SALINE AND WATER STRESS ON GERMINATION AND EARLY SEEDLING GROWTH OF <i>Toona ciliata</i>M. ROEM. var. <i>australis</i>
DOI:
https://doi.org/10.5902/1980509831633Keywords:
Australian red cedar, PEG 6000, NaCl.Abstract
The Toona ciliata var. australis is a tree species which yields a very high-quality timber for furniture and is unaffected by Hypsipyla grandella, a pest that attacks monoculture plantations of native species similar to Toona ciliata. It has a close relationship with water availability, occurring mainly in humid forest in its natural habitat. In commercial plantations this is an important limitation to the establishment and initial growing of Toona ciliata. In the last decades, the use of Toona ciliata in commercial plantations has increased in Brazil, however, there is little knowledge about the effect of adverse environments on seed germination and early seedling growth. This study aimed to evaluate the effects of water and saline stress on germination and early seedlings growth of Toona ciliata. Osmotic solutions were prepared with, or NaCl, or PEG 6000, in the following osmotic potentials: -0.1; -0.2; -0.3; -0.4; -0.5; -0.6; -0.9; -1.2 and -1.5 MPa. For the control treatment, it was only used sterile water. The seeds were submitted to the germination test in which the germitest paper was moistened with the relative osmotic solution. The incubation was realized in a germination chamber at 25 ± 2 °C with 16 h light of photoperiod. The experimental design was completely randomized, arranged in a factorial design 2 × 10 (osmotic agent × osmotic potential and control), with four repetitions of 50 seeds each. With the reduction on the osmotic potential was observed lower germination, number of normal seedlings, fresh weight, seedling length and higher number of hard seeds, being the effect of PEG 6000 more severe. The germination and number of abnormal seedlings was higher under NaCl effect than PEG 6000. It can be concluded that germination and early seedling growth of Toona ciliata are affected by both saline and water stress, being more sensitive under water stress and with higher probability of developing abnormal seedlings under saline stress.
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References
BEGUM, M. A. J.; SELVARAJU, P.; VENUDEVAN, B. Saline stress on seed germination. Scientific Research and Essays, [s.l.], v. 8, n. 30, p. 1420-1423, 2013.
BETONI, R.; SCALON, S. P. Q.; MUSSURY, R. M. Salinidade e temperatura na germinação e vigor de sementes de mutambo (Guazuma ulmifolia Lam.) (Sterculiaceae). Revista Árvore, Viçosa, MG, v. 35, n. 3, p. 605-616, 2011.
BEWLEY, J. D. et al. Seeds: physiology of development, germination and dormancy. 3rd ed. New York: Springer, 2013. 392 p.
BOLAND, D. J. et al. Forest trees of Australia. 5th ed. Victoria: CSIRO Publishing, 2006. 769 p.
BUFALINO, L. et al. Particleboards made from Australian red cedar: processing variables and evaluation of mixed-species. Journal of Tropical Forest Science, Kuala Lumpur, v. 24, n. 2, p. 162–172, 2012.
BYGRAVE, F. L.; BYGRAVE, P. L. Growing Australian red cedar and other Meliaceae species in plantation. Canberra: RIRDC, 2005. 60 p.
BRAGA, L. F. et al. Germinação de sementes de pinho-cuiabano sob deficiência hídrica com diferentes agentes osmóticos. Scientia Forestalis, Piracicaba, v. 36, n. 78, p. 157-163, 2008.
BRASIL. Ministério da agricultura e Reforma Agrária. Secretaria Nacional de Defesa Agropecuária. Regras para análise de sementes. Brasília: SNDA, 2009. 399 p.
CAVALLARO, V. et al. Evaluation of variability to drought and saline stress through the germination of different ecotypes of carob (Ceratonia siliqua L.) using a hydrotime model. Ecological Engineering, Oxford, v. 95, p. 557-566, 2016.
DODD, G. L.; DONOVAN, L. A. Water potential and ionic effects on germination and seedling growth of two cold desert shrubs. American Journal of Botany, St. Louis, v. 86, n. 8, p. 1146-1153, 1999.
DORDEL, J. et al. Effects of nurse-tree crop species and density on nutrient and water availability to underplanted Toona ciliata in northeastern Argentina. Canadian Journal of Forest Research, Ottawa, v. 41, p. 1754-1768, 2011.
DORDEL, J.; SEELY, B.; SIMARD, S. W. Relationships between simulated water stress and mortality and growth rates in underplanted Toona ciliata Roem. in subtropical Argentinean plantations. Ecological Modelling, Amsterdam, v. 222, n. 17, p. 3226-3235, 2011.
ELIAS, S. G. et al. Seed testing: principles and practices. East Lansing: Michigan State University Press, 2012. 354 p.
FREIRE, A. L. O. Fixação do nitrogênio, crescimento e nutrição mineral de leucena sob condições de salinidade. 2000. 92 f. Tese (Doutorado) – Universidade Estadual Paulista, Jaboticabal, 2000.
HSIAO, T. C.; XU, L. K. Sensitivity of growth of roots versus leaves to water stress: biophysical analysis and relation to water transport. Journal of Experimental Botany, Oxford, v. 51, n. 350, p. 1595-1616. 2000.
KAYA, M. D. et al. Seed treatments to overcome salt and drought stress during germination in sunflower (Helianthus annuus L.). European Journal of Agronomy, Amsterdam, v. 24, n. 4, p. 291-295, 2006.
MANGIALAVORI, A. et al. Dasometria en plantaciones comerciales de toona (Toona ciliate var. australis) em la Província de Salta. In: DÉCIMAS JORNADAS TÉCNICAS FORESTALES Y AMBIENTALES, 2003. Eldorado. Anais... Eldorado: Facultad de Ciências Forestales, 2003.
MARTINS, C. C.; PEREIRA, M. R. R.; LOPES, M. T. G. Germinação de sementes de eucalipto sob estresse hídrico e salino. Bioscience Journal, Uberlândia, v. 30, n. 1, p. 318-329, 2014.
MICHEL, B. E.; KAUFMANN, M. R. The osmotic potential of polyethylene glycol 6000. Plant Physiology, Lancaster, v. 51, n. 6, p. 914-916, 1973.
PELEGRINI, L. L. et al. Efeito do estresse hídrico simulado com NaCl, manitol e PEG (6000) na germinação de sementes de Erythrina falcata Benth. Ciência Florestal, Santa Maria, v. 23, n. 2, p. 511-519, 2013.
TAIZ, L.; ZEIGER, E. Plant physiology. 3th ed. Sunderland: Sinauer, 2010. 782 p.
WEST, P. W. Growing plantation forests. 2nd ed. [s. l.]: Springer International Publishing, 2014. 329 p.
ZHU, J. et al. Effects of drought stresses induced by polyethylene glycol on germination of Pinus sylvestris var. mongolica seeds from natural and plantation forests on sandy land. Journal of Forest Research, Tokyo, v. 11, n. 5, p. 319-328, 2006.
