The functional significance of C3-C4 intermediate traits in Heliotropium L. (Boraginaceae)

Gas exchange perspectives

Patrick J. Vogan, Michael Wick Frohlich, Rowan F. Sage

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

We demonstrate for the first time the presence of species exhibiting C 3-C4 intermediacy in Heliotropium (sensu lato), a genus with over 100 C3 and 150 C4 species. CO2 compensation points (Γ) and photosynthetic water-use efficiencies (WUEs) were intermediate between C3 and C4 values in three species of Heliotropium: Heliotropium convolvulaceum (Γ = 20 μmol CO2 mol-1 air), Heliotropium racemosum (Γ = 22 μmol mol-1) and Heliotropium greggii (Γ = 17 μmol mol-1). Heliotropium procumbens may also be a weak C 3-C4 intermediate based on a slight reduction in Γ (48.5 μmol CO2 mol-1) compared to C 3Heliotropium species (52-60 μmol mol-1). The intermediate species H. convolvulaceum, H. greggii and H. racemosum exhibited over 50% enhancement of net CO2 assimilation rates at low CO 2 levels (200-300 μmol mol-1); however, no significant differences in stomatal conductance were observed between the C3 and C3-C4 species. We also assessed the response of Γ to variation in O2 concentration for these species. Heliotropium convolvulaceum, H. greggii and H. racemosum exhibited similar responses of Γ to O2 with response slopes that were intermediate between the responses of C3 and C4 species below 210 mmol O 2 mol-1 air. The presence of multiple species displaying C3-C4 intermediate traits indicates that Heliotropium could be a valuable new model for studying the evolutionary transition from C3 to C4 photosynthesis.

Original languageEnglish (US)
Pages (from-to)1337-1345
Number of pages9
JournalPlant, Cell and Environment
Volume30
Issue number10
DOIs
StatePublished - Oct 1 2007

Fingerprint

Heliotropium
Boraginaceae
gas exchange
Gases
C4 plants
carbon dioxide
C3 plants
Air
air
C4 photosynthesis
Photosynthesis
Carbon Monoxide
water use efficiency
stomatal conductance
assimilation (physiology)

All Science Journal Classification (ASJC) codes

  • Physiology
  • Plant Science

Cite this

Vogan, Patrick J. ; Frohlich, Michael Wick ; Sage, Rowan F. / The functional significance of C3-C4 intermediate traits in Heliotropium L. (Boraginaceae) : Gas exchange perspectives. In: Plant, Cell and Environment. 2007 ; Vol. 30, No. 10. pp. 1337-1345.
@article{bbcaa3cbe09044869bdcd712b1261ee7,
title = "The functional significance of C3-C4 intermediate traits in Heliotropium L. (Boraginaceae): Gas exchange perspectives",
abstract = "We demonstrate for the first time the presence of species exhibiting C 3-C4 intermediacy in Heliotropium (sensu lato), a genus with over 100 C3 and 150 C4 species. CO2 compensation points (Γ) and photosynthetic water-use efficiencies (WUEs) were intermediate between C3 and C4 values in three species of Heliotropium: Heliotropium convolvulaceum (Γ = 20 μmol CO2 mol-1 air), Heliotropium racemosum (Γ = 22 μmol mol-1) and Heliotropium greggii (Γ = 17 μmol mol-1). Heliotropium procumbens may also be a weak C 3-C4 intermediate based on a slight reduction in Γ (48.5 μmol CO2 mol-1) compared to C 3Heliotropium species (52-60 μmol mol-1). The intermediate species H. convolvulaceum, H. greggii and H. racemosum exhibited over 50{\%} enhancement of net CO2 assimilation rates at low CO 2 levels (200-300 μmol mol-1); however, no significant differences in stomatal conductance were observed between the C3 and C3-C4 species. We also assessed the response of Γ to variation in O2 concentration for these species. Heliotropium convolvulaceum, H. greggii and H. racemosum exhibited similar responses of Γ to O2 with response slopes that were intermediate between the responses of C3 and C4 species below 210 mmol O 2 mol-1 air. The presence of multiple species displaying C3-C4 intermediate traits indicates that Heliotropium could be a valuable new model for studying the evolutionary transition from C3 to C4 photosynthesis.",
author = "Vogan, {Patrick J.} and Frohlich, {Michael Wick} and Sage, {Rowan F.}",
year = "2007",
month = "10",
day = "1",
doi = "10.1111/j.1365-3040.2007.01706.x",
language = "English (US)",
volume = "30",
pages = "1337--1345",
journal = "Plant, Cell and Environment",
issn = "0140-7791",
publisher = "Wiley-Blackwell",
number = "10",

}

The functional significance of C3-C4 intermediate traits in Heliotropium L. (Boraginaceae) : Gas exchange perspectives. / Vogan, Patrick J.; Frohlich, Michael Wick; Sage, Rowan F.

