effect of root pruning on the maturation of loblolly pine (Pinus taeda) plantlets, rooted hypocotyls, and seedlings

Loblolly pine (Pinus taeda L.) tissue culture plantlets, seedlings, and rooted hypocotyls were subjected to three root-pruning treatments (control, half apices pruned, all apices pruned) to determine if pruning could alter the maturation state of the shoots, and if there was a correlative alteration...

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Veröffentlicht in:Canadian journal of forest research 1991-07, Vol.21 (7), p.1073-1079
Hauptverfasser: Wisniewski, L.A, Brandon, D.L, McKeand, S.E, Amerson, H.V
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container_end_page 1079
container_issue 7
container_start_page 1073
container_title Canadian journal of forest research
container_volume 21
creator Wisniewski, L.A
Brandon, D.L
McKeand, S.E
Amerson, H.V
description Loblolly pine (Pinus taeda L.) tissue culture plantlets, seedlings, and rooted hypocotyls were subjected to three root-pruning treatments (control, half apices pruned, all apices pruned) to determine if pruning could alter the maturation state of the shoots, and if there was a correlative alteration of shoot cytokinin levels. Height, multiple characteristics of shoot morphology correlated with maturation, and root morphology were assessed. In comparisons with control plantlets, pruning significantly decreased plant height in half-pruned and all-pruned plantlets, needle length in all-pruned plantlets, terminal bud length and diameter in half-pruned and all-pruned plantlets, and needle dry weight in half-pruned plantlets. When these shoot morphological characteristics were regressed against height, the half-pruned plantlets appeared more juvenile than controls for both terminal bud length and diameter. All-pruned plantlets did not differ from controls. In comparisons of the three intact plant types, the plantlets were more mature than seedlings and rooted hypocotyls based on assessments of terminal bud length, terminal bud diameter, and needle length. However, in the half-pruned treatment these three characteristics did not differ among plantlets, seedlings, and hypocotyls, showing that they were equivalent for maturation status. Root pruning significantly increased the number of root apices for all plant types but did not increase plantlet or rooted hypocotyl cytokinin levels.
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Height, multiple characteristics of shoot morphology correlated with maturation, and root morphology were assessed. In comparisons with control plantlets, pruning significantly decreased plant height in half-pruned and all-pruned plantlets, needle length in all-pruned plantlets, terminal bud length and diameter in half-pruned and all-pruned plantlets, and needle dry weight in half-pruned plantlets. When these shoot morphological characteristics were regressed against height, the half-pruned plantlets appeared more juvenile than controls for both terminal bud length and diameter. All-pruned plantlets did not differ from controls. In comparisons of the three intact plant types, the plantlets were more mature than seedlings and rooted hypocotyls based on assessments of terminal bud length, terminal bud diameter, and needle length. However, in the half-pruned treatment these three characteristics did not differ among plantlets, seedlings, and hypocotyls, showing that they were equivalent for maturation status. Root pruning significantly increased the number of root apices for all plant types but did not increase plantlet or rooted hypocotyl cytokinin levels.</description><identifier>ISSN: 0045-5067</identifier><identifier>EISSN: 1208-6037</identifier><identifier>DOI: 10.1139/x91-147</identifier><identifier>CODEN: CJFRAR</identifier><language>eng</language><publisher>Ottawa, Canada: NRC Research Press</publisher><subject>anatomy and morphology ; Artificial regeneration. Forest nurseries. Planting ; Biological and medical sciences ; cytokinins ; Forestry ; Fundamental and applied biological sciences. Psychology ; hypocotyls ; maturation ; Pinus taeda ; root pruning ; seedlings ; shoots ; tissue culture ; Vegetative propagation. 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Height, multiple characteristics of shoot morphology correlated with maturation, and root morphology were assessed. In comparisons with control plantlets, pruning significantly decreased plant height in half-pruned and all-pruned plantlets, needle length in all-pruned plantlets, terminal bud length and diameter in half-pruned and all-pruned plantlets, and needle dry weight in half-pruned plantlets. When these shoot morphological characteristics were regressed against height, the half-pruned plantlets appeared more juvenile than controls for both terminal bud length and diameter. All-pruned plantlets did not differ from controls. In comparisons of the three intact plant types, the plantlets were more mature than seedlings and rooted hypocotyls based on assessments of terminal bud length, terminal bud diameter, and needle length. However, in the half-pruned treatment these three characteristics did not differ among plantlets, seedlings, and hypocotyls, showing that they were equivalent for maturation status. Root pruning significantly increased the number of root apices for all plant types but did not increase plantlet or rooted hypocotyl cytokinin levels.