Patterns of dry matter partitioning and 14C-photosynthate allocation in 1.5-year-old Scots pine seedlings

Change in dry matter partitioning, 14C-incorporation, and sink 14C-activity of 1.5-year-old Scots pine (Pinus sylvestris L.) seedlings grown in growth chamber conditions were studied during a 91-day experiment. On five sampling dates, seedlings were labelled with 14CO2 and whole-plant allocation pat...

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Main Author: Jukka Lippu
Format: Article
Language:English
Published: Finnish Society of Forest Science 1994-12-01
Series:Silva Fennica
Subjects:
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author Jukka Lippu
author_facet Jukka Lippu
author_sort Jukka Lippu
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description Change in dry matter partitioning, 14C-incorporation, and sink 14C-activity of 1.5-year-old Scots pine (Pinus sylvestris L.) seedlings grown in growth chamber conditions were studied during a 91-day experiment. On five sampling dates, seedlings were labelled with 14CO2 and whole-plant allocation patterns were determined. Intensively growing shoots modified the dry matter partitioning: during shoot growth the proportion of roots decreased but after that it increased. Based on their large proportion of dry matter, the needles (excluding current needles) were the strongest sink of carbon containing 40% of the incorporated 14C. Despite their small initial sink size, the elongating shoots (current main shoot + current branch) and their needles were the second strongest sink (30–40% of the total 14C) which reflects their high physiological activity. The proportion of 14C in the current year’s main shoot increased during shoot growth but decreased as the growth began to decline after 70 days. 10–20% of the total assimilated 14C was translocated to the roots. Laterals above 2nd order were the strongest sink in the root system, containing twice as much 14C as the other roots together. Alternation between shoot and root growth can be seen clearly: carbon allocation to roots was relatively high before and after the period of intensive shoot growth. Changes in root sink strength resulted primarily from changes in root sink activity rather than sink size.
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spelling doaj.art-be88cc3bd7bf4cd79f4b8a724ef2177f2022-12-22T00:35:34ZengFinnish Society of Forest ScienceSilva Fennica2242-40752242-40751994-12-0128310.14214/sf.a9169Patterns of dry matter partitioning and 14C-photosynthate allocation in 1.5-year-old Scots pine seedlingsJukka LippuChange in dry matter partitioning, 14C-incorporation, and sink 14C-activity of 1.5-year-old Scots pine (Pinus sylvestris L.) seedlings grown in growth chamber conditions were studied during a 91-day experiment. On five sampling dates, seedlings were labelled with 14CO2 and whole-plant allocation patterns were determined. Intensively growing shoots modified the dry matter partitioning: during shoot growth the proportion of roots decreased but after that it increased. Based on their large proportion of dry matter, the needles (excluding current needles) were the strongest sink of carbon containing 40% of the incorporated 14C. Despite their small initial sink size, the elongating shoots (current main shoot + current branch) and their needles were the second strongest sink (30–40% of the total 14C) which reflects their high physiological activity. The proportion of 14C in the current year’s main shoot increased during shoot growth but decreased as the growth began to decline after 70 days. 10–20% of the total assimilated 14C was translocated to the roots. Laterals above 2nd order were the strongest sink in the root system, containing twice as much 14C as the other roots together. Alternation between shoot and root growth can be seen clearly: carbon allocation to roots was relatively high before and after the period of intensive shoot growth. Changes in root sink strength resulted primarily from changes in root sink activity rather than sink size.pinus sylvestriscarbon14c-incorporationdry matter partitioningphotosynthesisroot growthshoot growthallocation
spellingShingle Jukka Lippu
Patterns of dry matter partitioning and 14C-photosynthate allocation in 1.5-year-old Scots pine seedlings
Silva Fennica
pinus sylvestris
carbon
14c-incorporation
dry matter partitioning
photosynthesis
root growth
shoot growth
allocation
title Patterns of dry matter partitioning and 14C-photosynthate allocation in 1.5-year-old Scots pine seedlings
title_full Patterns of dry matter partitioning and 14C-photosynthate allocation in 1.5-year-old Scots pine seedlings
title_fullStr Patterns of dry matter partitioning and 14C-photosynthate allocation in 1.5-year-old Scots pine seedlings
title_full_unstemmed Patterns of dry matter partitioning and 14C-photosynthate allocation in 1.5-year-old Scots pine seedlings
title_short Patterns of dry matter partitioning and 14C-photosynthate allocation in 1.5-year-old Scots pine seedlings
title_sort patterns of dry matter partitioning and 14c photosynthate allocation in 1 5 year old scots pine seedlings
topic pinus sylvestris
carbon
14c-incorporation
dry matter partitioning
photosynthesis
root growth
shoot growth
allocation
work_keys_str_mv AT jukkalippu patternsofdrymatterpartitioningand14cphotosynthateallocationin15yearoldscotspineseedlings