Response to auxin changes during maturation-related loss of adventitious rooting competence in loblolly pine (Pinus taeda ) stem cuttings

2001 ◽  
Vol 111 (3) ◽  
pp. 373-380 ◽  
Author(s):  
Michael S. Greenwood ◽  
Xiuyu Cui ◽  
Fuyu Xu
Keyword(s):  
Pinus Taeda ◽  
Loblolly Pine ◽  
Adventitious Rooting ◽  
Stem Cuttings ◽  
Rooting Competence

scholarly journals Mist Level Influences Vapor Pressure Deficit and Gas Exchange During Rooting of Juvenile Stem Cuttings of Loblolly Pine

HortScience ◽  
2005 ◽  
Vol 40 (5) ◽  
pp. 1448-1456 ◽  
Author(s):  
Anthony V. LeBude ◽  
Barry Goldfarb ◽  
Frank A. Blazich ◽  
John Frampton ◽  
Farrell C. Wise
Keyword(s):  
Vapor Pressure ◽  
Pinus Taeda ◽  
Loblolly Pine ◽  
Vapor Pressure Deficit ◽  
Root Formation ◽  
Net Photosynthesis ◽  
Adventitious Rooting ◽  
Adventitious Root Formation ◽  
Stem Cuttings ◽  
Ambient Conditions

Two experiments were conducted during which juvenile hardwood or softwood stem cuttings of loblolly pine (Pinus taeda L.) were rooted under six mist regimes in a polyethylene-covered greenhouse to investigate the effect of mist level on vapor pressure deficit (VPD) and cutting water potential (Ψcut), and to determine the relationships between these variables and rooting percentage. In addition, net photosynthesis at ambient conditions (Aambient) and stomatal conductance (gs) were measured in stem cuttings during adventitious root formation to determine their relationship to rooting percentage. Hardwood stem cuttings rooted ≥80% when mean daily VPD between 1000 and 1800 hr ranged from 0.60 to 0.85 kPa. Although rooting percentage was related to Ψcut, and Aambient was related to Ψcut, rooting percentage of softwood stem cuttings was not related to Aambient of stem cuttings. Using VPD as a control mechanism for mist application during adventitious rooting of stem cuttings of loblolly pine might increase rooting percentages across a variety of rooting environments.

scholarly journals Mist, Vapor Pressure Deficit, and Cutting Water Potential Influence Rooting of Stem Cuttings of Loblolly Pine

HortScience ◽  
2004 ◽  
Vol 39 (4) ◽  
pp. 890D-890
Author(s):  
Anthony V. LeBude* ◽  
Barry Goldfarb ◽  
Frank A. Blazich
Keyword(s):  
Vapor Pressure ◽  
Water Potential ◽  
Pinus Taeda ◽  
Loblolly Pine ◽  
Large Scale ◽  
Vapor Pressure Deficit ◽  
Adventitious Root Formation ◽  
Silica Sand ◽  
Stem Cuttings ◽  
Range Of Values

Producing high quality rooted stem cuttings on a large scale requires precise management of the rooting environment. This study was conducted to investigate the effect of the rooting environment on adventitious root formation of stem cuttings of loblolly pine (Pinus taeda L.). Hardwood stem cuttings of loblolly pine were collected in Feb. 2002 from hedged stock plants and stored at 4 °C until setting in Apr. 2002. One hundred stem cuttings per plot in each of two replications received 45, 61, 73, 102, 147, or 310 mL·m-2 of mist delivered intermittently by a traveling gantry (boom) system. Mist frequency was similar for all treatments and was related inversely to relative humidity (RH) within the polyethylene covered greenhouse. Rooting tubs in each plot were filled with a substrate of fine silica sand, and substrate water potential was held constant using soil tensiometers that activated a subirrigation system. Cutting water potential was measured destructively on two cuttings per plot beginning at 0500 hr every 3 hh until 2300 hr (seven measurements) 7, 14, 21, or 28 days after setting. During rooting, leaf temperature and RH were recorded in each plot to calculate vapor pressure deficit (VPD). Cutting water potential and VPD were strongly related to mist application. Cutting water potential was also related to VPD. Rooting percentage had a linear and quadratic relationship with mean cutting water potential and VPD averaged between 1000 and 1800 HR. Eighty percent rooting occurred within a range of values for VPD. Data suggest that VPD can be used to manage the water deficit of stem cuttings of loblolly pine to increase rooting percentage. These results may be applicable to other species and to other rooting environments.

