Population density of Meloidogyne graminicola in commercial rice plantations and behavior of advanced lines in the province of Los Ríos, Ecuador
DOI:
https://doi.org/10.32480/rscp.2021.26.1.64Keywords:
rice, advanced lines, Meloidogyne graminicola, Oryza rufipogon, sustainable managementAbstract
Populations of Meloidogyne graminicola in commercial rice plantations in Ecuador and resistance of F5 rice lines derived from interspecific crosses of Oryza sativa L. ssp. japonica x Oryza rufipogon G. (PUYÓN) and from intraspecific crosses from Oryza sativa L. ssp. japonica lines to the M. graminicola were determined. Population density evaluations were conducted on roots and soil of rice sampled from 20 commercial plantation areas while resistance research was assessed under controlled nursery conditions. A total of 50 advanced F5 rice lines were inoculated with 2,500 J2 M. graminicola with a commercial variety, INIAP 15, susceptible to the attack of M. graminicola. Results showed remarkably high incidence of M. graminicola in 13 out of 20 investigated plantation areas. Response to M. graminicola among the inoculated 50 advanced Lines F5 showed that four (4) Lines 32 (PUYÓN / JP002 P11 - 10 P74), 5 (PUYÓN / JP002 P8 - 20 P13), 31 (PUYÓN / JP002 P11 - 10 P22) and 2 (PUYÓN / JP002 P8 - 20 P14) presented a low population density of M. graminicola / 10 g of roots. Analysis on Reproduction index showed that the least number of times the nematode multiplied was 2 times in Line 32 (PUYÓN / JP002 P11 - 10 P22) while more than 2 times in the other lines. In conclusion, F5 line from interspecific crosses of Oryza sativa L. ssp. japonica x Oryza rufipogon G. (PUYÓN) has quantitative nematode resistance with Line 32 (PUYÓN / JP002 P11-10 P74) had the lowest nematode attack, suggesting that this line is promising for crop production in nematode prevalent areas. Studies assessing the production performance of these F5 rice lines in the very high nematode identified areas and measures to control the prevalence of nematodes are recommended.
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