12 research outputs found

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    Not AvailablePlanthoppers, such as brown planthopper (BPH) and white backed planthopper (WBPH) are the most important destructive pests of rice. Even though 40 resistance genes for BPH and 19 genes for WBPH have been identifed from different rice genotypes and its wild relatives, most of these genes are ineffective in India. In our study a breeding line RP2068 was identifed as resistant to both the planthopper. Based on the molecular allelism test with reported linked markers and RT-PCR validation for reported candidate genes suggested that the gene present in RP2068 are new genes/QTLs. No gene has been mapped yet on chromosome# 1 against the WBPH, RP2068 may have new gene(s) conferring resistance.Not Availabl

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    Not AvailableThe Asian rice gall midge (ARGM) has emerged as a model gall forming pest of rice. The ARGM infestation of rice results in failure of panicle formation and economic loss. Understanding the molecular basis of ARGM-rice interactions is very crucial in order to control this devastating pest of rice. The current investigation was devised to identify bacterial communities present in the ARGM and in addition the bacterial diversity in the maggots during their interaction with susceptible or resistant rice varieties. Sequencing of 16S rRNA bacterial gene (V3-V4 region) revealed differences in the microflora of the ARGM maggots feeding on susceptible or resistant rice hosts. Results revealed that Wolbachia was the predominant bacterium in pupae and adults while Pseudomonas was predominant in maggots. Further, we observed that members of proteobacteria were predominant across all the samples. There was high species diversity in maggots isolated from susceptible rice and a high representation of unclassified bacteria in maggots isolated from resistant rice. This is the first study that reports variation of microbiome of the ARGM, based on host phenotype from which it was isolated, and results suggest that these variations could have an important role in host’s susceptibility.Not Availabl

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    Thirty three genotypes including resistant check, PTB-33 and susceptible check, TN1 were evaluated under field and glasshouse conditions along with studies on mechanisms of resistance against West Godavari brown plant hopper (BPH) population. The genotypes, PTB-33, RP Bio 4918-230S, RP 2068-18-3-5 and Rathu Heenathi were resistant in seedling stage in glasshouse and showed high level of resistance under field condition. Similarly, these genotypes had high level of antixenosis, antibiosis and tolerance mechanisms which was reflected by lower nymphal survival, prolonged nymphal duration, more macropterous adults, lower honeydew excretion and more days to wilt. Two genotypes viz., OM 4498 and IR-62 showed moderate levels of field resistance. The other 26 genotypes were susceptible to West Godavari BPH population.Thirty three genotypes including resistant check, PTB-33 and susceptible check, TN1 were evaluated under field and glasshouse conditions along with studies on mechanisms of resistance against West Godavari brown plant hopper (BPH) population. The genotypes, PTB-33, RP Bio 4918-230S, RP 2068-18-3-5 and Rathu Heenathi were resistant in seedling stage in glasshouse and showed high level of resistance under field condition. Similarly, these genotypes had high level of antixenosis, antibiosis and tolerance mechanisms which was reflected by lower nymphal survival, prolonged nymphal duration, more macropterous adults, lower honeydew excretion and more days to wilt. Two genotypes viz., OM 4498 and IR-62 showed moderate levels of field resistance. The other 26 genotypes were susceptible to West Godavari BPH populationNot Availabl
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