Polyploidization of sexual diploid Brachiaria decumbens for intraspecific hybridization
Brachiaria decumbens (D), also known as signalgrass, is the most widely adapted forage grass in the tropics. It was first introduced to Brazil in the early 1950s and its best known cultivar, cv. Basilisk, quickly spread to the acid savannas of Latin America,covering millions of hectares.It is a natural tetraploid (4x) and apomictic genotype of good dry matter and seed production,even though it is susceptible to spittlebugs,the most widespread insect pest in tropical pastures.Breeding of this species was restricted to using 4x apomictic accessions as pollen donors in interspecific crosses, since sexual genotypes are diploid (2x). Earlier attempts of interploydic crosses were unsuccessful ( Ferguson and Crowder,1974; Hacker,1994).This paper is the first report of the use of in vitro culture and colchicine treatments in tetraploidizing sexual genotypes of signalgrass.
apomixis chromosome duplication forage breeding polyploidization signalgrass
C.B.Valle C.Simioni L.Jank R.M.S.Resende
Embrapa Beef Cattle,Caixa Postal 154,79002-970 Campo Grande,MS,Brazil Pos-Doc,CNPq Scholarship at Embrapa Beef Cattle Caixa Postal154,79002-970 Campo Grande,MS,Brazil
国际会议
呼和浩特
英文
2008-06-29（万方平台首次上网日期，不代表论文的发表时间）