A resistance study on sugarcane commercial varieties against ratoon stunting disease using staining by transpiration method

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Published: May 31, 2013
Keywords:
sugarcane, Clavibacter xyli, disease resistance, pest control methods, staining by transpiration

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J. R. Pérez
Estación Provincial de Investigaciones de la Caña de Azúcar (EPICA)

Abstract

Ratoon stunting (RSD) is probably the most important sugarcane disease affecting a great number of productive varieties. The causal agent is Clavibacter xyli subsp. xyli lodged in xylem vessels. Seed hydrothermal treatment is commonly applied for its control, but it can not fully remove the pathogen. However, after a thermal treatment a yield increment is observed, which has been considered as a result of an effective
sanitation. On the other hand, the visual diagnosis of this disease is difficult, since external symptoms are confused with other pathologies; thus, other diagnostic techniques were developed enabling to detect disease appearance. This study applied staining by transpiration method (STM) to early estimate an effective sanitation by hydrothermotherapy. A differentiated varietal performance against RSD was proved, it ranging from a little difference between treated and inoculated plants in My5514 until a very marked difference in C120-78. Percentage of functional vessels (%VF) confirmed the results from other investigations in My5514 (resistant) and CP31-294 (susceptible). Varietal sanitation in Ja60-5, C1051-73 and CP52-43 was analyzed through phase contrast (CF) and STM when diseased stalks were thermally treated by means of different combinations of times and temperatures. Bacterial appearance was recorded by CF; nevertheless, when studying % VF in every case, it surpassed 85 % after submitted to a treatment under 50.5oC for two hours. A nice correlation was registered between weight and % VF in treated and inoculated My5514 and C120-78. These results prove this useful method to evaluate sanitation against RSD, which can be taken into consideration for seed bank qualification.

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How to Cite
Pérez, J. R. (2013). A resistance study on sugarcane commercial varieties against ratoon stunting disease using staining by transpiration method. Cultivos Tropicales, 22(2), 39–42. Retrieved from https://ediciones.inca.edu.cu/index.php/ediciones/article/view/698
Issue
Vol. 22 No. 2 (2001)
Section
Original Article

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