TAILIEUCHUNG - báo cáo khoa học: " Is the basal area of maize internodes involved in borer resistance?"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Is the basal area of maize internodes involved in borer resistance? | Santiago et al. BMC Plant Biology 2011 11 137 http 1471-2229 11 137 BMC Plant Biology RESEARCH ARTICLE Open Access Is the basal area of maize internodes involved in borer resistance Rogelio Santiago Ana Butrón Pedro Revilla and Rosa Ana Malvar Abstract Background To elucidate the role of the length of the internode basal ring LIBR in resistance to the Mediterranean corn borer MCB we carried out a divergent selection program to modify the LIBR using two maize synthetic varieties EPS20 and EPS21 each with a different genetic background. We investigated the biochemical mechanisms underlying the relationship between the LIBR and borer resistance. Selection to lengthen or shorten the LIBR was achieved for each synthetic variety. The resulting plants were analyzed to determine their LIBR response growth yield and borer resistance. Results In the synthetic variety EPS20 Reid germplasm reduction of the LIBR improved resistance against the MCB. The LIBR selection was also effective in the synthetic variety EPS21 non-Reid germplasm although there was no relationship detected between the LIBR and MCB resistance. The LIBR did not show correlations with agronomic traits such as plant height and yield. Compared with upper sections the internode basal ring area contained lower concentrations of cell wall components such as acid detergent fiber ADF acid detergent lignin ADL and diferulates. In addition some residual 2 4-dihydroxy-7-methoxy- 2H -1 4-benzoxazin-3- 4H -one DIMBOA a natural antibiotic compound was detected in the basal area at 30 days after silking. Conclusion We analyzed maize selections to determine whether the basal area of maize internodes is involved in borer resistance. The structural reinforcement of the cell walls was the most significant trait in the relationship between the LIBR and borer resistance. Lower contents of ADF and ADL in the rind of the basal section facilitated the entry of larvae in this area in both synthetic varieties .

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