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Bulletin of Botanical Research ›› 2013, Vol. 33 ›› Issue (6): 676-683.doi: 10.7525/j.issn.1673-5102.2013.06.007

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Photosynthesis and Photorotection in Amorphophallus konjac and Amorphophallus xiei Grown at a Light Gradient

HAN Yu;;LIU Shi-Shan;;LIANG Yan-Li;;ZHAO Qing-Yun;LI Jian;XU Wen-Guo;YAN Dui;WU Shi-Bin;YAN Suo;LIU Chun;XIE Shi-Qing;CHEN Jun-Wen;*   

  1. 1.Yunnan Research Center on Good Agricultural Practice for Dminant Chinese Medicinal Materials,Yunnan Agricultural University,Kunming 650201;2.Institute of Konjanc,Yunnan Agricultural University,Kunming 650201;3.College of Agronomy and Biotechnology,Yunnan Agricultural University,Kunming 650201;4. Manager of Seed of Xishuangbanna State,Jinghong 666100;5. Extension Center of Agricultural Technology of Dehong State,Mangshi 678400
  • Received:1900-01-01 Revised:1900-01-01 Online:2013-11-20 Published:2013-11-20
  • Contact: CHEN Jun-Wen
  • Supported by:

Abstract: To examine photosynthetic characteristics and photoprotection in Amorphophallus konjac K.Coch (AK), which is a shade-tolerant species but can grow under high light, and A.xiei H.Li & Z.L.Dao (AX), which is a shade-demanding species and can not tolerate high light, the photosynthetic capacity, antioxidant enzymes, antioxidant metabolites and photosynthetic pigments were analyzed in these two species grown under 100%, 15%, and 2.0% of full sunlight. Maximum photosynthetic rate (Amax) and stomatal conductance in AK decreased with decreasing light levels (P<0.05); however, Amax in AX reached a maximum value under 15% of full sunlight. In most cases, the activities of SOD, APX, CAT and GR were higher in AK (P<0.05); correspondingly, the activity of POD was higher in AX (P<0.05). Moreover, the activities of antioxidant enzyme were higher under high and moderate lights than under low light (P<0.05). Under 15% of full sunlight, the higher contents of glutathione and ascorbic acid were observed in AK. The content of photosynthetic pigments in AX reached a maximum value under 15% of full sunlight and that in AK a minimum value under 2.0% of full sunlight (P<0.05). In addition, the contents of photosynthetic pigments were generally higher in AK than AX under a light gradient (P<0.01). The results obtained here suggest that the tolerance of AK to high light might be related to the high photosynthetic capacity and the efficient photoprotection.

Key words: Amorphophallus konjac, Amorphophallus xiei, photosynthetic characteristics, photoprotection, shade-demanding species

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