Isoprene emission, photosynthesis, and growth in sweetgum (Liquidambar styraciflua) seedlings exposed to short- and long-term drying cycles

Chengwei Fang, Russell Monson, Ellis B. Cowling

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

Isoprene emissions were studied in one-year old sweetgum (Liquidambar styraciflua L.) seedlings during nine drying-rewatering cycles extending over five months. Each drying cycle lasted to the point of leaf wilting. Growth was essentially stopped in response to the first drying cycle, though seedling survival and capacity to recover turgor on rewatering remained high throughout the entire nine cycles. Photosynthetic rates of leaves were inhibited by the drying treatments. Under severe drought, isoprene emission rates of leaves were also inhibited, though isoprene emission was generally less sensitive to drought than photosynthesis. The lower drought sensitivity of isoprene emission compared with photosynthesis resulted in a higher percentage of fixed carbon lost as isoprene as seedlings became more stressed. During the recovery phase of the drying-rewatering cycles, isoprene emission rates in several seedlings were higher than in well-watered control seedlings. Following the ninth drying-rewatering cycle, sustained daily watering resulted in recovery of isoprene emission rates to control values within four days. Photosynthetic rates only recovered to 50% of control values after seven days. We conclude that the mechanisms regulating photosynthetic rate and isoprene emission rate are differentially influenced by limited water supplies. The results are consistent with past studies that predict a protective role for isoprene emission during stress, particularly protection from excessive leaf temperatures during drought.

Original languageEnglish (US)
Pages (from-to)441-446
Number of pages6
JournalTree Physiology
Volume16
Issue number4
StatePublished - Apr 1996
Externally publishedYes

Fingerprint

Liquidambar
Liquidambar styraciflua
isoprene
Photosynthesis
Seedlings
photosynthesis
drying
seedling
seedlings
Growth
Droughts
drought
leaves
wilting
Water Supply
turgor
rate
water supply

Keywords

  • Drought
  • Isoprene synthase
  • Survival
  • Thermoprotection

ASJC Scopus subject areas

  • Forestry
  • Plant Science

Cite this

Isoprene emission, photosynthesis, and growth in sweetgum (Liquidambar styraciflua) seedlings exposed to short- and long-term drying cycles. / Fang, Chengwei; Monson, Russell; Cowling, Ellis B.

In: Tree Physiology, Vol. 16, No. 4, 04.1996, p. 441-446.

Research output: Contribution to journalArticle

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