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Effect of high temperature on photosynthesis and transpiration of sweet corn (Zea mays L. var. rugosa)

Ben-Asher, J. ; Garcia y Garcia, A. ; Hoogenboom, G.

Photosynthetica, 2008-12, Vol.46 (4), p.595-603 [Periódico revisado por pares]

Dordrecht: Springer Netherlands

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  • Título:
    Effect of high temperature on photosynthesis and transpiration of sweet corn (Zea mays L. var. rugosa)
  • Autor: Ben-Asher, J. ; Garcia y Garcia, A. ; Hoogenboom, G.
  • Assuntos: Biomedical and Life Sciences ; Life Sciences ; Original Papers ; Plant Physiology
  • É parte de: Photosynthetica, 2008-12, Vol.46 (4), p.595-603
  • Descrição: Four temperature treatments were studied in the climate controlled growth chambers of the Georgia Envirotron: 25/20, 30/25, 35/30, and 40/35 °C during 14/10 h light/dark cycle. For the first growth stage (V3-5), the highest net photosynthetic rate ( P N ) of sweet corn was found for the lowest temperature of 28–34 µmol m −2 s −1 while the P N for the highest temperature treatment was 50–60 % lower. We detected a gradual decline of about 1 P N unit per 1 °C increase in temperature. Maximum transpiration rate ( E ) fluctuated between 0.36 and 0.54 mm h −1 (≈5.0–6.5 mm d −1 ) for the high temperature treatment and the minimum E fluctuated between 0.25 and 0.36 mm h −1 (≈3.5–5.0 mm d −1 ) for the low temperature treatment. Cumulative CO 2 fixation of the 40/35 °C treatment was 33.7 g m −2 d −1 and it increased by about 50 % as temperature declined. The corresponding water use efficiency (WUE) decreased from 14 to 5 g(CO 2 ) kg −1 (H 2 O) for the lowest and highest temperature treatments, respectively. Three main factors affected WUE, P N , and E of Zea : the high temperature which reduced P N , vapor pressure deficit (VPD) that was directly related to E but did not affect P N , and quasi stem conductance (QC) that was directly related to P N but did not affect E . As a result, WUE of the 25/20 °C temperature treatment was almost three times larger than that of 40/35 °C temperature treatment.
  • Editor: Dordrecht: Springer Netherlands
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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