Physiological Response to High Light in Cymbidium tracyanum and C.sinense

doi:10.7677/ynzwyj201514046

Abstract

Abstract:

The members of the genus Cymbidium are important ornamental flowers. Most species of this genus prefer to grow on the shady places of the forest floor, while epiphytic Ctracyanum can grow well in the presence of direct sunlight. To explore the physiological mechanism underlying the adaptation of Ctracyanum to high light, we used terrestrial Csinense as the control, and measured the chlorophyll fluorescence and P700 redox state in those two species grown at two different light regimes. Our results showed that the activities of photosystem I and II in Csinense under high light decreased more strongly than those in Ctracyanum. The activation of cyclic electron flow (CEF) in Ctracyanum under high light could serve as a main mechanism of photoprotection. However, the weak of CEF in Csinense limited its adaptation to high light. Since epiphytic habitats may suffer more intermittent direct sunlight than understory, the strong adaptability of Ctracyanum to high light may contribute to its utilization of light energy in epiphytic habitats.

Key words: Cymbidium, Photosynthetic characteristics, Cyclic electron flow, Chlorophyll fluorescence, Light intensity

CLC Number:

Q 945

KUANG Mei-Ling, ZHANG Shi-Bao. Physiological Response to High Light in Cymbidium tracyanum and C.sinense[J]. Plant Diversity, 2015, 37(01): 55-62.

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