Biological and biochemical diversity in different biotypes of spotted stem borer, Chilo partellus (Swinhoe) in India

Abstract

Because of variation in incidence and severity of damage by Chilo partellus (Swinhoe) in different geographical regions, it is difficult to identify stable sources of resistance against this pest. Therefore, the present studies were undertaken on biological attributes (damage in resistant and susceptible genotypes, survival and development) and biochemical profiles (amino acids and lipophilic compound) of C. partellus populations from eight geographical regions to understand it’s population structure in India. There was a significant variation in biological attributes and biochemical profiles of C. partellus populations from different geographical regions. Based on virulence and biological attributes, similarity index placed the C. partellus populations in five groups. Likewise, lipophilic and amino acid profiling also placed the C. partellus populations in five groups. However, the different clusters based on biological and biochemical attributes did not include populations from the same regions. Similarity index based on virulence, biological attributes, and amino acids and lipophilic profiles placed the C. partellus populations in six groups. The C. partellus populations from Hisar, Hyderabad, Parbhani and Coimbatore were distinct from each other, indicating that there are four biotypes of C. partellus in India. The results suggested that sorghum and maize genotypes need to be tested against these four populations to identify stable sources of resistance. However, there is a need for further studies to establish the restriction in gene flow through molecular approaches across geographical regions to establish the distinctiveness of different biotypes of C. partellus in India.

Improved Captures of the Invasive Brown Marmorated Stink Bug, Halyomorpha halys, Using a Novel Multimodal Trap

“…Hence, further investigations would help clarify whether leaving trapped adults for a prolonged time would increase trap efficacy, or otherwise, decrease it due to possible emission by trapped individuals of defensive compounds (e.g., aldehydes, with demonstrated repellent activities on conspecifics) [ 55 ]. Another aspect is that insect populations of diverse geographical origins may exhibit different behaviour (e.g., the stem borers Sesamia nonagroides Lefèbvre [ 56 , 57 ] and Chilo partellus (Swinhoe) [ 58 ]). Hence, whether different populations of H. halys similarly respond to UV-A and visible wavelengths must be verified.…”

Diapause in <i>Chilo partellus</i>: A Research Journey

“…There is significant phenotypic variation in adults of C. partellus under diverse ecological regions of India (Dhillon et al, 2022b). The biological performance and biochemistry of the insect from different ecological conditions vary while feeding on diverse host plant genotypes, and plant biochemistry is also differentially expressed under different climatic conditions, thus leading to variable herbivore-plant associations (Dhillon et al, 2021;Samal et al, 2022). There is variation in damage potential, biological attributes and biochemical profiles of C. partellus populations from different geographical regions infesting sorghum and maize in India (Dhillon et al, 2021).…”

“…The biological performance and biochemistry of the insect from different ecological conditions vary while feeding on diverse host plant genotypes, and plant biochemistry is also differentially expressed under different climatic conditions, thus leading to variable herbivore-plant associations (Dhillon et al, 2021;Samal et al, 2022). There is variation in damage potential, biological attributes and biochemical profiles of C. partellus populations from different geographical regions infesting sorghum and maize in India (Dhillon et al, 2021). The similarity index based on virulence, biological attributes, and amino acids and lipophilic profiles placed the C. partellus populations in six groups.…”

“…The similarity index based on virulence, biological attributes, and amino acids and lipophilic profiles placed the C. partellus populations in six groups. The C. partellus populations from Hisar, Hyderabad, Parbhani and Coimbatore were distinct from each other, suggesting that there are four biotypes of C. partellus in India (Dhillon et al, 2021). As the type and intensity of diapause exercises a profound effect on post-diapause development and reproduction (Dhillon and Hasan 2018), it is possible that progenies from aestivation, hibernation and nondiapause C. partellus display differential host preference, damage and larval survival on the known resistant and susceptible host crop genotypes.…”

Diapause‐induced shift in the content of major carbohydrates in Chilo partellus (Swinhoe)

“…Several aspects of diapause have been investigated like environmental factors determining diapause , reproductive physiology (Dhillon & Hasan, 2018;, different biotypes and amino-lipophilic profiles (Dhillon et al, 2021;Samal et al, 2022;Tanwar et al, 2021), and genetic regulation of diapause in C. partellus (Dhillon et al, 2020). However, there is poor understanding on metabolic Thereafter, the remaining hibernating larvae were exposed to hibernation termination treatment conditions, that is, fresh diet and at 27 ± 1°C, 70±5% RH, and 12L:12D, to obtain the pupae from hibernation treatment, and the 24 h old pupae were collected for the studies.…”