Physiological and growth responses to experimental warming in first-year seedlings of deciduous tree species

Jiae An, Saerom Han, Hanna Chang, Min Ji Park, Seongjun Kim, Jaehong Hwang, Min Seok Cho, Haegeun Chung, Yo Whan Son

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Increasing temperature might affect physiological and growth traits of seedlings, which are particularly important for tree survival. This study was conducted to investigate the physiological and growth responses of first-year seedlings to open-field experimental warming during one growing season. Seedlings of three deciduous tree species (Fraxinus rhynchophylla Hance, Zelkova serrata (Thunb.) Makino, and Quercus variabilis Blume) were warmed with infrared heaters with a mean air temperature difference of 3.07 °C between the treatments. Physiological traits (net photosynthetic rate, transpiration rate, stomatal conductance, and total chlorophyll content) were measured in July, September, and October 2014, and growth traits (root collar diameter (RCD), shoot length, component biomass, and root mass to stem mass ratio (RSR)) were measured in June, August, and October 2014 for harvested seedlings. Net photosynthetic rate, transpiration rate, and stomatal conductance were not affected by the warming treatment, whereas total chlorophyll content increased. Shoot length, leaf biomass, and stem biomass were enhanced under the warming treatment, whereas RCD and root biomass did not differ between the treatments. Thus, relative root growth declined under the warming treatment. It is likely that the elevated temperature provides optimal conditions for the biosynthesis of chlorophyll. Moreover, seedlings allocated more carbon to aboveground growth than to belowground growth when temperatures were elevated. In contrast, net photosynthetic rate, transpiration rate, and stomatal conductance were hindered, failing to increase as an adaptive mechanism to warming-induced water stress. Further studies are needed to elucidate (1) the direct effect of a decline in soil moisture, (2) why RSR declines to different extents in different species, and (3) the relationship between decreased root growth and seedling survival under the warming treatment.

Original languageEnglish
Pages (from-to)175-182
Number of pages8
JournalTurkish Journal of Agriculture and Forestry
Volume41
Issue number3
DOIs
Publication statusPublished - 2017

Fingerprint

deciduous tree
physiological response
growth response
Seedlings
warming
seedling
seedlings
Biomass
Growth
stomatal conductance
transpiration
Chlorophyll
chlorophyll
root crown
biomass
growth traits
Temperature
root growth
Zelkova serrata
infrared heaters

Keywords

  • Ash
  • Experimental warming
  • Japanese zelkova
  • Oriental oak
  • Seedling growth

ASJC Scopus subject areas

  • Forestry
  • Food Science
  • Ecology

Cite this

Physiological and growth responses to experimental warming in first-year seedlings of deciduous tree species. / An, Jiae; Han, Saerom; Chang, Hanna; Park, Min Ji; Kim, Seongjun; Hwang, Jaehong; Cho, Min Seok; Chung, Haegeun; Son, Yo Whan.

In: Turkish Journal of Agriculture and Forestry, Vol. 41, No. 3, 2017, p. 175-182.

Research output: Contribution to journalArticle

An, Jiae ; Han, Saerom ; Chang, Hanna ; Park, Min Ji ; Kim, Seongjun ; Hwang, Jaehong ; Cho, Min Seok ; Chung, Haegeun ; Son, Yo Whan. / Physiological and growth responses to experimental warming in first-year seedlings of deciduous tree species. In: Turkish Journal of Agriculture and Forestry. 2017 ; Vol. 41, No. 3. pp. 175-182.
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AU - An, Jiae

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AU - Cho, Min Seok

AU - Chung, Haegeun

AU - Son, Yo Whan

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AB - Increasing temperature might affect physiological and growth traits of seedlings, which are particularly important for tree survival. This study was conducted to investigate the physiological and growth responses of first-year seedlings to open-field experimental warming during one growing season. Seedlings of three deciduous tree species (Fraxinus rhynchophylla Hance, Zelkova serrata (Thunb.) Makino, and Quercus variabilis Blume) were warmed with infrared heaters with a mean air temperature difference of 3.07 °C between the treatments. Physiological traits (net photosynthetic rate, transpiration rate, stomatal conductance, and total chlorophyll content) were measured in July, September, and October 2014, and growth traits (root collar diameter (RCD), shoot length, component biomass, and root mass to stem mass ratio (RSR)) were measured in June, August, and October 2014 for harvested seedlings. Net photosynthetic rate, transpiration rate, and stomatal conductance were not affected by the warming treatment, whereas total chlorophyll content increased. Shoot length, leaf biomass, and stem biomass were enhanced under the warming treatment, whereas RCD and root biomass did not differ between the treatments. Thus, relative root growth declined under the warming treatment. It is likely that the elevated temperature provides optimal conditions for the biosynthesis of chlorophyll. Moreover, seedlings allocated more carbon to aboveground growth than to belowground growth when temperatures were elevated. In contrast, net photosynthetic rate, transpiration rate, and stomatal conductance were hindered, failing to increase as an adaptive mechanism to warming-induced water stress. Further studies are needed to elucidate (1) the direct effect of a decline in soil moisture, (2) why RSR declines to different extents in different species, and (3) the relationship between decreased root growth and seedling survival under the warming treatment.

KW - Ash

KW - Experimental warming

KW - Japanese zelkova

KW - Oriental oak

KW - Seedling growth

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