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Awn contribution to gas exchanges of barley ears

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Photosynthetica

Abstract

The effects of awn removal on ear gas exchange in four barley lines (Morex, Harrington, Steptoe, and TR306) were studied under a controlled environment using a Before-After Control-Impact Paired (BACIP) experimental design. From ear emergence to grain maturity, plants were grown in pots at either 60 or 90 % of soil water holding capacity. Gas-exchange measurements of ears were made 9 and 10 d after anthesis (DAA). On 11 DAA, awn removal was performed on half of the ears in each pot, followed by measurements on both intact and de-awned ears on 12 and 13 DAA. Net photosynthetic (P N) and transpiration (E) rates decreased significantly with awn removal, but dark respiration (R D) rate was not affected. We estimated for each ear a temperature-adjusted respiration rate (R a) from R D. When we corrected P N with R a, we found that rates of spikelet photosynthesis were largely underestimated. Moderate water stress had minimal effect on gas exchange of bracts and awns of the barley ear. Barley lines did not differ for any individual gas-exchange parameter.

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Abbreviations

BACIP:

Before-After Control-Impact Paired

DAA:

days after anthesis

E:

transpiration rate

iWUE:

instantaneous water-use efficiency

P N :

net photosynthetic rate

P G :

gross photosynthetic rate

PPFD:

photosynthetic photon flux density

R a :

temperature-adjusted respiration rate

R D :

dark respiration rate

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Authors and Affiliations

  1. Department of Plants, Soils and Biometeorology, Utah State University, Logan, UT, 84322, USA

    Q.Z. Jiang, D. Roche & D. Hole

  2. Ecology Center, Utah State University, Logan, UT, 84322, USA

    S. Durham

Authors
  1. Q.Z. Jiang
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  2. D. Roche
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  3. S. Durham
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  4. D. Hole
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Correspondence to D. Roche.

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Jiang, Q., Roche, D., Durham, S. et al. Awn contribution to gas exchanges of barley ears. Photosynthetica 44, 536–541 (2006). https://doi.org/10.1007/s11099-006-0067-9

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  • DOI: https://doi.org/10.1007/s11099-006-0067-9

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