Characteristics of chlorophyll fluorescence and antioxidative system in super-hybrid rice and its parental cultivars under chilling stress

Abstract

Characteristics of chlorophyll fluorescence and antioxidative system were investigated in rice (Oryza sativa L.) super-hybrid Liangyoupeijiu (LYPJ), maternal cultivar Peiai64s, and paternal cultivar indica rice 9311 under chilling stress. During 6-d chilling treatment, chlorophyll content of all three genotypes was gradually declined. However, the decrease in photosystem 2 (PS 2) maximum photochemical efficiency (F v /F m ) and quantum yield of PS 2 (Φ PS2 ) was less expressive in LYPJ than in parental cultivars The electrolyte leakage and malondialdehyde content in all cultivars increased after chilling treatment, but LYPJ exhibited the least increasing tendency. Activities of superoxide dismutase (SOD), ascorbate peroxidase (APX) and glutathione reductase (GR) were higher in LYPJ than in parental cultivars. The results demonstrated that tolerance to chilling stress in LYPJ might be adopted mostly from its maternal cultivar.

Leaf Growth, Gas Exchange and Chlorophyll Fluorescence Parameters in Response to Different Water Deficits in Wheat Cultivars

“…We also found that non-photochemical quenching was signifi cantly increased by water defi cit (Fig. 2H), indicating an increase in thermal dissipation compensating the reduced photochemical dissipation (Zhang et al, 2010). Higher non-photochemical quenching at 25%FC in XN889 than in CY17 may be associated with its larger Fv/ Fm, which indicated that the damage to PSII in XN889 was less than that in CY17.…”

“…Reduction of Fv/Fm and Fv/Fo (Fig. 2D, E) indicated damage to an important portion of the PSII reaction center (Zhang et al, 2010). ΦPSII and ETR decreased under water defi cit conditions (Fig.…”

Application of phytohormones during seed hydropriming and heat shock treatment on sunflower (Helianthus annuus L.) chilling resistance and changes in soluble carbohydrates

“…Decreased photochemical efficiency of photosystem II due to negative chilling effect is frequently expressed as variable to maximum fluorescence ratio (F v /F m ) (Zhou and Guo 2009). As a consequence of chilling stress, the excess of excitation energy is not promptly quenched and in turn accelerates the formation of reactive oxygen species (ROS), resulting in the reduction of the photosynthetic efficiency (Zhang et al 2010).…”

Contrastive responses of spring and winter wheat cultivars to chilling and acclimation treatments

“…Chilling and acclimation treatments did not affect maximum quantum yield of PS II (F v /F m ) in 'Sabalan', while caused a significant reduction of F v /F m in 'Zagros' (Table 1). It is well documented that photosynthetic apparatus is sensitive to several environmental stresses and PS II appears to be preferentially affected by chilling stress (Zhang et al, 2010). Reduction of F v /F m in 'Zagros' indicated either damage to PS II or reversible and photoprotective photoinhibition via down-regulation of PS II (Rosenqvist and van Kooten 2003).…”