REACTION OF AROMATIC AND GLUTINOUS RICE GENOTYPES AGAINST SHEATH ROT (Sarocladium oryzae) DISEASE AND ITS MANAGEMENT WITH IDM MODULE
Loading...
Date
2017-07
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
AAU, Jorhat
Abstract
Sheath rot of rice caused by Sarocladium oryzae (Sawada) Gams and Hawksworth, has gained the status of major disease of rice, and yield losses varies from 9.6 to 85%. The present investigation was under taken to identify the resistant genotypes/cultivars as a donor gene for the development of HYV and to evaluate the efficacy of different IDM Modules for management of sheath rot of rice. The sheath rot disease sample was collected from the rice field of Regional Agriculture Research Station, Titabar. The isolates were cultured, purified and mass culture was prepared in half boiled rice grain, and single grain insertion method was followed for inoculation in aromatic and glutinous rice genotypes/ cultivars. Among the genotypes/ cultivars that were screened, eight entries showed resistant reaction from aromatic rice and five entries showed resistant reaction from glutinous rice genotypes/ cultivars. The physiological parameters were evaluated in both resistant and susceptible genotypes/ cultivars of both aromatic and glutinous rice. The resistant entries possess a higher concentration of phenol, protein and lower concentration of starch and sugar as compared to the susceptible one. The total phenol concentration was increased in, Resistant (R), Moderately resistant (MR), Moderately susceptible (MS) and decreased in susceptible genotypes/ cultivars after infection. Similarly, protein, starch, and TSS were found to be decreased in all the categories of genotypes/ cultivars (R, MR, MS, S). However, maximum reduction was observed in susceptible genotypes/ cultivars after infection. The interaction among the stem attacking fungal pathogens showed that Sarocladium oryzae suppresses the growth of Rhizoctonia solani and Sclerotium oryzae. in both in vitro and in vivo, while Sclerotium oryzae was more sensitive against Sarocladium oryzae as compared to Rhizoctonia solani. Among the modules that were evaluated for management of sheath rot disease of aromatic and glutinous rice. PDI and PDS were significantly reduced and increase of growth parameters and yield, in the entire module as compared to the inoculated control. However, the maximum reduction of PDI, PDS and increase of growth parameters and yield were recorded in Module- 2, where seeds were treated with carbendazim @ 2g/ kg of seed, soil application of Pseudomonas fluorescence @ 2.5kg/ha (2.5kg +50kg FYM) and 50% of potash of recommended dose at tillering stage along with Foliar spray with Carbendazim @ 0.2% after 30 days of transplanting and Foliar spray with Bioveer @ 2% at booting stage.
Description
Keywords
null