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PHENOLOGY, MORPHOLOGY AND ANALYSIS OF SEEDS OF Cordia trichotoma (Vell.) Arr\ue1b. ex Steud.
Full text linkNo presente trabalho se estudou a fenologia e morfologia, como
tamb\ue9m foram realizados testes f\uedsicos e fisiol\uf3gicos
com sementes de Cordia trichotoma (Vell.) Arr\ue1b. ex Steud
(louro-pardo). A coleta do material bot\ue2nico e as
observa\ue7\uf5es fenol\uf3gicas foram realizadas em cinco
\ue1rvores matrizes, localizadas no Munic\uedpio de Frederico
Westphalen, Rio Grande do Sul, de mar\ue7o de 2007 a mar\ue7o de
2010. O trabalho foi conduzido em condi\ue7\uf5es de
laborat\uf3rio e viveiro, na Universidade Federal de Santa Maria, Rio
Grande do Sul. Durante os tr\ueas anos, a flora\ue7\ue3o teve
maior intensidade de mar\ue7o a abril e a frutifica\ue7\ue3o, de
maio a junho. A esp\ue9cie possui infloresc\ueancia cimosa,
paniculada, constitu\uedda de pequenas flores de colora\ue7\ue3o
branca, hermafroditas. O fruto \ue9 simples, drup\ue1ceo, encerrado
pelo tubo da corola e pelo c\ue1lice persistente. A semente, de
formato cil\uedndrico, elipsoidal, de colora\ue7\ue3o castanha,
exalbuminosa, com embri\ue3o cotiledonar, basal, invaginado e
cotil\ue9dones plicados, presos em torno do eixo hipoc\uf3tilo
radicular. A germina\ue7\ue3o \ue9 ep\uedgea e a pl\ue2ntula
fanerocotiledonar. As sementes s\ue3o recalcitrantes e o n\ufamero
m\ue9dio por quilograma foi de 24.591, a umidade das sementes 51 %, a
germina\ue7\ue3o 40 % e a emerg\ueancia 29 %. O \uedndice
germinativo \ue9 oscilante comparando os resultados deste trabalho a
outros, provavelmente devido \ue0 qualidade das sementes,
vari\ue1vel em fun\ue7\ue3o de cada \ue1rvore matriz e seu
micro-habitat. Portanto, h\ue1 import\ue2ncia em selecionar
indiv\uedduos, observando caracter\uedsticas que trar\ue3o
representa\ue7\ue3o gen\ue9tica e fisiol\uf3gica da
esp\ue9cie, aumentando, assim, a homogeneidade do lote de sementes.On this paper, the phenology and morphology as well as physical and
physiological tests were carried out with seeds of Cordia trichotoma
(Vell.) Arr\ue1b. ex Steud. The collection of botanical material and
phenological observations were performed on five selected trees located
in Frederico Westphalen, Rio Grande do Sul state, from March 2007 to
March 2010. The work was conducted under laboratory and greenhouse
conditions at the Universidade Federal de Santa Maria, Rio Grande do
Sul state. For three years, the bloom was most intense from March to
April and the fruiting from May to June. The species has inflorescence,
paniculate, consisting of small white colored and hermaphrodite
flowers. The fruit is simple, drupaceous, terminated by the corolla
tube and by the persistent calyx. The seed is cylindrical, ellipsoidal,
pale brown exalbuminous, cotyledonary embryo with baseline, and
invaginated plicate cotyledons, trapped around the root hypocotyl axis.
The germination is epigeal and the seedling phanerocotyledonal. Seeds
are recalcitrant and the average number was 24,591 per kilogram, the
seed moisture content was 51 %, the germination was 40 % and the
emergence was 29 %. The germination index is oscillating comparing the
results of this paper to others, probably due to seed quality, which
varies according to each parent tree and its micro-habitat. Therefore,
there is importance in the selection of individuals, noticing the
features that will bring genetic and physiological representation of
the species, thus increasing the homogeneity of the seed lot