Effect of Temperature, Humidity, and Bulb’s Rest Period Duration on Vegetative and Reproductive Growth in Tuberose (Polianthes tuberosa L.)

Document Type : original paper

Author

Gardening Department, Garmsar Branch, Islamic Azad University, Garmsar, Iran

Abstract

Background and objectives: Storage condition in the bulb’s rest period may influence on vegetative and reproductive growth of plant. Results of previous studies show that temperature between 20 to 25°C lasting for 4 to 8 weeks are proper condition for storage of tuberose bulbs (Polianthes tuberosa L.), but there is no comprehensive information available regarding proper level of humidity and its interaction effect with temperature and bulb’s rest period duration. Based on this, the aim of current study was allocated to determine the effect of temperature, humidity, and bulb’s rest period duration on vegetative and reproductive growth in tuberose.

Materials and methods: Design of the study was three factorial 3 temperature (15, 20, and 25°C), 2 humidity (50 and 75%), and 2 rest period (4 and 8 weeks) which was conducted in adaption to randomized complete block design with four repetitions on the tuberose double cultivar in 2015, and indicators of vegetative and reproductive growth including time of germination, spike emergence, first floret, and harvest, germination percentage, leaf numbers, numbers, diameter, and length of inflorescence spike, numbers and diameter of floret and inflorescence length were measured. Resulted data were analyzed using factorial analysis of variance (ANOVA) and Duncan's multiple rang test.

Results: The results of current study showed that the main effect of temperature on all indicators of vegetative and reproductive growth including time of germination, spike emergence, first floret, and harvest, germination percentage, leaf numbers, numbers, diameter, and length of inflorescence spike, numbers and diameter of floret and inflorescence length is statistically significant, but the main effect of humidity only on numbers and diameter of inflorescence spike, and main effect of rest period on time of germination, germination percentage, leaf numbers, numbers, diameter, and length of inflorescence spike, diameter of first floret and inflorescence length are statistically significant. Also, interaction effects of temperature, humidity, and bulb’s rest period duration on all indicators of vegetative and reproductive growth were statistically significant. Follow-up tests showed that indicators of the vegetative and reproductive growth in the treatment of 25°C temperature with 75% humidity lasting for 4 and 8 weeks compared to other treatments are placed in better levels, but 8 weeks treatment creates better general condition compared to 8 weeks treatment.

Conclusion: The temperature of 25°C with 75% humidity lasting for 8 weeks creates better condition for acceleration of germination and flowering, and for increase of vegetative and reproductive growth which is proposed for tuberose bulbs storage.

Keywords

Main Subjects

References

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Journal of Plant Production Research
Volume 24, Issue 3
January 2018
Pages 47-56

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