GRUPO DE CONJUNTURA ECONÔMICA 3º PAINEL CONJUNTURAL DEZEMBRO DE 2013.
Painel SachaACS Meetings 2013 (2)
1
RESULTS Figure 1. Germination (A), first count of germination (B), speed of germination index (C), mean time for seed germination (D) of P. volubilis at temperatures 20, 25, 30 and 35 ° C. CONCLUSIONS It was verified the temperature of 30 °C to be the optimum one since it permitted maximum germination of P. volubilis seeds in the shortest period of time (10 days). The temperatures of 20 °C and 40 °C were, respectively, the minimum and the maximum, since below the lower and above the higher seed germination no longer took place. INTRODUCTION Plukenetia volubilis L. is a species native to the Amazon region. Its seeds have a high content of mono and polyunsaturated fatty acids which have been found to be important for medicinal and aesthetic purposes. Knowing aspects of its ecophysiological characteristics is of strategic importance for a more efficient management of the production of plantlets of this species. OBJECTIVE The objective of this study was to evaluate how temperature affects the germination process of seeds of this species. MATERIALS AND METHODS The seeds were collected from 25 matrix plants in the germplasm bank of the Eastern Amazon Embrapa, located in Manaus, Amazon state, Brazil. Seed germination was evaluated by a test in which four 20 seed replications were sown in rolls of wet paper towel and, at an eight hours regime of light, were submitted to the following temperatures: 10, 15, 20, 25, 30, 35, 40, and 45 °C. The normal seedlings were counted at each two days from 9 to 61 days after the beginning of the test. The last count was determined by the moment the seeds no longer germinated in most of the treatments. First count of germination, germination, the speed of germination index, and the mean time for seed germination were determined. The results were submitted to the analysis of variance by the F test (p < 0.05) and the means were adjusted to polynomial regression models which presented biological explanation, normality and high R 2 . João Eduardo Brandão Boneti 1 , Renato Teo Barros 1 , Lilan Faria de Melo 1 , Maria Teresa Gomes Lopes 2 , Cibele Chalita Martins 1 1 UNESP – Univ Estadual Paulista, Department of Crop Science, 14884-900, Jaboticabal, SP, Brazil 2 UFAM – Univ Federal Amazonas, Department of Animal an Plant Production, 69077-000, Manaus, AM, Brazil E-mail: [email protected] Câmpus de Jaboticabal Temperature effects on the germination of Plukenetia volubilis L. seeds ŷ = 842.500 – 121.792x + 5.550x 2 – 0.783x³ R² = 1.000 0 20 40 60 80 100 20 25 30 35 First count of germination (%) Temperature (°C) ŷ = - 161.500 + 20.975x – 0.4250x 2 R² = 0.936 0 20 40 60 80 100 20 25 30 35 Germination (%) Temperature (°C) ŷ = -7.225- 1.108x + 0.058x² - 0.001x³ R² = 1.000 0 0,5 1 1,5 2 20 25 30 35 Speed of germination index Temperature (°C) ŷ = 79.818 – 4.725x + 0.080x ² R² = 0.994 0 5 10 15 20 20 25 30 35 Mean time for seed germination (days) Temperature (°C) A B C D
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Transcript of Painel SachaACS Meetings 2013 (2)
RESULTS
Figure 1. Germination (A), first count of germination (B), speed of germination index
(C), mean time for seed germination (D) of P. volubilis at temperatures 20, 25, 30 and
35 ° C.
CONCLUSIONS
It was verified the temperature of 30 °C to be the optimum one since it
permitted maximum germination of P. volubilis seeds in the shortest period
of time (10 days). The temperatures of 20 °C and 40 °C were, respectively,
the minimum and the maximum, since below the lower and above the
higher seed germination no longer took place.
INTRODUCTION
Plukenetia volubilis L. is a species native to the Amazon region. Its
seeds have a high content of mono and polyunsaturated fatty acids which
have been found to be important for medicinal and aesthetic purposes.
Knowing aspects of its ecophysiological characteristics is of strategic
importance for a more efficient management of the production of plantlets
of this species.
OBJECTIVE
The objective of this study was to evaluate how temperature affects
the germination process of seeds of this species.
MATERIALS AND METHODS
The seeds were collected from 25 matrix plants in the germplasm
bank of the Eastern Amazon Embrapa, located in Manaus, Amazon state,
Brazil.
Seed germination was evaluated by a test in which four 20 seed
replications were sown in rolls of wet paper towel and, at an eight hours
regime of light, were submitted to the following temperatures: 10, 15, 20,
25, 30, 35, 40, and 45 °C. The normal seedlings were counted at each
two days from 9 to 61 days after the beginning of the test. The last count
was determined by the moment the seeds no longer germinated in most
of the treatments. First count of germination, germination, the speed of
germination index, and the mean time for seed germination were
determined.
The results were submitted to the analysis of variance by the F test (p
< 0.05) and the means were adjusted to polynomial regression models
which presented biological explanation, normality and high R2.
João Eduardo Brandão Boneti1, Renato Teo Barros1, Lilan Faria de Melo1, Maria Teresa Gomes Lopes2, Cibele Chalita Martins1
1UNESP – Univ Estadual Paulista, Department of Crop Science, 14884-900, Jaboticabal, SP, Brazil
2UFAM – Univ Federal Amazonas, Department of Animal an Plant Production, 69077-000, Manaus, AM, Brazil
E-mail: [email protected]
Câmpus de Jaboticabal
Temperature effects on the germination of Plukenetia volubilis L. seeds
ŷ = 842.500 – 121.792x + 5.550x2 – 0.783x³ R² = 1.000
0
20
40
60
80
100
20 25 30 35
First co
un
t of
ge
rmin
ation
(%
)
Temperature (°C)
ŷ = - 161.500 + 20.975x – 0.4250x2 R² = 0.936
0
20
40
60
80
100
20 25 30 35
Germ
ina
tio
n (
%)
Temperature (°C)
ŷ = -7.225- 1.108x + 0.058x² - 0.001x³ R² = 1.000
0
0,5
1
1,5
2
20 25 30 35
Spee
d o
f ge
rmin
ation
in
de
x
Temperature (°C)
ŷ = 79.818 – 4.725x + 0.080x² R² = 0.994
0
5
10
15
20
20 25 30 35
Me
an
tim
e f
or
se
ed
g
erm
ina
tio
n (
da
ys)
Temperature (°C)
A
B
C
D
