Resistance to Mirid Bug Creontiades Biseratense (Distant) in Cotton

Abstract

A field experiment was carried out in the AICRP on Cotton, Haradanahalli Farm, Chamarajanagar, Karnataka to know the association of morphological characters of 15 cotton genotypes (different resistance category) influencing resistance to mirid bug, Creontiades biseratense. Cotton morphological parameters viz., trichome density on leaves, squares and midvein showed a significance difference with the genotypes and the higher incidence of mirid bug was recorded on genotypes having more trichome density. Similarly, genotypes having higher boll rind thickness and length of petiole recorded the higher incidence. of C. biseratense. There was a significant positive correlation between C. biseratense incidence and trichomes on leaves (r = 0.90**), trichomes on squares (r = 0.89**), trichomes on midvein (r = 0.91**), boll rind thickness (0.80**) and length of petiole (r = 0.60*). However thickness of leaf showed the non-significant negative difference among the genotypes (r = -0.03).

Rice-Magnaporthe transcriptomics reveals host defense activation induced by red seaweed-biostimulant in rice plants

“…Previous reports have confirmed that seaweed biostimulants act indirectly on plant's metabolism by triggering several signaling cascades that initiate responses leading to the alleviation of various stresses and, consequently, enhanced growth and performance (Saeger et al, 2020;Banakar et al, 2022). Considering the devastating nature of rice blast disease, environmentally sustainable methods are more appealing in light of the public concern about using chemical fungicides in agricultural production (Sahana et al, 2022) Kappaphycus alvarezii seaweed extracts have been known for their plant biostimulant and stress alleviation activities on various crops (Kumar et al, 2019). However, very few reports are available showing its impact at the molecular level, which is crucial in identifying the mechanism of action of seaweed biostimulants on plants (Trivedi et al, 2021).…”

“…The experiment was laid out with five treatments subjected to priming of three-week-old plants with biostimulants viz., 0 h (before priming or inoculation); MG-01 challenge inoculation without priming; T 1 , priming of plants with LBD1 (2 ml L −1 ) and challenge inoculation with MG-01; T 2 , LBD1 (2 ml L −1 ); T 3 , and water control; T 4 . The dose of the seaweed biostimulant was determined, as described in our previous study (Sahana et al, 2022). The inoculated plants were placed in the incubator at 25 °C for 24 h and then moved to the mist chamber with the relative humidity maintained at 90%.…”

“…These bioactive molecules induce an oxidative burst and various defense pathways mediated through salicylic acid, jasmonic acid, and ethylene (Vera et al, 2011). This reaction cascade leads to the upregulation of pathogenesis-related proteins (PR proteins), various defense enzymes, and increased phenolic compounds (Sahana et al, 2022). Several methods have been employed to study rice and M. oryzae interaction (Mahesh et al, 2021).…”