Ahmad S, Mahmood A, Malik AJ, Karim A and Kumbhar MB, 2003. Response of okra to water stress. Sarhad Journal of Agriculture, 19(1): 73-79.
Aiken GR, McKnight DM, Wershaw RL and Mccarthy P, 1985. Humic substances in soil, sediment and water. Wiley-Interscience, New York. U.S.A.
Atiyeh RM, Lee S, Edwards CA, Arancon NQ and Metzger JD, 2002. The influence of humic acids derived from earthworm-processed organic wastes on plant growth. Bioresource Technology, 84(1): 7-14.
Balakumbahan R and K Rajamani, 2010. Effect of biostimulants on growth and yield of Senna (Cassia angustifolia var KKM.1). Journal of Horticultural Science and Ornamental Plants, IDOSI publication, 2(1): 16-8.
Barzegar T, Delshad M, Majd-abadi A, Kashi A and Ghashgaie J, 2012. Effects of water stress on yield, growth and some physiological parameters of Iranian melon. Iranian Journal of Horticultural Science, 42(4): 357-363. (In Persian).
Bohnert HJ and Jensen RG, 1996. Strategies for engineering water-stress tolerance in plants. Journal of Biotechnology. 14: 89-97.
Burce JA, 1991. Comparative responses of leaf conductance to humidity in single attached leaves. Experimental Botany, 32: 629-634.
Chakmak T and Atici O, 2009. Effects of putrescine and low temperature on the apoplastic antioxidant enzymes in the leaves of two wheat cultivars. Journal of Plant, Soil and Environment, 55(8): 320-326.
Chamaani F, Khodabande N, Habibi D, Asgharzadeh A and Davoodi-fard M, 2012. Effects of salinity stress on yield and yield components of inoculated wheat by plant growth promoting bacteria (Azotobacter chroocccum, Azospirillum lipoferum, and Pseudomonase putida) and humic acid. Iranian Journal of Agriculture and Plant Breeding, 8(1): 25-37, (In Persian).
Cangi R, Tarakcioglu C and Yasar H, 2006. Effect of humic acid applications on yield, fruit characteristics and nutrient uptake in Ercis grape (Vitis vinifera L.) cultivar. Asian Journal Chemistry, 18: 1493-1499.
Delfine S, Tognetti R, Desiderio E and Alvino A, 2005. Effect of foliar application of N and humic acids on growth and yield of durum wheat. Agronomy for Sustainable Development, 25: 183-191.
El-Nemr MA, El-Desuki M, El-Bassiony AM and Fawzy ZF, 2012. Response of growth and yield of cucumber plants (Cucumis sativus L.) to different foliar applications of humic acid and bio-stimulators. Journal of Basic and Applied Sciences, 6: 630-637.
Farooq M, Wahid A and Lee DJ, 2009. Exogenously applied polyamines increase drought tolerance of rice by improving leaf water status, photosynthesis and membrane properties. Plant Physiology, 31: 937-45.
Gibon Y, Sulpice R and Larher F, 2000. Proline accumulation in canola leaf discs subjected to osmotic stress is related to the loss of chlorophylls and to the decrease of mitochondrial activity. Physiologia Plantarum, 110(4): 469-476.
Goatley JM and Schmidt RE, 1990. Anti-senescence activity of chemicals applied to Kentucky bluegrass, Horticultural Science, 115: 57–61.
Groppa MD, Benavides MP, 2008. Polyamines and abiotic stress: recent advances. Amino Acids, 34: 35-45.
Gupta S, Agarwal VP and Gupta NK, 2012. Efficacy of putrescine and benzyladenine on photosynthesis and productivity in relation to drought tolerance in wheat (Triticum aestivum L.). Physiology and Molecular Biology of Plants, 18(4): 331-336.
Haghighi S, Saki Nejad T and Lack Sh, 2011. Effect of biological fertilizer of humic acid on metabolic process of biological nitrogen fixation. Life Science, 8(3): 43-48.
Javed H, Aziz MA and Leghari RAK, 2009. Resistance in different okra cultivars (Abelamoschus esculentus L.) against American bollworm Helicoverpa arnigera Hub. Journal of Agricultural Science, 47(4): 433-438.
Kaur-Sawhney R, Tiburcio AF and Galston AW, 2003. Polyamines in plants: An overview. Journal of Cell and Molecular Biology, 2: 1-12.
Khosravi-mashizi M and Arvin MJ, 2013. Impact of foliar application with potassium, calcium and humic acid on growth, fruit yield and quality of muskmelon. Iranian Journal of Horticultural Science and Technology 13(4): 469-482, (In Persian).
Kusano T, Berberich T, Tateda C and Takahashi Y, 2008. Polyamines: essential factors for growth and survival. Journal of Planta, 228: 367-381.
Mahajan S and Tuteja N, 2005. Cold, salinity and drought stresses. Biochemistry and Biophysics, 444: 139-158.
Mostufi I and Najafi F, 2005. Laboratory analytical methods in horticulture. Publication of Tehran University. (in Persian).