</description><subject>anatomy and morphology</subject><subject>Artificial regeneration. Forest nurseries. Planting</subject><subject>Biological and medical sciences</subject><subject>cytokinins</subject><subject>Forestry</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>hypocotyls</subject><subject>maturation</subject><subject>Pinus taeda</subject><subject>root pruning</subject><subject>seedlings</subject><subject>shoots</subject><subject>tissue culture</subject><subject>Vegetative propagation. 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Forest nurseries. Planting</topic><topic>Biological and medical sciences</topic><topic>cytokinins</topic><topic>Forestry</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>hypocotyls</topic><topic>maturation</topic><topic>Pinus taeda</topic><topic>root pruning</topic><topic>seedlings</topic><topic>shoots</topic><topic>tissue culture</topic><topic>Vegetative propagation. Micropropagation</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wisniewski, L.A</creatorcontrib><creatorcontrib>Brandon, D.L</creatorcontrib><creatorcontrib>McKeand, S.E</creatorcontrib><creatorcontrib>Amerson, H.V</creatorcontrib><collection>AGRIS</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><jtitle>Canadian journal of forest research</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Wisniewski, L.A</au><au>Brandon, D.L</au><au>McKeand, S.E</au><au>Amerson, H.V</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>effect of root pruning on the maturation of loblolly pine (Pinus taeda) plantlets, rooted hypocotyls, and seedlings</atitle><jtitle>Canadian journal of forest research</jtitle><addtitle>Revue canadienne de recherche forestière</addtitle><date>1991-07-01</date><risdate>1991</risdate><volume>21</volume><issue>7</issue><spage>1073</spage><epage>1079</epage><pages>1073-1079</pages><issn>0045-5067</issn><eissn>1208-6037</eissn><coden>CJFRAR</coden><abstract>Loblolly pine (Pinus taeda L.) tissue culture plantlets, seedlings, and rooted hypocotyls were subjected to three root-pruning treatments (control, half apices pruned, all apices pruned) to determine if pruning could alter the maturation state of the shoots, and if there was a correlative alteration of shoot cytokinin levels. Height, multiple characteristics of shoot morphology correlated with maturation, and root morphology were assessed. In comparisons with control plantlets, pruning significantly decreased plant height in half-pruned and all-pruned plantlets, needle length in all-pruned plantlets, terminal bud length and diameter in half-pruned and all-pruned plantlets, and needle dry weight in half-pruned plantlets. When these shoot morphological characteristics were regressed against height, the half-pruned plantlets appeared more juvenile than controls for both terminal bud length and diameter. All-pruned plantlets did not differ from controls. In comparisons of the three intact plant types, the plantlets were more mature than seedlings and rooted hypocotyls based on assessments of terminal bud length, terminal bud diameter, and needle length. However, in the half-pruned treatment these three characteristics did not differ among plantlets, seedlings, and hypocotyls, showing that they were equivalent for maturation status. Root pruning significantly increased the number of root apices for all plant types but did not increase plantlet or rooted hypocotyl cytokinin levels.</abstract><cop>Ottawa, Canada</cop><pub>NRC Research Press</pub><doi>10.1139/x91-147</doi><tpages>7</tpages></addata></record>
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ispartof Canadian journal of forest research, 1991-07, Vol.21 (7), p.1073-1079
issn 0045-5067
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source Alma/SFX Local Collection
subjects anatomy and morphology
Artificial regeneration. Forest nurseries. Planting
Biological and medical sciences
cytokinins
Forestry
Fundamental and applied biological sciences. Psychology
hypocotyls
maturation
Pinus taeda
root pruning
seedlings
shoots
tissue culture
Vegetative propagation. Micropropagation
title effect of root pruning on the maturation of loblolly pine (Pinus taeda) plantlets, rooted hypocotyls, and seedlings
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