scholarly journals Influence of Stock Plant Nitrogen Fertilization on Rooting Stem Cuttings of Loblolly Pine

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 805D-805
Author(s):  
D.B. Rowe ◽  
F.A. Blazich ◽  
F.C. Wise ◽  
S.L. Warren
Keyword(s):  
Pinus Taeda ◽  
Loblolly Pine ◽  
Dry Weight ◽  
Stem Cuttings ◽  
Root Number ◽  
Stock Plant ◽  
Plant Nitrogen ◽  
Root Area ◽  
Sib Families ◽  
Complete Nutrient Solution

Containerized, 1.5-year-old, hedged stock plants of four full-sib families of loblolly pine (Pinus taeda L.) were fertilized daily with a complete nutrient solution containing 9 ppm P, 38 ppm K, and either 0, 5, 10, 20, or 40 ppm N. Softwood cuttings were removed in May and July 1994, and placed under intermittent mist at two locations: Raleigh and Summerville. Overall rooting was significantly greater at Summerville (49%) than in Raleigh (37%). Cuttings taken in May rooted at significantly greater percentages than the July cuttings (57% vs. 29%). Overall rooting (56%) and root area (12 cm2) were greatest at 40 ppm N, whereas root number (two), root dry weight (66 mg), and total root length (108 cm) were maximized at 20 ppm N. Although family was not significant, a family × nitrogen interaction occurred. For both rooting trials, maximum rooting (83%) was noted for May cuttings rooted in Summerville, which were taken from stock plants of one family fertilized with 20 ppm N.

scholarly journals 343 Effects of Jiffy Forestry Peat Pellets on Rooting and Subsequent Field Performance of Stem Cuttings of Loblolly Pine

HortScience ◽  
2000 ◽  
Vol 35 (3) ◽  
pp. 451B-451
Author(s):  
Anthony V. LeBude ◽  
Frank A. Blazich ◽  
Barry Goldfarb
Keyword(s):  
Pinus Taeda ◽  
Loblolly Pine ◽  
Field Performance ◽  
Dry Weight ◽  
First Year ◽  
Stem Cuttings ◽  
Pellet Size ◽  
Control Field ◽  
Control Root ◽  
Sib Families

Experiments conducted in January (hardwood cuttings) and June (softwood cuttings) 1998 compared rooting and root dry weight (DW) of stem cuttings of three full-sib families of loblolly pine (Pinus taeda L.) rooted in Jiffy forestry peat pellets and Ray Leach Super Cells. Ray Leach Super Cells (vol.= 162 cm3) served as the control and contained a medium of 2 peat: 3 perlite (v/v). Pellet sizes used were 25-65, 30-65, 36-65, 36-75, 42-65, 42-80, and 50-95 (dry diam.-expanded height in mm). Cuttings were taken from hedged stock plants and rooted for 12 weeks under mist in a humidity-controlled greenhouse. Following evaluation for rooting in the June experiment, ≈500 rooted cuttings in pellets and Ray Leach Super Cells were field-planted in eastern Georgia in December 1998 to study the effect of pellet size and cutting development on first-year field growth. Rooting percentages in January for hardwood cuttings rooted in pellet sizes 42-80 (36%) and 50-95 (57%) were less than the control (83%). Root DW for each pellet size was less than the control. Rooting percentage in June for softwood cuttings rooted in pellet size 36-65 (77%) was greater than the control (64%) whereas rooting percentages for cuttings rooted in pellet sizes 42-80 (50%) and 50-95 (52%) were less than the control. Root DWs for cuttings in pellet sizes 25-65, 30-65, 36-65, and 42-65 were less than the control. Field performance data will be presented.

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