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Revista de Protección Vegetal

Print version ISSN 1010-2752On-line version ISSN 2224-4697

Abstract

DUARTE LEAL, Yanisia; MARTINEZ COCA, Benedicto; CAFE FILHO, Adalberto C.  and  BASSAY BLUM, Luiz Eduardo. Physiological and cultural characterization and mycelial compatibility of Sclerotium sp. isolates from seven plant hosts. Rev. Protección Veg. [online]. 2020, vol.35, n.1, e08.  Epub Apr 01, 2020. ISSN 1010-2752.

The objectives of the work were to culturally and physiologically characterize 15 isolates of Sclerotium sp. from beans (Phaseolus vulgaris L.), chickpea (Cicer arietinum L.), tomato (Solanum lycopersicum L.), taro [Colocasia esculenta (L.) Schott], garlic (Allium sativum L.), and ornamental plants [Neomarica caerulea (Ker Gawl.) Sprague and Hydrocotyle sp.], from Cuba and Brazil, under different lighting conditions and determine the presence of their Mycelial Compatibility Groups (GCM). For this, the inoculated Petri dishes containing Papa Dextrose Agar (PDA) culture medium were placed under three lighting regimes [constant darkness (OC), alternating light (LA), and constant light (LC)] at 28 ± 2°C. The mycelial growth diameter and the surface texture and color of the colonies were evaluated in each isolate, as well as the number, weight and diameter of sclerotia under each condition. Confrontation tests were used to determine the existence of GCM. The highest production of sclerotia was under LC, and the lowest under OC. Mycelial compatibility was observed between the colonies of isolates from the same host (No. 1 and 9 of C. arietinum and No. 5 and 6 of P. vulgaris) and between isolates from different hosts (P. vulgaris - S. lycopersicum and A. sativum - N. caerulea). Five GCM were obtained, GCM- I (No. 1 and 9), GCM-II (No. 5 and 6), GCM-III (No. 10 and 11), GCM-IV (No. 10 and 12), and GCM-V (No. 13 and 14).

Keywords : phenotypic variability; mycelial compatibility group; sclerotia.

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