01978nab a2200229 i 4500003000900000005001700009008004100026040001800067072001400085100003600099100002900135245009700164500007000261520105300331650002501384650001901409650002301428773018901451856008101640942000801721999001901729BR-BrBNA20260422153136.0260422b2019    bl.qr|pooa||| 00| 0 eng |  aBR-BrBNAbeng  aF62b3240  aFreitas, Cleverson Henrique de   aMartins, Fabrina Bolzan   aThermal Requirements and Photoperiod Influence in the Leaf Development of Two Forest Species  aPublicação on-line; 20 ref.; 4 tables; 1 illus.; Summary (En)  a

ABSTRACT

The aim of this work was to evaluate the effect of thermal time methods and to identify the
phyllochron and photoperiod response in seedlings of two forest species: Corymbia citriodora and
Eucalyptus urophylla. A field experiment was installed under a completely randomized design,
in a 2 × 11 factorial scheme, with two forest species and eleven sowing dates (E). Phyllochron is
influenced by thermal time methods. The best thermal time method is the one that considers the
base and optimum temperature and compares them with daily extreme temperatures. In addition,
the influence of photoperiod and air temperature on phyllochron values was also verified. The lowest
value occurred in E1 (Corymbia citriodora: 24.6 and Eucalyptus urophylla: 13.2 °C day leaf-1)
and the highest in E10 (Corymbia citriodora: 46.4 °C day leaf-1) and E7 (Eucalyptus urophylla:
29.2 °C day leaf-1), suggesting that the phyllochron is influenced by sowing dates.

Keywords: Corymbia citriodora, Eucalyptus urophylla, phyllochron, degree days, daylength.  aEUCALYPTUS UROPHYLLA  aFOTOPERIODISMO  aFISIOLOGIA VEGETAL0 029299347953dRio de Janeiro-RJ Instituto de Florestas - UFRRJ 1994o2025-0452tFloresta e Ambiente (Brazil)x1415-0980  /  ISSN 2179-8087 0nlinegv. 26(4) p. 1-9; (2019)wBR2026001249  uhttps://www.scielo.br/j/floram/a/hrWP8dNrSDLK5BtBvphFxHm/?format=pdf&lang=en  cANA  c341505d341505