Lipocalin that prevents thylakoidal membrane lipids peroxidation and confers protection against oxidative stress, especially mediated by singlet oxygen in response to high light and other stress (e.g. heat shocks) (PubMed:19674405, PubMed:23837879). Required for seed longevity by insuring polyunsaturated lipids integrity (PubMed:23837879). Expressed in leaves at low levels (at protein levels) (PubMed:23837879). Present in seeds (PubMed:23837879). Accumulates in response to drought, high light, paraquat and abscisic acid (ABA) treatments (at protein level). Increased sensitivity to photo-oxidative stress induced by drought, high light or paraquat, associated with a rapid accumulation of hydroxy fatty acids mediated by singlet oxygen (PubMed:19674405). When associated with disruption in TIL, highly sensitive to temperature, drought and light stresses than the single mutants, exhibiting intense lipid peroxidation. Seeds of this double mutant are very sensitive to natural and artificial aging, associated with the oxidation of polyunsaturated lipids (PubMed:23837879). Belongs to the calycin superfamily. Lipocalin family.