the identification and classification of Iberian Mediterranean members of the genusPinus

Álvarez

García‐Amorena

Rubiales

et al. 2009

Botanical Journal of the Linnean Society

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This study reports the value of leaf cuticle characteristics in the identification and classification of Iberian Mediterranean species of the genus Pinus (P. nigra subsp. salzmannii, P. pinaster, P. pinea and P. halepensis), with the aim of using these characters to identify isolated cuticles and stomata in palynology slides. Preparations were made of the cuticles of pine needles belonging to one natural Iberian population of each of the above species. A number of epidermal morphological characteristics were then recorded with the aim of distinguishing these species from one another. The structure of the stomatal complex (the shape and arrangement of the subsidiary cells) was different in each species. The aperture of the epistomatal chamber was significantly smaller in P. pinea than in the other species examined, and the variables recorded for the thickening of the guard cells provided relationships that clearly distinguished all four taxa. The width and length of the stomata and the upper woody lamellae, the central distance between the external limits of the medial lamellae borders and the length of the stem were the most useful variables in this respect. The present results contribute to the ongoing discussion regarding the taxonomic classification of the members of Pinus, and provide valuable clues for the identification of Iberian Mediterranean pine species from small pine needle fragments or isolated stomata. After validation of the present results for multiple populations, these results could also be used to help identify fossil leaf macroremains and the scattered/ isolated stomata commonly observed in palaeopalynological samples.

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Variation in needle-trace diameter in respect of needle morphology in five conifer species

Pensa¹,

Aalto²,

Jalkanen³

2004

Trees - Structure and Function

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Needle traces have been used for revealing historical changes in needle longevity of Pinus sylvestris L. and Picea abies (L.) H. Karst. In this paper we compared the needle-trace diameter of five conifer species [Abies sibirica Ledeb., Picea abies, Pinus sylvestris, Pseudotsuga menziesii (Mirb.) Franco and Taxus baccata L.] in respect of needle size. In case of P. sylvestris, we studied how needle-trace diameter varied among different growing sites and among different shoots within a site, and related that variation to needle morphology and structure. Pinus sylvestris had the greatest diameter of needle traces (mean€SD=233 €30 mm) followed by T. baccata (141€19 mm) and P. menziesii (121€30 mm). The smallest needle-trace diameter was in A. sibirica (85€21 mm) and P. abies (80€18 mm). Among species, the needle-trace diameter was strongly correlated with needle length (r=0.93, P<0.05). Within P. sylvestris, the needle-trace diameter was significantly affected by location (P<0.001) and varied significantly among shoots within a location (P<0.001). The shoots of P. sylvestris which had greater average diameter of needle traces, tended to have longer (r=0.36, P<0.05), wider (r=0.55, P<0.05) and heavier (r=0.64, P<0.05) needles with greater stomatal density (r=0.55, P<0.05). Although our results do not allow the use of needle-trace diameter to predict properties of needle structure at the present stage, they nevertheless indicate general trends and point to a need for further studies.

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Structure and ultrastructure of Pinus halepensis primary needles

Cited by 27 publications

References 30 publications

Structural controls on photosynthetic capacity through juvenile‐to‐adult transition and needle ageing in Mediterranean pines

Structural controls on photosynthetic capacity through juvenile‐to‐adult transition and needle ageing in Mediterranean pines

The value of leaf cuticle characteristics in the identification and classification of Iberian Mediterranean members of the genusPinus

Variation in needle-trace diameter in respect of needle morphology in five conifer species

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