Details

Autor(en) / Beteiligte

• Hoshika, Yasutomo
• De Carlo, Anna
• Baraldi, Rita
• Neri, Luisa
• Carrari, Elisa
• Agathokleous, Evgenios
• Zhang, Lu
• Fares, Silvano
• Paoletti, Elena

Titel

Ozone-induced impairment of night-time stomatal closure in O 3 -sensitive poplar clone is affected by nitrogen but not by phosphorus enrichment

Ist Teil von

• The Science of the total environment, 2019-11, Vol.692, p.713

Ort / Verlag

Netherlands

Erscheinungsjahr

2019

Quelle

MEDLINE

Beschreibungen/Notizen

• Nocturnal transpiration may be a key factor influencing water use in plants. Tropospheric ozone (O ) and availability of nutrients such as nitrogen (N) and phosphorus (P) in the soil can affect daytime water use through stomata, but the combined effects of O , N and P on night-time stomatal conductance (g ) are not known. We investigated the effects of O and soil availability of N and P on nocturnal g and the dynamics of stomatal response after leaf severing in an O -sensitive poplar clone (Oxford) subjected to combined treatments over a growing season in an O free air controlled exposure (FACE) facility. The treatments were two soil N levels (0 and 80 kg N ha ; N0 and N80), three soil P levels (0, 40 and 80 kg P ha ; P0, P40 and P80) and three O levels (ambient concentration, AA [35.0 ppb as hourly mean]; 1.5 × AA; 2.0 × AA). The analysis of stomatal dynamics after leaf severing suggested that O impaired stomatal closure execution. As a result, nocturnal g was increased by 2.0 × AA O in August (+39%) and September (+108%). Night-time g was correlated with POD (phytotoxic O dose) and increased exponentially after 40 mmol m POD . Such increase of nocturnal g was attributed to the emission of ethylene due to 2.0 × AA O exposure, while foliar abscisic acid (ABA) or indole-3-acetic acid (IAA) did not affect g at night. Interestingly, the O -induced stomatal opening at night was limited by N treatments in August, but not limited in September. Phosphorus decreased nocturnal g , although P did not modify the O -induced stomatal dysfunction. The results suggest that the increased nocturnal g may be associated with a need to improve N acquisition to cope with O stress.