In: Plant, Cell and Environment, Vol. 30, No. 10, 01.10.2007, p. 1337-1345.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The functional significance of C3-C4 intermediate traits in Heliotropium L. (Boraginaceae)

T2 - Gas exchange perspectives

AU - Vogan, Patrick J.

AU - Frohlich, Michael Wick

AU - Sage, Rowan F.

PY - 2007/10/1

Y1 - 2007/10/1

N2 - We demonstrate for the first time the presence of species exhibiting C 3-C4 intermediacy in Heliotropium (sensu lato), a genus with over 100 C3 and 150 C4 species. CO2 compensation points (Γ) and photosynthetic water-use efficiencies (WUEs) were intermediate between C3 and C4 values in three species of Heliotropium: Heliotropium convolvulaceum (Γ = 20 μmol CO2 mol-1 air), Heliotropium racemosum (Γ = 22 μmol mol-1) and Heliotropium greggii (Γ = 17 μmol mol-1). Heliotropium procumbens may also be a weak C 3-C4 intermediate based on a slight reduction in Γ (48.5 μmol CO2 mol-1) compared to C 3Heliotropium species (52-60 μmol mol-1). The intermediate species H. convolvulaceum, H. greggii and H. racemosum exhibited over 50% enhancement of net CO2 assimilation rates at low CO 2 levels (200-300 μmol mol-1); however, no significant differences in stomatal conductance were observed between the C3 and C3-C4 species. We also assessed the response of Γ to variation in O2 concentration for these species. Heliotropium convolvulaceum, H. greggii and H. racemosum exhibited similar responses of Γ to O2 with response slopes that were intermediate between the responses of C3 and C4 species below 210 mmol O 2 mol-1 air. The presence of multiple species displaying C3-C4 intermediate traits indicates that Heliotropium could be a valuable new model for studying the evolutionary transition from C3 to C4 photosynthesis.

AB - We demonstrate for the first time the presence of species exhibiting C 3-C4 intermediacy in Heliotropium (sensu lato), a genus with over 100 C3 and 150 C4 species. CO2 compensation points (Γ) and photosynthetic water-use efficiencies (WUEs) were intermediate between C3 and C4 values in three species of Heliotropium: Heliotropium convolvulaceum (Γ = 20 μmol CO2 mol-1 air), Heliotropium racemosum (Γ = 22 μmol mol-1) and Heliotropium greggii (Γ = 17 μmol mol-1). Heliotropium procumbens may also be a weak C 3-C4 intermediate based on a slight reduction in Γ (48.5 μmol CO2 mol-1) compared to C 3Heliotropium species (52-60 μmol mol-1). The intermediate species H. convolvulaceum, H. greggii and H. racemosum exhibited over 50% enhancement of net CO2 assimilation rates at low CO 2 levels (200-300 μmol mol-1); however, no significant differences in stomatal conductance were observed between the C3 and C3-C4 species. We also assessed the response of Γ to variation in O2 concentration for these species. Heliotropium convolvulaceum, H. greggii and H. racemosum exhibited similar responses of Γ to O2 with response slopes that were intermediate between the responses of C3 and C4 species below 210 mmol O 2 mol-1 air. The presence of multiple species displaying C3-C4 intermediate traits indicates that Heliotropium could be a valuable new model for studying the evolutionary transition from C3 to C4 photosynthesis.

UR - http://www.scopus.com/inward/record.url?scp=34548186226&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34548186226&partnerID=8YFLogxK

U2 - 10.1111/j.1365-3040.2007.01706.x

DO - 10.1111/j.1365-3040.2007.01706.x

M3 - Article

VL - 30

SP - 1337

EP - 1345

JO - Plant, Cell and Environment

JF - Plant, Cell and Environment

SN - 0140-7791

IS - 10

ER -