Humidity Pretreatment Affects the Responses of Dtomata and CO_2 Assimilation to Vapor Pressure Difference in C_3 and C_4 Plants

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概要

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• Experiments were carried out to investigate the long-term influence of humidity on the short-term responses of stomata and CO_2 assimilation to vapor pressure difference in Oryza sativa (rice, C_3 species) and Panicum maximum (green panic, C_4 species). Plants were grown for four weeks in growth chambers set. at 35% and 85% relative humidity at 25℃ air temperature, 38±2 Pa CO_2 partial pressure and 1,700 pmol m^<-2> s^<-1> photon flux density. Soil was saturated with water in both humidity treatments. Low humidity pretreatments caused low leaf conductance and low rates of transpiration and CO_2 assimilation in O. sativa, but small changes in stomatal responses to humidity and in CO_2 assimilation were found in P. maximum. From the short-term gas ex-change experiments, it was noted that the responsiveness of leaf conductance to vapor pressure difference were affected by humidity pretreatments in O. sativa, whereas unaffected in P. maximum. In O. sativa measurements of CO_2 assimilation as a function of internal CO_2 partial pressure (A-Ci curve) indicated that low humidity pretreatments reduced the CO_2 assimilation at high internal CO_2 partial pressure, but the initial slope of the A-Ci curve was unaffected. Further-more, plant characteristics such as total dry weight and leaf area of plants subjected to low humidity were lower than plants subjected to high humidity. The reductions in O. sativa, how-ever, were larger than in P. maximum. Stomatal frequency from low humidity grown plant was higher than that from high humidity grown plants in both species although there is no significant difference. The data indicated that if the short term inhibition of net CO_2 assimilation at a high vapor pressure difference was imposed during vegetative growth, the photosynthetic biochemistry and the resultant plant growth were largely depressed in O. sativa, a C_3 species.

• 日本植物生理学会の論文

著者

• Kawamitsu Yoshinobu

  College Of Agriculture University Of The Ryukyus

• Agata Waichi

  Department of Agriculture, Faculty of Agriculture, Kyushu University

• Agata Waichi

  Department Of Agronomy Faculty Of Agriculture Kyushu University

• YODA Shinji

  Yame Seibu Agricultural Extension Office

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