Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (5): 1005-1014.DOI: 10.3969/j.issn.1004-1524.2022.05.15

• Horticultural Science • Previous Articles     Next Articles

Effects of root-zone temperature on growth, development and flowering of Hemerocallis fulva

ZHANG Zhiguo1(), CONG Lin1, ZHANG Shijie1, LI Rongguang1, ZOU Weina1, CHI Fa'an2, ZHANG Bao2, JIANG Yuping1,*()   

  1. 1. College of Ecological Technology and Engineering, Shanghai Institute of Technology, Shanghai 201418, China
    2. Weihai Yongda Green Technology Co., Ltd.,Weihai 264200, Shandong, China
  • Received:2021-11-24 Online:2022-05-25 Published:2022-06-06
  • Contact: JIANG Yuping

Abstract:

To elucidate effects of different root zone temperature on growth, development and flowering of Hemerocallis fulva, Hemerocallis fulva cv. Free Wheelin and Hemerocallis fulva cv.Big City Eye were used as the materials, four different treatments[T15(15±1) ℃/(15±1) ℃(day/night), T20(20±1) ℃/(15±1) ℃(day/night), CK1 and CK2] were set up, growth and development, photosynthetic characteristics, chlorophyll fluorescence parameters and changes of flowering period of Hemerocallis fulva under different root zone temperature were measured. The results showed that T20 treatment significantly increased the plant height, leaf length, leaf width, leaf number and scape height of Hemerocallis fulva cv.Free Wheelin and Hemerocallis fulva cv.Big City Eye. Flower diameter of Hemerocallis fulva among the four treatments were not significantly different. Scape growing date of T20 treatment was the earliest, and flowering period of T20 treatment was the longest. The initial flowering period of Hemerocallis fulva cv.Free Wheelin at T20 treatment was 11, 23 and 30 d earlier than those of T15, CK1 and CK2. The initial flowering period of Hemerocallis fulva cv.Big City Eye at T20 treatment was 15, 27 and 21 d earlier than those of T15, CK1 and CK2. The net photosynthetic rate (Pn), transpiration rate (Tr), intercellular CO2 concentration (Ci) and stomatal conductance (Gs) of Hemerocallis fulva cv.Free Wheelin and Hemerocallis fulva cv.Big City Eye were the largest in T20, and were the smallest in CK1. The actual photochemical efficiency of PSⅡ (ΦPSⅡ), PS Ⅱ light energy capture efficiency (Fv'/Fm'), photochemical quenching coefficient (qP) of Hemerocallis fulva cv.Free Wheelin and Hemerocallis fulva cv.Big City Eye in four treatments were not significantly different. In summary, T20(20±1) ℃/(15±1) ℃(day/night) treatment was more conducive to promote the growth and development of Hemerocallis fulva, and the various indicators of Hemerocallis fulva cv.Big City Eye were better, and resulted in flowering in advance.

Key words: Hemerocallis fulva, root-zone, temperature, flowering period, photosynthetic parameters, chlorophyll fluorescence parameters

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