Muscolo A, Sidari M and Nardi S, 2013. Humic substance: relationship between structure and activity. Deeper information suggests univocal findings. Journal of Geochemical. Exploration, 129: 57-63.
Nardi, S, Pizzeghello D, Muscolo A and Vianello, A, 2002. Physiological effects of humic substances on higher plants. Journal of Soil Biology and Biochemistry, 34: 1527-1536.
Nayyar H, Kaur S, Kumar SS, Singh KJ and Dhir KK, 2005. Involvement of polyamines in the contrasting sensitivity of chickpea (Cicer arietinum L.) and soybean (Glycine max) to water deficit stress. Botanical Bulletin of Academic Sinica, 46: 333-338.
Orabi SA, Salman SR and Shalaby MA, 2010. Increasing resistance to oxidative damage in cucumber (Cucumis sativus L.) plants by exogenous application of salicylic acid and paclobutrazol. Journal of Agricultural Sciences, 6(3): 252-259.
Padem H, Ocal A and Alan R, 1999. Effect of humic acid added foliar fertilizer on quality and nutrient content of eggplant and pepper seedlings. In International Symposium Greenhouse Management for Better Yield and Quality in Mild Winter Climates. 491: 241-246.
Reddy AR, Chaitanya KV and Vivekanandan M, 2004. Drought-induced responses of photosynthesis and antioxidant metabolism in higher plants.Journal of Plant Physiology, 161(11): 1189-1202.
Salman SR, Abou-Hussein SD, Abdel-Mawgoud AMR and El-Nemr MA, 2005. Fruit yield and quality of watermelon as affected by hybrids and humic acid application. Journal of Applied Science Research, 1(1): 51-58.
Sankar B, Abdul Jaleel C, Manivannan P, Kishorekumar A, Somasundaram R and Panneerselvan R, 2007. Drought-induced biochemical modifications and proline metabolism in Abelmoschus esculentus (L.) Moench. Acta Botanica Croatica, 66: 43-56
Sarker BC, Hara M and Uemura M, 2005. Proline synthesis, physiological responses and biomass yield of eggplants during and after repetitive soil moisture stress. Scientia Horticulturae, 103(4): 387-402.
Schmidt SP and Osborn TG, 1993. Effects of endophyte-infected tall fescue on animal performance. Agriculture, Ecosystems and Environment, 44: 233-262.
Shah J and Klessig DF, 1999. Salicylic acid: signal perception and transduction. Biochemistry and Molecular Biology of Plant Hormones, 33: 513-541.
Shao HB, Chu LY, Jaleel CA and Zhao CX, 2008. Water-deficit stress-induced anatomical changes in higher plants. Comptes Rendus Biologies, 331: 215-225.
Sharif M, Khattak RA and Sarir MS, 2002. Effect of different levels of lignitic coal derived humic acid on growth of maize plants. Communications in Soil Science and Plant Analysis, 33: 3567-3580.
Sharma ML, 1999. Polyamine metabolism under abiotic stress in higher plants: salinity, drought and high temperature. Physiology and Molecular Biology of Plants, 5: 103-113.
Sharma, S.P., Leskovar D.I., Crosby K.M., Volder, A. & Ibrahim, A.M.H. (2014). Root growth, yield, and fruit quality responses of reticulatus and inodorus melons (Cucumis melo L.) to deficit subsurface drip irrigation. Agricaltural Water Management, 136, 75–85.
Shi J, Fu XZ, Peng T, Huang XS, Fan QJ and Liu JH, 2010. Spermine pretreatment confers dehydration tolerance of citrus in vitro plants via modulation of antioxidative capacity and stomatal response. Tree Physiology, 30: 914–922.
Singh BP, 1987. Effect of irrigation on the growth and yield of okra. Horticultural Science, 22(5): 879-880.
Talaat IM, Bekheta MA and Mahgoub MH, 2005. Physiological response of periwinkle plants (Catharanthus roseus L.) to tryptophan and putrescine. International Journal of Agriculture and Biology, 7: 210-213.
Tambussi EA, Bartoli CG, Bettran J, Guiamet JJ and Araus JC, 2000. Oxidative damage to thylakoids proteins in water stressed leaves of wheat (Triticum aestivum L.). Plantarum Physiologia, 108: 398-404.
Türkmen Ö, 2005. Effects of arbuscular mycorrhizal fungus and humic acid on the seedling development and nutrient content of pepper grown under saline soil conditions. Journal of Biological Sciences, 5(5): 568-574.
Vaziri J, Salamat AR, Entesari MR, Meschi M, Hidary N and Dehghani Saanich H, 2009. Crop Evapotranspiration (Guidelines for Computing Crop Water Requirements) (Translate). Publication of Iranian National Committee on Irrigation and Drainage. (In Persian).
Zaky MH, Zoah EL and Ahmed ME, 2006. Effects of humic acids on growth and productivity of bean plants grown under plastic low tunnels and open field. Egyptian Journal of Applied Sciences, 21(4): 582-596.
)