nstantaneous and historical temperature effects on a-pinene
Effects
of “short” photoperiods on seedling growth of Pinusbrutia
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Author Details
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V.Iakovoglou
Department
of Forestry and Management of the Natural Environment, TEI Kabalas, Drama66100,
Greece
K.Radoglou
(Corresponding author)
Forest
Research Institute, National Agricultural Research Foundation, Vassilika 57006, Thessaloniki,
Greece
e-mail: radoglou@fri.gr
P.Kostopoulou
Forest
Research Institute, National Agricultural Research Foundation, Vassilika 57006, Thessaloniki,
Greece
O.Dini-Papanastasi
Forest
Research Institute, National Agricultural Research Foundation, Vassilika 57006, Thessaloniki,
Greece
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Publication Data
Paper received:
13
August 2010
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Revised
received:
08
February 2011
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Accepted:
16 February 2011
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Abstract
This study investigated how nurseries could benefit by
inducing “short” photoperiods as low as 4 hr to produce “better” seedlings
characterized by more vigorous roots; a substantial feature to overcome
transplanting stress. The carryover effect of the photoperiod was also
investigated on seedlings that grew for 30 days moreunder the consistent 14 hr
photoperiod.Seedlings of Pinusbrutia were
subjected to 4, 6, 8 and 14 hr photoperiod for 3 week.Fifteen seedlings were used to evaluate the
leaf area, the root and shoot dry weight and their ratio.Six and sixteen seedlings were used to
evaluate the shoot electrolyte leakage and the root growth potential,
respectively.Based on the results,
the 6 and 8 hr photoperiod indicated greater root allocation (4.8 and 4.9 mg,
respectively) and chlorophyll content (3.7 and 4.4, respectively). They also
indicated greater leaf area values (3.3 and 3.5 cm2, respectively)
along with the 14 hr (3.4 cm2). The photoperiod effect continued
even after seedlings were subjected at consistent photoperiod.Overall, “short” photoperiods could provide
“better” P. brutiaseedlings to accommodate
immediate massive reforestation and afforestation
needs.
Key words
Afforestation, Pinusbrutia,Reforestation, Short photoperiod