Characterization of the main lipid components of chloroplast membranes and cold induced changes in Coffea spp.

Correlation between total lipids, linolenic acid and membrane injury under PEG-induced dehydration in leaves of Vigna genotypes differing in drought resistance

“…On the other hand, it could be remarked that the polar headgroup also plays a role in the susceptibility of the molecule, since DGDG, the other major galactolipid of the chloroplast membrane, is also highly unsaturated, but is much less degraded under water stress conditions (Scotti-Campos et al, 2013). The fact that cell membranes of the resistant genotypes contain less C18:3 may confer them a lower susceptibility to degradative processes, as reported under high irradiation (Ramalho et al, 1998), drought (Matos et al, 2010), heat (Dias et al, 2010) and cold (Campos et al, 2003;Partelli et al, 2011) stress conditions.…”

“…Under stress conditions, they undergo modifications which either enable them to acclimate to the new environment or lead to irreversible injury and cell death (Kuiper, 1985;Harwood, 1998).Qualitative and quantitative changes of membrane lipids have been involved in adaptation to many abiotic stresses, such as cold (Partelli et al, 2011;Scotti-Campos et al, 2014a), heat (Scotti-Campos et al, 2014b), aluminium toxicity (Huynh et al, 2012) and drought Matos et al, 2010;Scotti-Campos et al, 2013), among others.…”

Seasonal Vegetative Growth in Genotypes of Coffea canephora, as Related to Climatic Factors

“…Partelli et al, 2009Partelli et al, , 2011. However, to these differences could have contributed the differences in the maturation cycle, as the varieties studied here included those with early, average, late, and super-late maturation cycles (Fonseca et al, 2004).…”

“…In coffee, low temperatures (below the range of 13-17 ºC, depending on the authors and genotypes) and pronounced water deficit (-3 MPa) affect various components of the photosynthetic process, as it reduces the stomatal conductance, net photosynthesis, photochemical efficiency of photosystem II, thylakoid electron transport, enzyme activity and carbon metabolism as a whole. Low temperatures also affect the composition and structure of photosynthetic pigment complexes and of the lipid matrix of cell membranes, particularly in the chloroplast, although to different extent among genotype and species Ramalho et al, 2003;Silva et al, 2004, Praxedes et al, 2006Partelli et al, 2009Partelli et al, , 2011Batista-Santos et al, 2011). Such changes may reflect impairments or damages, but in some cases are responses towards plant cold acclimation.…”

Response of linear and cyclic electron flux to moderate high temperature and high light stress in tomato

“…In spite of these findings, the major photoprotection mechanism that plays an important role for de-excitation of excess light energy in green plants is the non-photochemical quenching (NPQ) mechanism, containing the xanthophyll cycle and the protonation of residues on key LHCII proteins (Kanazawa and Kramer, 2002;Ivanov et al, 2015). Aside from NPQ, the photosynthetic electron transportation regulation in chloroplasts of the thylakoid membrane is cardinally important for plant development (Partelli et al, 2011). There are two types of electron flux on the thylakoid membrane, linear electron flux (LEF) and cyclic electron flux (CEF).…”