Leaf morphology and photosynthetic adjustments among deciduous broad-leaved trees within the vertical canopy profile

Koike, Takao; Kitao, Mitsutoshi; Maruyama, Yutaka; Mori, Shigeta; Lei, Thomas T.

doi:10.1093/treephys/21.12-13.951

Cited by 135 publications

(110 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…O aumento na concentração de clorofila por unidade de massa em plantas expostas a baixas irradiâncias é uma resposta consistentemente observada (Boardman 1977, Barrett & Fox 1994, Nicotra et al 1997. A razão entre clorofila a e b, por sua vez, foi proposta como indicadora do ambiente de luz de uma planta (Dale & Causton 1992), sendo tipicamente menor em plantas que crescem em condições de sombreamento, considerando que o papel da clorofila b é otimizar o funcionamento no fotossistema II sob baixas irradiâncias (Koike et al 2001, Nakazono et al 2001. Neste estudo, as plantas sombreadas de A. angustifolia mostraram-se plásticas em relação ao acúmulo e proporções da clorofila, diferindo dos resultados anteriormente obtidos por Duarte & Dillenburg (2000).…”

Section: Resultsunclassified

Ajustes morfológicos e fisiológicos em plantas jovens de Araucária angustifolia (Bertol.) Kuntze em resposta ao sombreamento

Franco

Dillenburg

2007

Hoehnea

View full text Add to dashboard Cite

-(Morphological and physiological adjustments in young plants of Araucaria angustifolia (Bertol.) Kuntze in response to shading). This study evaluated the ability of plants of Araucaria angustifolia in adjusting some aspects of their morphology and physiology to different light conditions. Plants were submitted to full irradiance and shaded (90% reduction) conditions. During the course of a greenhouse experiment, four harvests were made (31, 49, 75 and 158 days after planting) and growth measurements of the shoot and roots were taken. A reduction in dry mass accumulation was observed in the shaded plants. These plants also had an initial enhancement of height growth, accumulated more chlorophyll, and, by the end of the experiment, had branched less and attained a greater leaf area ratio than the control plants. These morphological and physiological changes, which exhibited a temporally discontinuous expression, were interpreted as adjustments towards a more efficient light absorption and resource conservation under shading, which may contribute to the reported hade tolerance of the species. Key words: Brazilian pine, light, shade tolerance RESUMO -(Ajustes morfológicos e fisiológicos em plantas jovens de Araucaria angustifolia (Bertol.) Kuntze em resposta ao sombreamento). Este trabalho avaliou a capacidade de plantas de Araucaria angustifolia em ajustar alguns aspectos de sua morfologia e fisiologia a diferentes condições de luz. As plantas foram submetidas a irradiação plena e sombreamento (redução de 90%). Ao longo do experimento, conduzido em casa de vegetação, foram efetuadas quatro avaliações (31, 49, 75 e 158 dias após o plantio) de crescimento na parte aérea e no sistema radicular. Uma redução no acúmulo de massa seca foi verificada nas plantas sombreadas. Estas também exibiram maior crescimento inicial em altura, acumularam mais clorofila e, ao final do experimento, haviam ramificado menos e atingido maior razão de área foliar, quando comparadas às controles. Estas alterações morfológicas e fisiológicas, cujas expressões foram temporalmente descontínuas, foram interpretadas como ajustes para uma absorção mais eficiente de luz e de economia de recursos sob condições de sombreamento, devendo contribuir para a relatada tolerância ao sombreamento da espécie. Palavras-chave: luz, pinheiro brasileiro, tolerância à sombra IntroduçãoAraucaria angustifolia (Bertol.) Kuntze (Araucariaceae), também conhecida como pinheiro brasileiro ou pinheiro-do-paraná, é uma das essências florestais mais importantes no sul do Brasil. A espécie destaca-se pela alta qualidade de sua madeira, fonte de alimento para a fauna e para o homem, como também pela exuberante beleza paisagística na região onde ocorre (Reitz & Klein 1966).A exploração irracional e descontrolada de sua valiosa madeira nos últimos 40 anos reduziu a área de ocupação da espécie, de cerca de 200.000 km 2 para aproximadamente 6.000 km 2 . Essências exóticas (em sua maioria dos gêneros Pinus e Eucalyptus) têm sido selecionadas para projetos de reflorestame...

show abstract

Section: Resultsunclassified

Ajustes morfológicos e fisiológicos em plantas jovens de Araucária angustifolia (Bertol.) Kuntze em resposta ao sombreamento

Franco

Dillenburg

2007

Hoehnea

View full text Add to dashboard Cite

show abstract

“…6A), indicating that high chlorophyll content in the old leaves of these species contributes to the light harvesting efficiency at low light availability. The ratio of chlorophyll/N acts as an indicator of the allocation of leaf nitrogen to chlorophyll-protein complexes 27,30,33 . Therefore, a negative relation between SPAD/N ratio and I c value in N. heimii and Pouteria sp.…”

Section: Leaf Ecophysiological Responses To Low Canopy Opennessmentioning

confidence: 99%

Leaf Photosynthetic and Growth Responses on Four Tropical Tree Species to Different Light Conditions in Degraded Tropical Secondary Forest, Peninsular Malaysia

