1. Van Nocker S, Berry G, Najdowski J, Michelutti R, Luffman M, Forsline P, Alsmairat N, Beaudry R, Nair MG, Ordidge M. Genetic diversity of red-fleshed apples (Malus). Euphytica. 2012;185:281-293.
2. Singh R, Rastogi S, Dwivedi UN. Phenylpropanoid metabolism in ripening fruits. Compr Rev Food Sci Food Saf. 2010;9:398-416.
3. Ubi BE, Honda C, Bessho H, Kondo S, Wada M, Kobayashi S, Moriguchi T. Expression analysis of anthocyanin biosynthetic genes in apple skin: Effect of UV-B and temperature. Plant Sci. 2006;170:571-578.
4. Jahn D, Heinz DW. Biosynthesis of 5- aminolevulinic acid, Tetrapyrroles. Springer. 2009;29-42
Korkmaz A. Effects of exogenous application of 5-aminolevulinic acid in crop plants. In: Abiotic Stress Responses in Plants. 2012;215-234.
5. Wang ZH, Tang GH, Li ZQ, Wang LJ. Promotion of 5-aminolevulinic acid and genistein on anthocyanin accumulation in apples. Acta Hortic Sin. 2006;33:1055-1058.
6. Xie L, Wang ZH, Cheng XH, Gao JJ, Zhang ZP, Wang LJ. 5-Aminolevulinic acid promotes anthocyanin accumulation in Fuji apples. Plant Growth Regul. 2013;69:295-303.
7. Korkmaz A. Effects of exogenous application of 5-aminolevulinic acid in crop plants. In: Abiotic Stress Responses in Plants. 2012;215-234.
8. Watanabe K, Ryoji O, Rasid MM, Suliman A, Tohru T, Hitoshi K, Yasutomo T. Effects of 5-aminolevulinic acid to recover salt damage on cotton, tomato, and wheat seedlings in Saudi Arabia. J Arid Land Studies. 2004;14:105-113.
9. Watanabe K, Tanaka T, Hotta Y, Kuramochi H, Takeuchi Y. Improving salt tolerance of cotton seedlings with 5-aminolevulinic acid. Plant growth regul. 2000;32:97-101.
10. Akram NA, Ashraf M, Al-Qurainy F. Aminolevulinic acid-induced changes in some key physiological attributes and activities of antioxidant enzymes in sunflower (Helianthus annuus L.) plants under saline regimes. Sci Hort. 2012;142:143-148.
11. Naeem MS, Warusawitharana H, Liu H, Liu D, Ahmad R, Waraich EA, Xu L, Zhou WJ. 5-Aminolevulinic acid alleviates the salinity-induced changes in Brassica napus as revealed by the ultra-structural study of chloroplast. Plant Physiol Biochem. 2012;57:84-92.
12. Yang Z, Chang Z, Sun L, Yu J, Huang B. Physiological and metabolic effects of 5- aminolevulinic acid for mitigating salinity stress in creeping bentgrass. PLoS ONE. 2014;9:e116283.
13. Murashige T, Skoog F. A revised medium for rapid growth and bioassays with tobacco tissue culture. Plant Physiol. 1962;15:473-497.
14. Lichtenthaler HK. Chlorophylls and carotenoids: Pigments of photosynthetic biomembranes. Methods Enzymol. 1987;148:350-382.
15. Brand-Williams W, Cuvelier ME, Berset C. Use of a free radical method to evaluate antioxidant activity. Lebenson Wiss Technol. 1995;28:25-30.
16. Bradford MM. A rapid and sensitive method for the quantification of microgram quantities of protein utilizing the principle of protein-dye binding. Anal Chem. 1976;72:248-254.
17. Aebi H. Catalase in vitro. Methods in enzymology. 1984;105:121-126.
18. Putter J. “Peroxidase” Methods of enzymatic analysis. 1974;685-690.
19. Nakano Y, Asada K. Hydrogen peroxide is scavenged by ascorbate-specific peroxidase in spinach chloroplasts. Plant Cell Physiol. 1981;22:867-880.
20. Beyer WF, Fridovich I. Assaying for superoxide dismutase activity: some large consequences of minor changes in conditions. Anal Biochem. 1987;161:559-566.
21. Slinkard K, Singleton VL. Total phenol analyses: Automation and comparison with manual methods. Am J Enol Vitic. 1977;28:49-55.
22. Guisti MM, Wrolstad RE. Characterization and measurement of anthocyanins by UV-Visible spectroscopy. Current Protocols in Food Analytical Chemistry. (F1.21-F1.2.13). New York: John Wiley & Sons. 2001.
23. Youssef T, Awad MA. Mechanisms of enhancing photosynthetic gas exchange in date palm seedlings (Phoenix dactylifera L.) under salinity stress by a 5-aminolevulinic acid-based fertilizer. J Plant Growth Regul. 2008;27:1-9.
24. Wang JJ, Jiang WB, Huang BJ. Promotion of 5-aminolevulinic acid on photosynthesis of melon (Cucumis melo) seedlings under low light and chilling stress conditions. Plant Physiol. 2004;121:258-264.
25. Misra N, Gupta AK. Effect of salinity and different nitrogen sources on the activity of antioxidant enzymes and indole alkaloid content in Catharanthus roseus seedlings. J Plant Physiol. 2006;163:11-18.
26. Meratan A, Ghaffari SM, Niknam V. Effects of salinity on growth, proteins and antioxidant enzymes in three Acanthophyllum species of different ploidy levels. JUST. 2008;33:1-8.
27. Li DM, Zhang J, Sun WJ, Li Q, Dai AH, Bai JG. 5-Aminolevulinic acid pretreatment mitigates drought stress of cucumber leaves through altering antioxidant enzyme activity. Sci Hort. 2011;130:820-828.
28. Zhen A, Bie ZL, Huang Y, Liu ZX, Fan ML. Effects of 5 aminolevulinic acid on the H2O2-content and antioxidative enzyme gene expression in NaCl-treated cucumber seedlings. Biol Plant. 2012;56:566-570.
29. Ali B, Xu X, Gill RA, Yang S, Ali S, Tahir M, Zhou W. Promotive role of 5-aminolevulinic acid on mineral nutrients and antioxidative defense system under lead toxicity in Brassica napus. Ind Crops Prod. 2014;52:617-626.
30. Giorgi A, Mingozzi M, Madeo M, Speranza G, Cocucci M. Effect of nitrogen starvation on the phenolic metabolism and antioxidant properties of yarrow (Achillea collina Becker ex Rchb.). Food Chem. 2009;114;204-211.
31. Noreen Z, Ashraf M. Assessment of variation in antioxidative defense system in salt treated pea (Pisum sativum L.) cultivars and its putative use as salinity tolerance markers. J Plant Physiol. 2009;166:1764-1774.
32. Kanto U, Jutamanee K, Osotsapar Y, Chai- aree W, Jattupornpong S. Promotive effect of priming with 5- Aminolevulinic acid on seed germination capacity, seedling growth and antioxidant enzyme activity in rice subjected ated ageing treatment. Plant Prod sci. 2015;18:443-454.