Photosynthetica 1999, 36(11):123-130 | DOI: 10.1023/A:1007031332521

Differences in Field Gas Exchange and Water Relations Between a C3 Dicot (Plantago Asiatica) and a C4 Monocot (Eleusine Indica)

T. Kobayashi1, K. Okamoto1, Y. Hori1
1 Laboratory of Ecology, Department of Environmental Sciences, Faculty of Science, Ibaraki University, Mito, Japan

Field gas exchange and water potential in the leaves of a C3 dicot, Plantago asiatica L., and a C4 monocot, Eleusine indica Gaertn., which dominate in trampled vegetation in eastern Japan were surveyed during the growing periods for two consecutive years. Net photosynthetic rate (P N) of E. indica increased with photosynthetic photon flux density (PPFD) and leaf temperature (TL). P N was not saturated at PPFDs above 1500 µmol m-2 s-1 and at TL above 30 °C. On a sunny day in mid summer, maximum P N was two times higher in E. indica than in P. asiatica [42 vs. 20 µmol(CO2) m-2 s-1], but their transpiration rate (E) and the leaf water potential (ΨL) were similar. Soil-to-leaf hydraulic conductance, which probably plays a role in water absorption from the trampled compact soil, was higher in E. indica than in P. asiatica. The differences in photosynthetic traits between E. indica explain why E. indica communities more commonly develop at heavily trampled sites in summer than the P. asiatica communities.

Additional key words: diurnal pattern; intercellular CO2 concentration; leaf conductance; leaf water potential; micro-habitat; photosynthesis; seasonal dominance; soil-to-leaf hydraulic conductance; trampling tolerance; transpiration

Published: July 1, 1999  Show citation

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Kobayashi, T., Okamoto, K., & Hori, Y. (1999). Differences in Field Gas Exchange and Water Relations Between a C3 Dicot (Plantago Asiatica) and a C4 Monocot (Eleusine Indica). Photosynthetica, 37(1), 123-130. doi: 10.1023/A:1007031332521
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