ALVES, V. M. C.

BAHIA FILHO, A. F. C.

OLIVEIRA, A. C. de

PITTA, G. V. E.

SANTOS, F. C.

SCHAFFERT, R. E.

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..liliIlilito11!l'••11PERFORMANCE OF NEW CYTOPLASMIC MALE STERILE SORGHUM LINESDEVELOPED FOR TOLERANCE TO TOXIC LEVELS OF ALUMINUM IN ACID SOILS.R.E. Schaffert'", V.M.C. Alves', A.F.C. Bahia FoI, G.V.E. Pitta', F.G. Santos and C.A. deOliveira". IEMBRAPAlCNPMS, CP 151, 35701-970 Sete Lagoas, MG, Brazil, 2Fellowship/CNPq/CNPMS.•••••••••li••••••••li11••!li11I•li••lili•li11I••lililirili••••••••••••••li•••••li='I';r-IliThe fertility non-restoring line from the Texas A&MlUSDA Sorghum Conversion Program, IS7173c(SC 283), a genetic source for tolerance to AI toxicity in acid soils was used to incorporatethis trait into various sources of non-restoring lines with the objective of developing commercialmale sterile lines tolerant to AI toxicity. The susceptible male sterile B-lines, BR 007, RedIan,Wheatland, DwarfRedIan, and SC 566 were crossed with SC 283. Several hundred head to row F4families visually selected for desirable agronomic traits were selected for AI tolerance under acidsoil conditions (45% AI saturation) at the National Maize and Sorghum Research Center (CNPMS)of the Brazilian Agriculture Research Corporation (EMBRAPA). Progenies were selected for rootdevelopment based on their reaction to moisture stress during prolonged periods without rain.Turgid plants were assumed to have a better developed root system than moisture stressed plantsand were classified as having AI tolerance. Selected F7 progenies were backcrossed to a source ofcytoplasmic male sterility to develop respective A lines for each selected B line progeny. The Blines of 55 selected A and B pairs were evaluated for tolerance to AI toxicity using reiativeseminal root growth (RSRG) of seedIings in nutrient solution with 4ppm of AI for seven days asthe indicator. The average RSRG of the tolerant (SC283) and susceptible (BR 007B) checks were50.6% and 6.6% respectively. The RSRG of the 55 selected progenies from 16 family groupsranged from 2.8% to 75.5%. Eleven progenies from four family groups were susceptible. Tolerantprogenies selected from families derived from RedIan and Dwarf Redlan crosses had lower RSRGthan tolerant progenies from families derived from BR 007 and Wheatland. Head to row progeniesfrom three groups segregated for tolerance and susceptible reaction, confirming three nearisogenic (96.9%) pairs for this trait. The reiative high frequency of segregation afie r the S5generation suggests that one or a few major genes control this characteristic.11Ili.,- - - - - - - - - - -11I

Performance of new cytoplasmic male sterile sorghum lines developed for tolerance to toxic levels of aluminum in acid soils.

http://www.alice.cnptia.embrapa.br/alice/bitstream/doc/472505/1/Performancenew.pdf

Performance of new cytoplasmic male sterile sorghum lines developed for tolerance to toxic levels of aluminum in acid soils.

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