Effects of Low Temperature on Vegetative Growth, Reproductive Growth and ChlorophyⅡ Fluorescence Parameter in Phalaenopsis Orchids

doi:10.11924/j.issn.1000-6850.2014-0639

Abstract

Abstract: To study the influence of temperature on the vegetative growth and reproductive growth of moth orchid (Phalaenopsis amabilis) cultivars, 3 cultivars were tested, by setting different temperature treatments to measure the growth and chlorophyⅡfluorescence parameter changes in leaf and percent flower stalks bored. The study indicated that: (1) The floral differentiation of moth orchid needed the vernalization and the flower bud initiation of the three cultivars started within one month if the temperature was 26/18℃(day/night). Control group with 29/21℃(day/ night) treatment did not shoot the flower stalk. (2) Moreover, the reproductive growth inhibited the vegetative growth, and the average length of ripe leaves of the 3 cultivars was all less than the control group. (3) The low temperature treatment could lead to the decreasing of levels of Fv/Fm, and the increasing of levels of Fo. ChlorophyⅡfluorescence parameters could reflect sensitively the changes of photosynthetic apparatus caused by low temperature. Fv/Fm and Fo could be the indicators testing the flower differentiation rapidly.

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