Effects of Light Environment in Artificial Community on Growth andOrnamental Quality of Clerodendron trichotomum

doi:10.11924/j.issn.1000-6850.casb16020082

Abstract

Abstract: In artificial cultivation community, the effects of different light intensities on growth characteristics and ornamental quality of Clerodendron trichotomum were studied. The growth index and ornamental quality of Clerodendrum trichotomum were measured using common measuring methods, and the photosynthesis was tested with TPS-2 portable Photosynthetic apparatus. By optical microscope (Olympus CX-31) ×40 times, the photographs of the stomatal characteristics were taken with digital microscopic imaging system (DP-20 Olympus) camera, calibrated by digital distance software Motic Images Advanced 3.0. The results showed that with light intensity decreased, the leaf size decreased in different degrees, but the specific leaf area increased. Dry weight/ fresh weight decreased, while the relative content of chlorophyll increased first and then decreased, and reached the maximum under 81% sunlight. The net photosynthetic rate, transpiration rate and stomatal conductance decreased, but the intercellular CO₂ concentration increased. Stomatal size and stomatal density decreased, the stomatal opening increased first and then decreased, and reached the maximum under 81% sunlight. Ornamental quality was also very different: under 81% sunlight, the initial stage of floret, initial flowering stage and the full bloom stage were advanced, and the inflorescence length reached the maximum. With the decrease of light intensity to less than 44% sunlight, the flowering period was significantly delayed, and the ornamental time was shortened. The diameter of inflorescence, the floret number of single inflorescence, the total number of inflorescences and the length of inflorescence were significantly reduced. Consequently, the study illustrated that appropriate shading was conducive to promote the growth and the ornamental quality of Clerodendrum trichotomum, but adverse effects would appear if the shading exceeded a certain degree.

Liu Xueli,Chen Yue,Wu Ruining and Sun Xianzhi. Effects of Light Environment in Artificial Community on Growth andOrnamental Quality of Clerodendron trichotomum[J]. Chinese Agricultural Science Bulletin, 2016, 32(28): 90-96.

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