Study on Test Materials with the Relationship between Growth and Development Characteristics and Temperature and Relative Humidity of <i>Jacaranda mimosifolia</i>

Abstract

Jacaranda mimosifolia of 55-year-old in Sichuan Neijiang was selected as test material. Through the observation of its growth and development by 2011 and the analysis of temperature and relative humidity, this study discussed its basic law of growth and development and the relationship between temperature and RH factor. By analysis of variance, there was no significant difference in monthly average temperature and RH between 2011 and the climate in Neijiang, the temperature and RH of 2011 could reflect the situation of Neijiang regional climatic. The results showed that the average annual growth of J. mimosifolia new shoot was 32.4cm and the average thickness was 11.2mm, and appeared thrice sprouting and twice flowering phenomenon per year. Combined the characteristics of growth and development of J. mimosifolia, the length and thickness of spring shoot, summer shoot and autumn shoot were both extremely different (P&lt;0.01), and two florescence appeared in Spring and Autumn when the temperature was not different significantly. Therefore, temperature played an apparently predominant role in its growth and development.

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“…terebinthifolius, J. mimosifolia produced a greater number of flowers and fruits under outdoor conditions, confirming the preference of the species for mild temperatures (Carón et al 2018). J. mimosifolia trees bloom when the temperature is between 20 and 30 °C and the relative humidity is about 70% (Sun et al 2013). The lack of fruiting in J. mimosifoliagrown in the greenhouse may be due to late-acting self-incompatibility.…”

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“…However, little is known about its reproduction and seed dispersal. Experiments and short-term observations [22,37,39,40] suggest that temperature is a key factor influencing germination and flowering in this species with one showing that Jacaranda mimosifolia flowering is triggered by prolonged cold exposure (i.e. 15˚C for a minimum of three months) [22].…”