Tanaka

Yoneda

Matsumoto

et al. 2008

JARQ

View full text Add to dashboard Cite

Degraded secondary forests after burning or other disturbances are widely distributed throughout Southeast Asia 62 . These secondary forests usually show significantly lower above ground biomass, species richness and various forest products such as timber and medicine compared with late successional tropical rainforests 9,10,13,39,42 .Enrichment planting in the secondary forest may be a highly effective method for rehabilitating the forest, using endemic tree species, which provides benefits including timber and medicinal products 1,29,34,35,48 . A better understanding of ecological traits such as strong light tolerance for the target species could improve techniques for enrichment planting in the secondary forest 4,26,32 . Leaf ecophysiological traits should provide valuable ecological information, since leaf photosynthesis is essential to JARQ 42 (4), 299 -306 (2008) AbstractLeaf ecophysiological responses and height growth were studied in four indigenous tree seedlings planted under different size gaps in degraded tropical secondary forest. Dyera costulata, Dipterocarpus baudii, Neobalanocarpus heimii, and Pouteria sp. were selected for study species. The leaf photosynthetic rate at light saturation (A max ), light compensation point (I c ), leaf nitrogen content, and SPAD value were measured at two months after planting. The ratio of variable to the maximum fluorescence (F v /F m ), which represents the maximal photochemical efficiency of photosystem II was also determined at two months after planting. All measurement leaves were old leaves, which had acclimated before the planting light condition. Canopy openness above the seedlings was estimated from a hemispherical photograph, ranged from 6 to 53%. The relationships between canopy openness and A max among species were categorized into two groups. The first group (N. heimii and Pouteria), which had relatively high wood density and late successional status, showed that the maximum A max appeared under relatively low canopy openness such as approximately 10%. A max of the second group (D. costulata and Dip. baudii), which had relatively low wood density and high light demand, maximized from 20 to 40% of canopy openness. Seedling height growth of the first group was lower than the second group. The first group also showed lower F v /F m at high canopy openness than the second group. These responses indicated that the first group may be categorized to less tolerant species for strong light conditions during the early transplanted stage. I c of D. costulata, N. heimii and Pouteria decreased with decreasing canopy openness. These species have high acclimation ability to shade conditions from the early transplanted stage, since these responses contribute to raise the photosynthetic efficiency under shade conditions.

show abstract

“…The correlation is independent of the source of variation in leaf N content, whether it is light (DeJong and Doyle 1985, Hirose et al 1988, Ellsworth and Reich 1993, nutrient availability (Gulmon and Chu 1981, Walters and Reich 1989, Rosati et al 1999, leaf age (Hikosaka et al 1994), or season (Reich et al 1991). Therefore, leaf N is expected to be an effective index for modeling canopy photosynthesis from a single canopy scale (Leuning et al 1991, Hollinger 1996 to a stand canopy scale (Koike et al 2001) and furthermore, to a terrestrial ecosystem scale (Schulze et al 1994).…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal variations in the photosynthesis-nitrogen relationship in a Japanese cedar (Cryptomeria japonica D. Don) canopy

Kobayashi¹,

Inoue²,

Gyokusen³

2010

Photosynt.

View full text Add to dashboard Cite

Spatial and temporal variations in light-saturated photosynthetic capacity and needle nitrogen (N) content were investigated in one 8 m tall Japanese cedar (Cryptomeria japonica D. Don) canopy for a full year. The photosynthetic capacity and needle N content in various layers of the canopy were measured every month. Temporal variations in photosynthetic capacity and needle N content expressed on a projected-area basis (P area , N area ) were similar. Furthermore, both P area and N area decreased with increasing depth from the top of the canopy on each sampling date. As a consequence, a significant correlation was observed between N area and P area . Temporal variations in photosynthetic capacity and needle N content expressed on a mass basis (P mass , N mass ) were also similar. P mass also decreased with increasing canopy depth. However, in contrast to N area , there was only a slight decrease in N mass with increasing canopy depth. Hence, the correlation between N mass and P mass was lower than the projected-area value. Because N area was highly correlated with the needle mass per projected-area (NMA), the spatial variation in N area (and therefore P area ) in the canopy is attributed to the variation in NMA, which decreases as the depth from the top of the canopy increases. Furthermore, the slope of the linear regression between N area and NMA differed between sampling dates, indicating that the temporal variations in N area (and therefore P area ) are strongly influenced by N mass . For most of the sampling dates, a linear regression between N area and P area tends to converge into a single line segment. However, on several sampling dates, there was a pronounced decline in P area below this line segment. This reduction in P area , which does not accompany a reduction in N area , seems to be attributable to stomatal limitations induced by the low soil temperature in winter and early spring.

show abstract

Leaf morphology and photosynthetic adjustments among deciduous broad-leaved trees within the vertical canopy profile

Cited by 135 publications

References 43 publications

Ajustes morfológicos e fisiológicos em plantas jovens de Araucária angustifolia (Bertol.) Kuntze em resposta ao sombreamento

Ajustes morfológicos e fisiológicos em plantas jovens de Araucária angustifolia (Bertol.) Kuntze em resposta ao sombreamento

Leaf Photosynthetic and Growth Responses on Four Tropical Tree Species to Different Light Conditions in Degraded Tropical Secondary Forest, Peninsular Malaysia

Spatial and temporal variations in the photosynthesis-nitrogen relationship in a Japanese cedar (Cryptomeria japonica D. Don) canopy

Contact Info

Product

Resources

About