TY - JOUR

T1 - Optimal temperature for germination of Zephyra compacta (Tecophilaeaceae)

AU - De la Cuadra, Carlos

AU - Vidal, Alexis K.

AU - Mansur, Leví M.

N1 - Publisher Copyright:
© 2017, American Society for Horticultural Science. All rights reserved.

PY - 2017/3

Y1 - 2017/3

N2 - Zephyra compacta is a geophyte plant endemic to Chile with the potential to be used as an ornamental crop. Its natural habitat is the coastal plains of the Atacama Desert, with a climate described as coastal desert with abundant cloudiness. This work analyzes the germination of Z. compacta seeds at 10, 15, 20, and 25 °C. Seeds were collected in 2011 and stored for 2 years and 4 months at 5 °C, until sowing. A mathematical model was used for germination analysis, p = A{1 − exp[−k(t − t0)]}, where p is the germination percentage at a certain time t, A is the final germination percentage, t0 is the estimated time of germination of the first seed, and k is the measure of the spread of the time to germination. Furthermore, the rate of germination of the median seed to germinate (1/tA/2) was included. The germination curves showed a coefficient of determination (R2) between 0.86 and 0.99. The results show that temperature range for germination is from 10 to 20 °C, where A is over 90%. In this range, other evaluated parameters (t0, k, and 1/tA/2) show no significant difference, with the exception of k at 15 °C. At this temperature, germination is obtained in a shorter period of time and could be considered as the optimal temperature within the range. Finally, 25 °C is a supraoptimal temperature, where the value of A decreased to 30%.

AB - Zephyra compacta is a geophyte plant endemic to Chile with the potential to be used as an ornamental crop. Its natural habitat is the coastal plains of the Atacama Desert, with a climate described as coastal desert with abundant cloudiness. This work analyzes the germination of Z. compacta seeds at 10, 15, 20, and 25 °C. Seeds were collected in 2011 and stored for 2 years and 4 months at 5 °C, until sowing. A mathematical model was used for germination analysis, p = A{1 − exp[−k(t − t0)]}, where p is the germination percentage at a certain time t, A is the final germination percentage, t0 is the estimated time of germination of the first seed, and k is the measure of the spread of the time to germination. Furthermore, the rate of germination of the median seed to germinate (1/tA/2) was included. The germination curves showed a coefficient of determination (R2) between 0.86 and 0.99. The results show that temperature range for germination is from 10 to 20 °C, where A is over 90%. In this range, other evaluated parameters (t0, k, and 1/tA/2) show no significant difference, with the exception of k at 15 °C. At this temperature, germination is obtained in a shorter period of time and could be considered as the optimal temperature within the range. Finally, 25 °C is a supraoptimal temperature, where the value of A decreased to 30%.

KW - Atacama Desert

KW - Coastal desert with abundant cloudiness

KW - Geophyte

KW - Seed germination

UR - http://www.scopus.com/inward/record.url?scp=85019213157&partnerID=8YFLogxK

U2 - 10.21273/HORTSCI11623-16

DO - 10.21273/HORTSCI11623-16

M3 - Article

AN - SCOPUS:85019213157

VL - 52

SP - 432

EP - 435

JO - HortScience

JF - HortScience

SN - 0018-5345

IS - 3

ER -