Influence of growth stimulants on photosynthetic apparatus, morphogenesis and production process of eggplant (Solanum melongena)

Keywords: growth activators, morphology of Solanaceae, mesostructure, leaf apparatus, productivity


Artificial regulation of the growth and development of cultivated plants aiming at an increase of biological productivity and improvement of the quality of agricultural products is a significant objective of modern phytophysiology. The use of natural and synthetic growth stimulators is quite effective. The present paper discusses the issue of the influence of gibberellin acid (GA3), 1-naphthylacetic acid (1-NAA) and 6-benzylaminopurine (6-BAP) on the morphogenesis and productivity of aubergine plants of Diamond variety. Field experiments were conducted in 2013–2015. The plants were treated with such growth stimulators as 1-NAA, GA3 and 6-BAP at the concentration of 0.005% using a portable sprayer. The phytometric indices were fixed every 10 days, the mesostructure was checked in the leaves of the middle layer in the phase of fruit formation, the content of the amount of chlorophylls was determined in the fresh material by spectrophotometric method, the content of different forms of carbohydrates and nitrogen in the plant organs was estimated by biochemical methods in  fixed dry material. It was found that GA3 increased plant height on average by 16.3%. 1-NAA and 6-BAP practically did not change linear plant sizes. The germicides increased the number of leaves per plant (10.8–30.8%), the mass of their raw matter (19.9–47.5%) and the area of the leaf surface (17.5–42.5%). The most significant impact on these indicators was made by GA3. All the germicides increased the number of leaves per plant (14.3–20.9%). 6-BAP increased the thickness of the leaf blades by 6.3% due to the growth of chlorenchyma, and GA3 reduced it by 9.2%. Under the influence of 6-BAP and 1-NAA, the thickness of chlorenchyma was increased by 7.0% and 5.9% respectively.The upper and lower epidermis became thinner or did not change under the effects of these germicides. Under the plant treatment with 1-NAA and 6-BAP, the size of columnar parenchyma cells increased by 25.6% and 19.6% and the size of the spongiform parenchyma cells increased by 8.4–76.7%. Under the action of GA3, the cell volume of the columnar parenchyma did not change significantly, and the size of the spongy cells increased. This paper reveals that all growth stimulants reduced the number of epidermis cells (6.6–7.4%). Under the action of 1-NAA and 6-BAP, there was a decrease in the number of stomata per 1 mm2 of the abacus leaf surface, respectively,by 6.5% and 21.2%. Instead, after the use of GA3, an increase in the number of stomata was observed by 21.8%. Such germicides as 1-NAA and GA3 reduced the area of respiratory area by 11.7% and 21.4%, while the 6-BAP increased its area by 10.4%. The results of the research show that 6-BAP increased the content of the sum of chlorophylls a + b in leaves by 13.3%. Under the action of 1-NAA, this indicator had only a tendency to increase (6.7%), but under the influence of GA3 it decreased. Moreover, the processing with germicides significantly increased leaf and chlorophyll indices. All three growth stimulants have increased the mass of dry matter of plants and the net productivity of photosynthesis. The data demonstrate that growth stimulants have contributed to the accumulation of various forms of carbohydrates in the roots and fruits. In the stems and leaves there was a tendency to decrease the content of sugars and starch. The germicides significantly reduced the content of all forms of nitrogen in the roots, stems and fruits, and increased the content of protein nitrogen in the leaves. Under the action of GA3 and 6-BAP, the number of fruits per plant increased by 19.3% and 16.1%, respectively. All growth stimulants have significantly increased the average weight of the individual fetus (7.4–10.3%). As a result, the weight of the fruits from one plant after treatment with 1-NAA, GA3 and 6-BAP increased by 11.0%, 28.0% and 29.4%, respectively. There are grounds to think that growth stimulants, influencing anatomical, morphological, physiological and biochemical characteristics of aubergines, changed the nature of the donor-acceptor relationships in the plant, which intensified the production process and optimized its productivity.


Ahmed, W., Tahir, F. M., Rajwana, I. A., Raza, S. A., & Asad, H. U. (2012). Comparative evaluation of plant growth regulators for preventing premature fruit drop and improving fruit quality parameters in Dusehri Mango. International Journal of Fruit Science, 12, 372–389.

Alexopoulos, A. A., Karapanos, I. C., Akoumianakis, K. A., & Passam, H. C. (2017). Effect of gibberellic acid on the growth rate and physiological age of tubers cultivated from true potato seed. Journal of Plant Growth Regulation, 36(1), 1–10.

