مرکز منطقه ای اطلاع رساني علوم و فناوري - Low Night Temperature Tolerance Determining Traits Correlate with Paraquat Tolerance in Grapevine Genotypes

Abstract :

The objective of this study was to reveal that low night temperature (LNT) tolerance concerning traits and relation with paraquat (PQ) tolerance in four grapevine (Vitis vinifera L.) genotypes. Grapevine genotypes were grown in greenhouse conditions and subjected to LNT at 5C. Electrolyte leakage and lipid peroxidation of leaves indicates fundamental differences between the selected genotypes regarding their response to LNT stress. According to extent of damage, Dimrit and Razakı were assessed as tolerant, while Hatun Parmağı and Ata Sarısı were sensitive to LNT. Low night temperature tolerant genotypes, showed higher resistance to PQ as compared to sensitive genotypes. Photosytem II activity as an indicator of photodamage maintained almost stable in both tolerant and sensitive genotypes. In tolerant genotypes photosynthetic pigment contents was protected, whereas in sensitive genotypes, Hatun Parmağı and Ata Sarısı, significant losses occurred; in total chlorophyll (Chl) content about 48 and 49 % and in carotenoid (Car) content about 51 and 67 % when plants subjected to chilling. In sensitive genotypes, soluble protein content was remained unchanged, free proline content was sharply increased in a response of damage. The correlation analysis showed that lipid peroxidation level indicating membrane damage is having positive correlation with soluble protein content and negatively correlated with, PQ tolerance, Chl/Car ratio, chlorophyll and carotenoid content. This data confirmed the LNT tolerance of grapevine genotypes mainly based on better protection of photosynthetic apparatus and membranes from oxidative stress.