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Journal of Plant Biology

, 50:8 | Cite as

Estimation of leaf number and leaf area of hydroponic pak-choi plants (Brassica campestns ssp,chinensis) using growing degree-days

  • Young Yeol Cho
  • Jung Eek Son
Article

Abstract

Temperature is a principal environmental factor that directly affects the growth and timing of appearance for crop leaves. To estimate the leaf number and leaf area of ‘Seoul’ pak-choi plants (Brassica campestns ssp.chinensis), we applied the concept of growing degree-days GDD=(Tavg-Tbase) × days, where Tavg, Tbase and days were the daily average air temperature, base temperature, and days after transplanting, respectively. Leaves that were beginning to unfold with a leaf area ≥1 cm2 were counted every 2 to 3 d. Linear relationships were found between leaf number and days after transplanting as well as between leaf number and GDD. The rate of appearance and the number of leaves per GDD were 0.542 leaves d-1 and 0.051 leaves oC-1 d-1, respectively. In contrast, the relationship was non-linear between leaf number and leaf area, with the latter being calculated as [(128.9+11.6×GDD-0.03×GDD2)/1+(0.051×GDD+3.5) /13.7)-3.9] (cm2oC1 d-1). Using model validation, we found that the estimated leaf number and leaf area showed strong agreement with measured values. our results demonstrate the usefulness of modeling to estimate total leaf area and growth from hydroponically grown pak-choi plants.

Keywords

base temperature growing degree units leaf area leaf number model pak-choi 

Literature Cited

  1. Baker JT, Pinter PJ Jr.,Reginato RJ, Kanemasu ET (1986) Effects of temperature on leaf appearance in spring and winter wheat cultivars. Agron J78: 605–613Google Scholar
  2. Dwyer LM, Stewart DW (1986) Leaf area development in field-grown maize. Agron J78: 334–343Google Scholar
  3. Faust JE, Heins RD (1993) Modeling leaf development of the African violet (Saintpaulia ionantha Wendl.). J Amer Soc Hort Sci118: 747–751Google Scholar
  4. Gallagher JN (1979) Field studies of cereal leaf growth: I. Initiation and expansion in relation to temperature and ontogeny. J Exp Bot30: 625–636CrossRefGoogle Scholar
  5. Gallagher JN, Biscoe RV (1978) Radiation, absorption, growth and yield of cereals. J Agric Sci Camb91: 47–60CrossRefGoogle Scholar
  6. Gardner FP, Pearce RB, Mitchell RL (1990) Physiology of Crops Plants. Iowa State Univ Press, AmesGoogle Scholar
  7. Hammer GL, Hill K, Schrodter GN (1987) Leaf area production and senescence of diverse grain sorghum hybrids. Field Crops Res17: 305–317CrossRefGoogle Scholar
  8. Karlsson MG, Werner JW (2001) Temperature affects leaf unfolding rate and flowering of cyclamen. Hort Science36: 292–294Google Scholar
  9. Kirby EJM, Appleyard M, Fellowes G (1985) Effect of sowing date and variety on main shoot leaf emergence and number of leaves of barley and wheat. Agronomie5: 117–125CrossRefGoogle Scholar
  10. Liu W, Li S, Chen DL (2003) Use of amino acid nitrogen for growth by pak-choi under sterile culture. Acta Hort627: 131–138Google Scholar
  11. McMaster GS, Wilhelm WW (1997) Growing degree-days: One equation, two interpretations, Agr Forest Meteorol87: 291–300CrossRefGoogle Scholar
  12. Muchow RC, Carberry PS (1989) Environmental control of phenology and leaf growth in a tropically adapted maize. Field Crops Res20: 221–236CrossRefGoogle Scholar
  13. Muchow RC, Carberry PS (1990) Phenology and leaf-area development in a tropical grain sorghum. Field Crops Res23: 221–237CrossRefGoogle Scholar
  14. NeSmith DS (1997) Summer squash (Cucurbita pepo L.) leaf number as influenced by thermal time. Sci Hort68: 219–225CrossRefGoogle Scholar
  15. Ritchie JT, NeSmith DS (1991) Temperature and crop development,In RJ Hanks, JT Ritchie, eds, Modelling Plant and Soil Systems. Agron Monogr 31, Amer Soc Agron, MadisonGoogle Scholar
  16. Slafer GA, Connor DJ, Hailoran GM (1994) Rate of leaf appearance and final number of leaves in wheat: Effects of duration and rate of change of photoperiod. Ann Bot74: 427–436CrossRefGoogle Scholar
  17. Smart RE (1985) Principles of grapevine canopy microclimate manipulation with implications for yield and quality: A review. Amer J Enol Vitic36: 230–239Google Scholar
  18. Warrington IJ, Kanemasu ET (1983) Corn growth response to temperature and photoperiod: II. Leaf-initiation and leaf appearance rates. Agron J75: 755–761Google Scholar
  19. Williams L III, Martinson TE (2003) Nondestructive leaf area estimation of ‘Niagara’ and ‘DeChaunac’ grapevines. Sci Hort98: 493–498CrossRefGoogle Scholar
  20. Williams LE (1987) Growth of ‘Thompson Seedless’ grapevines: I. Leaf area development and dry weight distribution. J Amer Hort Sci112: 325–330Google Scholar
  21. Yin X, Kropff MJ (1996) The effect of temperature on leaf appearance in rice. Ann Bot77: 215–221CrossRefGoogle Scholar

Copyright information

© The Botanical Society of Korea 2007

Authors and Affiliations

  1. 1.Department of Plant Science and Research Institute for Agriculture and Life SciencesSeoul National UniversitySeoulKorea

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