Aremu, A. O., Plaсkovа, L., Masondo, N. A., Amoo, S. O., Moyo, M., Novаk, O., Dolezal, K., & Staden, J. V. (2017). Regulating the regulators: Responses of four plant growth regulators during clonal propagation of Lachenalia montana. Plant Growth Regulation, 82(2), 305–315.

Cruz-Castilloa, J. G., Baldicchib, A., Frionib, T., Marocchic, F., Moscatellod, S., Proiettid, S., Battistellid, A., & Famianib, F. (2014). Pre-anthesis CPPU low dosage application increases Hayward kiwifruit weight without affecting the other qualitative and nutritional characteristics. Food Chemistry, 158(1), 224–228.

Froschle, M., Horn, H., & Spring, O. (2017). Effects of the cytokinins 6-benzyladenine and forchlorfenuron on fruit-, seed- and yield parameters according to developmental stages of flowers of the biofuel plant Jatropha curcas (Euphorbiaceae). Plant Growth Regulation, 81(2), 293–303.

Fu, Q., Niu, L., Zhang, Q., Pan, B-Z., He, H., & Xu, Z-F. (2014). Benzyladenine treatment promotes floral feminization and fruiting in a promising oilseed crop Plukenetia volubilis. Industrial Crops and Products, 59, 295–298.

Gonzatto, M. P., Boettcher, G. N., Schneider, L. A., Lopes, A. А., Junior, J. C. S., Petry, H. B., Oliveira, R. P., & Schwarz, S. F. (2016). 3,5,6-trichloro-2-pyridinyloxyacetic acid as effective thinning agent for fruit of Montenegrina mandarin. Ciеncia Rural, 46(12), 2078–2083.

Gouveia, E. J., Rocha, R. B., Galvеas, B., Ramalho, L. A. R., Ferreira, M. G. R., & Dias, L. A. S. (2012). Grain yield increase of physic nut by field-application of benzyladenine. Pesquisa Agropecuária Brasileira, 47(10), 1541–1545.

Javid, M. G., Sorooshzadeh, A., Sanavy, S. A. M. M., Allahdadi, I., & Moradi., F. (2011). Effects of the exogenous application of auxin and cytokinin on carbohydrate accumulation in grains of rice under salt stress. Plant Growth Regulation, 65(2), 305–313.

Khalid, S., Malik, A. U., Khan, A. S., Razzaq, K., & Naseer, M. (2016). Plant growth regulators application time influences fruit quality and storage potential of young kinnow mandarin trees. International Journal of Agriculture and Biology, 18, 623‒629.

Khodanitska, O. O., & Kuryata, V. G. (2011). Dija treptolemu na nasinnjevu produktyvnist’ i jakisni harakterystyky olii’ l’onu [The effect of treptolem on seed yield and quality characteristics of flaxseed oil]. Kormy i Kormovyrobnyctvo, 70, 54–59 (in Ukrainian).

Kuryata, V. G., Poprotska, I. V., & Rogach, T. I. (2017). Vplyv stymuljatoriv rostu ta retardantiv na utylizaciju rezervnoi’ olii’ prorostkamy sonjashnyku [The impact of growth stimulators and retardants on the utilization of reserve lipids by sunflower seedlings]. Regulatory Mechanisms in Biosystems, 8(3), 317–322 (in Ukrainian).

Li, Y., Zhang, D., Xing, L., Zhang, S., Zhao, C., & Han, M. (2016). Effect of exogenous 6-benzylaminopurine (6-BA) on branch type, floral induction and initiation, and related gene expression in Fuji apple (Malus domestica). Plant Growth Regulation, 79(1), 65–70.

Luo, Y., Yang, D., Yin, Y., Cui, Z., Li, Y., Chen, J., Zheng, M., Wang, Y., Pang, D., Li, Y., & Wang, Z. (2016). Effects of exogenous 6-BA and nitrogen fertilizers with varied rates on function and fluorescence characteristics of wheat leaves post anthesis. Scientia Agriculturalura Sinica, 49(6), 1060–1083.

Madzikane-Mlungwana, O., Moyo, M., Aremu, A. O., Plíhalovа, L., Doleal, K., Staden, J. V., & Finnie, J. F. (2017). Differential responses to isoprenoid, N6-substituted aromatic cytokinins and indole-3-butyric acid in direct plant regeneration of Eriocephalus africanus. Plant Growth Regulation, 82(1), 103–110.

Mesejo, C., Rosito, S., Reig, C., Martínez-Fuentes, A., & Agustí, M. (2012). Synthetic auxin 3,5,6-TPA provokes Citrus clementina (Hort. ex Tan) fruitlet abscission by reducing photosynthate availability. Journal of Plant Growth Regulation, 31(2), 186–194.

