BIANCHINI, E.

BOTOSSO, P. C.

MEDRI, M. E.

NASCIMENTO, M. B. F.

SUZUKAWA, H. T.

RCAAP - Repositório Científico de Acesso Aberto de Portugal

Wood anatomical features of growth rings of tree species from semi-deciduous forest in Southern Brazil.

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MARCELA B. F. NASCIMENTO I , HELENA T. SUZUKAWA1, PAULO C. BOTOSS02,EDIMILSON BIANCHINI1, and MOACYR E. l\1EDRI1: 'Laboratório de Anatomia Vegetal,Departamento de Biologia Animal e Vegetal, Universidade Estadual de Londrina, Londrina, PR, Brazil,mablagitztâgrnail.com, tiemi_imeit @yahoo.com.br, bianehini@ueLbr, moacyrrnedri @ueLbr::'Embrapa Florestas, Colombo, PR. Brazil, botosso@enpf.embrapa.br - Wood anatomical features ofgrowth rings of tree species from semi-deciduous forest in southern BrazilGrowth rings are formed due to the dynarnics of cambial activity which can be influenced by abiotic andbiotic factors and by the genotypc of individuaIs. Basic studies that describc thcsc wood structurcs areesscntials and of great interest to dendrochronology, climatology, forest rnanagernent, conservation andrestoration. In this way, the goal of this study was to verify the occurrence and eharacterizernacroscopically and microscopically growth ring markers in tree species naturally occurring in serni-deciduous forest belonging to the Atlantic Rain Forest biome. The study site was Godoy Forest StatePark a remnant forest siruated in the north 01' Paraná State (23°27'S; 5JolS'W). The region ischaracterized by seasonal clirnate changes with a hot-humid season (October-March, rainfall exceeding200mm) and a cooler-dry season (April-September, rainfall Jess than 70mm). Wood sampJes werecollected using a Pressler borer. Cross wood sections were polished and analyzed under astereomicroscope. For microscopic analyses, a sliding microtome was used, sections were stained withastra blue and basie fucsine. Analyses were made following IAWA Committee instructions. Alchorneaglandulosa, Alchornea triplinervea. Chrysophyllum gonocarpum and Croton floribundus presentedfibers with rhicker walls in latewood. Aspidosperma polyneuron. Cabralea canjerana. Prunus sellowiiand Trichilia claussenii had marginal bands of axial parenchyma associated with thick walled fibers.Ccdrela fissilis had marginal band ofaxial parenchyma and changes in vessel diarneter, forrning serni-porous ring. Tree species that showed better dístinction in the growth rings were deciduous or serni-deciduous: Alchornea glandulosa, Alchomea triplinervea, Aspidospenna polyneuron. Cedrela fissilis62and Cltrysophyllum gonocarpum. However the evergreen tree species Cabralea canjeraua, Prunussellowii and Trichilia claussenii have slightly distinct growth rings. In this study it is apparent that thepattern of falI leaves is related to the degree of differentiation of the growth rings, although variations ininformation about environmental conditions or genotype should not be discarded.63

http://www.alice.cnptia.embrapa.br/alice/bitstream/doc/946215/1/IAWAWoodanatomical.pdf

Wood anatomical features of growth rings of tree species from semi-deciduous forest in Southern Brazil.

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RCAAP - Repositório Científico de Acesso Aberto de Portugal

Repository Open Access to Scientific Information from Embrapa