LOGISTIC FUNCTION-ANALYSIS OF GERMINATION BEHAVIOR OF AGED FENNEL SEEDS

被引:36
|
作者
TORRES, M
FRUTOS, G
机构
[1] Departmento de Biologiá Vegetal II (Lab. Fisiología Vegetal) Facultad de Farmacia, Universidad Complutense
[2] Departamento de Química Física Farmacéutica (Lab. Matemáticas), Facultad de Farmacia, Universidad Complutense
关键词
ageing; factor analysis; Fennel; germination behaviour; logistic function;
D O I
10.1016/0098-8472(90)90051-5
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Fennel seeds (Foeniculum vulgare Mill. cv. amargo) collected from cultivated plants grown in experimental fields were germinated in darkness at 20, 25 and 30°C after 1, 3 and 5 years of seed storage at room temperature. Logistic function G = A[1 + exp (β - kt)]-1 was used to analyse cumulative germination curves over time. In addition to determining the function parameters (A, β and k), other derived quantities including germination percentage at the point of inflexion (A/2), time to reach 50% of final germination (β/k), maximum germination rate (Ak/4), onset of germination (Gt10) and mean cumulative relative germination rate (k/2) were also calculated. Through the use of these variables, the behaviour of aged fennel seeds was studied in terms of their germination success. The most relevant aspects were: (1) the main source of variation was the age of seeds; (2) the onset of germination was highly dependent on age of seeds; and (3) there was no significant influence of germination temperature on A. Statistical differences were found between younger and older seeds for A, Gt10, β/k and Ak/4. There were no significant differences between older seeds for all germination variables considered. Statistical differences were also found between seeds germinated at 20 and 30°C for both Gt10 and β/k, and between seeds germinated at 25 and 30°C for both Ak/4 and k/2. In addition to this biometric evaluation, a factor analysis by principal components method was performed. The first component is more correlated with Gt10, β/k and A, and may be interpreted as a "temporal factor". However, the second component is more correlated with k/2, Ak/4 and β, and may be partially interpreted as an "environmental factor". © 1990.
引用
收藏
页码:383 / 390
页数:8
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