Effects of light and low temperature on the reciprocal style curvature of Flexistylous Alpinia Species (Zingiberaceae) |
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Authors: | Yin-Ling Luo and Qing-Jun Li |
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Institution: | (1) Key Lab of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, The Chinese Academy of Sciences, Yunnan, 666303, China;(2) Graduate University of Chinese Academy of Sciences, Beijing, 100039, China; |
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Abstract: | The style curvature (flexistyly) of Alpinia species in ginger family is a unique plant organ movement because the style of each flower curves twice during its 1-day
anthesis and styles of two phenotypes of each Alpinia species in the same population synchronously curve in opposite directions at the same time. In this study, we investigated
the effects of low temperature and light conditions on these reciprocal style movements. Our results indicate that low temperature
cannot change the direction of each curvature movement, but can slow down these movements and decrease the curve degrees.
Light did not affect the upward curvature of the cataflexistylous morph, but the degrees of downward curvature decreased in
darkness. For the anaflexistylous morph, the downward curvature only occurred in darkness, but curved directly upward in light
condition; after the first (downward) curvature, the second (upward) movement only occurred in light, but did not occur if
styles maintained in darkness. These results suggest that low temperature does not stimulate style curvature; light is the
necessary condition for the upward movement of the anaflexistylous morph. The stimuli that induced curvature movements in
the two morphs were different. Both two curvatures of the cataflexistylous style and downward movement of the anaflexistylous
style were controlled via an endogenous program, while the upward movement of the anaflexistylous style was controlled by
light. |
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Keywords: | |
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