Mohammad, N. K., & Mohammad, F. (2013). Effect of GA3, N and P ameliorate growth, seed and fibre yield by enhancing photosynthetic capacity and carbonic anhydrase activity of linseed. Integrative Agriculture, 12(7), 1183–1194.

Muhammad, I., & Muhammad, A. (2013). Gibberellic acid mediated induction of salt tolerance in wheat plants: Growth, ionic partitioning, photosynthesis, yield and hormonal homeostasis. Environmental and Experimental Botany, 86, 76–85.

Piotrowska-Niczyporuk, А., & Bajguz, А. (2014). The effect of natural and synthetic auxins on the growth, metabolite content and antioxidant response of green alga Chlorella vulgaris (Trebouxiophyceae). Plant Growth Regulation, 73(1), 57–66.

Polyvanyj, S. V., & Kuryata, V. G. (2015). Dija treptolemu na morfogenez, produktyvnist’ ta jakisni harakterystyky maku olijnogo [Effects of treptolem on morphogenesis, productivity and qualitative characteristics of poppy oil]. Agrobiologija, 117(1), 65–72 (in Ukrainian).

Poprotska, I. V., & Kuryata, V. G. (2017). Features of gas exchange and use of reserve substances in pumpkin seedlings in conditions of skoto- and photomorphogenesis under the influence of gibberellin and chlormequat-chloride. Regulatory Mechanisms in Biosystems, 8(1), 317–322.

Rai, R. K., Tripathi, N., Gautam, D., & Singh, P. (2017). Exogenous application of ethrel and gibberellic acid stimulates physiological growth of late planted sugarcane with short growth period in subtropical India. Journal of Plant Growth Regulation, 36(2), 472–486.

Ren, B., Zhang, J., Dong, S., Liu, P., & Zhao, B. (2017). Regulations of 6-benzyladenine (6-BA) on leaf ultrastructure and photosynthetic characteristics of waterlogged summer maize. Journal of Plant Growth Regulation, 36(3), 743–754.

Ribeiro, D. M., Araújo, W. L., Fernie, A. R., Schippers, J. H. M., & Mueller-Roeber, B. (2012). Translatome and metabolome effects triggered by gibberellins during rosette growth in Arabidopsis. Journal Experimental Botany, 63(7), 2769–2786.

Rogach, T. I. (2009). Osoblyvosti morfogenezu i produktyvnist’ sonjashnyku za dii’ treptolemu [Particularity of morphogenesis and productivity of sunflower plants under the influence of treptolem]. Fiziologija Roslyn: Problemy ta Perspektyvy Rozvytku, 2, 680–686 (in Ukrainian).

Sugiura, D., Sawakami, K., Kojim, M., Sakakibara, H., Terashima, I., & Tateno, M. (2015). Roles of gibberellins and cytokinins in regulation of morphological and physiological traits in Polygonum cuspidatum responding to light and nitrogen availabilities. Functional Plant Biology, 42(4) 397–409.

Tubiс, L., Saviс, J., Mitiс, N., Milojeviс, J., Janosevi, D., Budimir, S., & Zdravkoviс-Koraс, S. (2016). Cytokinins differentially affect regeneration, plant growth and antioxidative enzymes activity in chive (Allium schoenoprasum). Plant Cell, Tissue and Organ Culture January, 124(1), 1–14.

Van Emden, H. F. (2008). Statistics for terrified biologists. Blackwell, Oxford.

Xiaotao, D., Yuping, J., Hong, W., Haijun, J., Hongmei, Z., Chunhong, C., & Jizhu, Y. (2013). Effects of cytokinin on photosynthetic gas exchange, chlorophyll fluorescence parameters, antioxidative system and carbohydrate accumulation in cucumber (Cucumis sativus) under low light. Acta Physiologiae Plantarum, 35(5) 1427–1438.

Xing, X., Jiang, H., Zhou, Q., Xing, H., Jiang, H., & Wang, S. (2016). Improved drought tolerance by early IAA- and ABA-dependent H2O2 accumulation induced by α-naphthaleneacetic acid in soybean plants. Plant Growth Regulation, 80(3), 303–314.

Yіldіrım, B., Yesiloglu, T., Іncesu, M., Kamiloglu, M. U., Сimen, B., & Tamer, S. (2012). Effects of 2,4-DP (2,4-dichlorophenoxypropionic acid) plant growth regulator on fruit size and yield of Valencia oranges (Citrus sinensis). New Zealand Journal of Crop and Horticultural Science, 40(1), 55–64.

Zhao, H., Cao, H., Ming-Zhen, P., Sun, Y., & Liu, T. (2017). The role of plant growth regulators in a plant aphid parasitoid tritrophic system. Journal of Plant Growth Regulation, 36(4), 868–876.