Evaluation of resistance of Japanese fibre banana cv. Itobasho (Musa balbisiana var. liukiuensis) to Banana bunchy top virus.

Abstract

FURUYA, N. 1,3 , KAWANO, S. 2,4 and NATSUAKI, K.T. In an evaluation of the susceptibility of three Musa species grown in Okinawa Island, Japan, to Banana bunchy top virus (BBTV), the virus was widely distributed among edible banana cv. Dwarf Cavendish and cv. Shima. However, bunchy top symptoms and BBTV infection were not observed and detected from all plants of fibre banana cv. Itobasho (Musa balbisiana var. liukiuensis) tested. Furthermore, none of the Itobasho plants were infected with BBTV via viruliferous banana aphids (Pentalonia nigronervosa Coq.) that had been propagated on BBTV-infected pseudostems, whereas 78% of the edible bananas were infected under the same conditions. Thus, Itobasho seems to have an immunity to BBTV but is not resistant to aphid infestation or colonization.(

Genetic structure and diversity of the Banana bunchy top virus population on Sumatra Island, Indonesia

“…As for the reason underlying this phenomenon, BBTV may adapt banana varieties that include a B genotype. Previous studies have shown that some banana varieties including the B genotype have resistance for BBTV (Hooks et al 2009;Furuya et al 2012). Perhaps, since there may have been some resistant bananas in our sample, the viruses infecting banana varieties including the B type genotype may have greater diversity than those infecting banana varieties including only the A genotype.…”

Banana bunchy top virus genetic diversity in Pakistan and association of diversity with recombination in its genomes

“…Banana pseudostem is waxy and banana aphid prefers to feed in pesudostem so the differences in wax content or composition between the two cultivars may lead to observed differences in virus transmission in their studied varieties. Furuya and colleagues (2012) [ 69 ] in a susceptibility study between Dwarf Cavendish (AAA) and Itobasho (BB) also observed reduced virus transmission in itobasho variety. Our analysis exhibited an excess of synonymous over nonsynonymous substitutions, indicating strong purifying (negative) selection as an additional mechanism constraining genetic variation [ 70 ].…”