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Paper Information

Journal:   JOURNAL OF PLANT PRODUCTION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)   2017 , Volume 24 , Number 3 ; Page(s) 45 To 54.
 
Paper: 

EFFECT OF TEMPERATURE, HUMIDITY, AND BULB'S REST PERIOD DURATION ON VEGETATIVE AND REPRODUCTIVE GROWTH IN TUBEROSE (POLIANTHES TUBEROSA L.)

 
 
Author(s):  LADAN MOGHADDAM A.R.*
 
* GARDENING DEPARTMENT, GARMSAR BRANCH, ISLAMIC AZAD UNIVERSITY, GARMSAR, IRAN
 
Abstract: 

Background and objectives: Storage condition in the bulb's rest period may in fluence 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 suitable 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 as factorial with 3 temperatures (15, 20, and 25
°C), 2 humidity levels (50 and 75%), and 2 rest period (4 and 8 weeks) which was conducted in adaption to randomized complete blocks design with four relicating on the tuberose double cultivar in 2015. Indicators of vegetative and reproductive growth includ 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. 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 traits 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 4 weeks treatment.
Conclusion: The temperature of 25
°C with 75% humidity lasting for 8 weeks provided better condition for acceleration of germination and flowering. Therefore increase of vegetative and reproductive growth its proposed for tuberose bulbs storage.

 
Keyword(s): DOUBLE CULTIVAR, FLOWERING, GERMINATION, HUMIDITY, TEMPERATURE
 
References: 
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