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ACTA HORTICULTURAE SINICA ›› 2020, Vol. 47 ›› Issue (7): 1401-1411.doi: 10.16420/j.issn.0513-353x.2019-0388

• Research Notes • Previous Articles     Next Articles

Effects of Epicuticular Waxes on the Physiological Characteristics of Blue- leaf Hosta

SHAO Meini1,HAO Xin2,CUI Na1,QU Bo1,GUAN Ping1,JIA Weikang1,and XU Yufeng1,*   

  1. 1College of Biological Science and Technology,Shenyang Agricultural University,Shenyang 110866,China;2College of Forestry,Shenyang Agricultural University,Shenyang 110866,China
  • Online:2020-07-25 Published:2020-07-25

Abstract: In order to explore the role of epicuticular waxes on the leaf epidermis of shade plants blue-leaf Hosta in photosynthetic adaptability,Hosta‘Halcyon’and Hosta‘Baby Bunting’,two members of blue-leaf type,were grown in pots under natural lighting. Diurnal variation of photosynthesis,chlorophyll content,chlorophyll fluorescence parameters,relative conductivity and MDA content of epicuticular waxes-covered leaves and epicuticular waxes-wiped leaves were measured in 0,7,14 d,respectively. The results showed that the net photosynthetic rate,water use efficiency and maximum photochemical efficiency of leaves with intact wax were higher than those of wiped leaves,and the transpiration rate of leaves with intact wax was lower than that of wiped leaves. The net photosynthetic rate of‘Halcyon’arrived peaks at 8:00 and 16:00 respectively,but‘Baby Bunting’arrived peaks at 10:00 and 14:00 respectively. The‘Baby bunting’was more adapted to strong light than‘Halcyon’ according to the time when the net photosynthetic rate arrived to two peaks. The temperature of leaves with intact wax was higher than that of wiped leaves under conditions of strong illumination intensity. With the extension of treatment time,relative conductivity and MDA content of different treatment Hosta leaves increased and arrived to maximum at 7 d and decreased significantly. Under strong illumination intensity,epicuticular waxes on the leaf epidermis contributed to reduce the light inhibition,and the temperature or the water loss by transpiration.

Key words: blue-leaf Hosta, leaf, epicuticular waxes, physiological characteristic, diurnal variation of photosynthesis

CLC Number: