Ozone-induced stomatal sluggishness develops progressively in Siebold's beech (Fagus crenata)

Hoshika, Yasutomo; Watanabe, Makoto; Inada, Naoki; Koike, Takayoshi

Ozone-induced stomatal sluggishness develops progressively in Siebold's beech (Fagus crenata)

2012

Hoshika, Yasutomo | Watanabe, Makoto | Inada, Naoki | Koike, Takayoshi

We investigated the effects of ozone and leaf senescence on steady-state stomatal conductance and stomatal response to light variation. Measurements were carried out in a free-air ozone exposure experiment on a representative deciduous broadleaved tree species in Japan (Fagus crenata). Both steady-state and dynamic stomatal response to light variation varied intrinsically with season due to leaf senescence. Ozone induced the decrease in steady-state leaf gas exchange and the sluggish stomatal closure progressively. These findings suggest that ozone reduces the ability of plants to adapt to a fluctuating light environment under natural conditions, and therefore impairs plant growth and ability to control water loss.

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