Effect of Glomus aggregatum on photosynthetic function of snap bean in response to elevated ozone

Snap bean genotypes (Phaseolus vulgaris L.) with different ozone (O3) sensitivities (line S156: O3-sensitive; line R123: O3-tolerant) were grown for 70 days with or without inoculation of arbuscular mycorrhizal (AM) fungi under ambient (CAMB = 20 nanolitres (nl)/l and elevated (CMID = '50 nl/l and CHIG = 80 nl/l) O3. Sequential determinations (leaf injury, pigment concentration, chlorophyll fluorescence, photosynthesis, etc) were carried out during plant growth to evaluate mycorrhizal influence on the photosynthetic function of the two genotypes under elevated O3. Inoculation with AM fungi alleviated leaf injury in both genotypes and delayed time of injury manifestation (TIM) in the R123 line at the blooming stage (growth stage (GS): 61-65 (Zadoks scale, Zadoks et al. 1974), 30–35 days after the onset of O3 fumigation), but mycorrhizal effect was slight at the initial growth stage (GS 11–13, 0–5 days after onset of O3 fumigation).

Website: http://www.arjonline.org/agricultural-sciences/american-research-journal-of-agriculture/