Studies on some epidemiological and biochemical resistance parameters for powdery mildew disease in Indian mustard caused by Erysiphe cruciferarum Opiz. ex. Junell
| dc.contributor.advisor | Rathi, A.S. | |
| dc.contributor.author | Sunil H. S. | |
| dc.date.accessioned | 2019-02-06T06:47:07Z | |
| dc.date.available | 2019-02-06T06:47:07Z | |
| dc.date.issued | 2018 | |
| dc.description.abstract | Powdery mildew disease caused by Erysiphe cruciferarum is an important disease of Indian mustard (Brassica juncea) particularly in northern and north eastern states of India. Keeping in view the importance of disease present study has been carried out on epidemiology in relation to weather, sources of resistance and biochemical changes due to powdery mildew infection under in field conditions during rabi 2017-18 at CCS HAU, Hisar. Powdery mildew disease first appeared in third week of February on all the three varieties (RH 0749, RH 0406 and RH 9801) sown on 16th October and delayed by a week i.e. in the 1st week of March in all the varieties sown on 26th October and 8th November, when the temperature ranged between 27.3-29.4°C (maximum) and 9.4-13.5°C (minimum), while relative humidity (RH) range was 91.7-94.0 (morning) and 37-49% (evening). Wind speed during this period ranged from 1.1-2.7 km/ha, while sunshine range was 5.4-7.7 hours. Maximum disease progression in last two dates of sowing was observed from March 4th to March 13th, when the temperature ranged between 28.2-28.7°C (maximum) and 10.7-12.3°C (minimum), while RH ranged between 81.0-91.3% (morning) and 35.7-48.3% (evening). Wind speed and sunshine hour during this period was 2.2-2.5 km/hour and 4.9-7.7 hours, respectively. Temperature (maximum and minimum), wind speed and sunshine were positively correlated with per cent disease intensity, while relative humidity (morning and evening) and average vapour pressure (morning and evening) were negatively correlated with the per cent disease intensity and AUDPC increased with delay in time of sowing. The apparent rate of infection was high during initial stages of disease development, while it was negligible from 2nd week of March in all the varieties. Varieties RH 0749 showed less disease intensity followed by RH 0401 and RH 9801. Out of 148 genotypes screened under the artificial inoculation conditions, 5 genotypes (HNS 0901, Bio 902, BioYSR, DRMRIJ 12-48 and JM-6011) were resistant and 21 genotypes were moderately resistant, 55 genotypes were moderately susceptible and 31 genotypes were susceptible, while rest of the genotypes were highly susceptible. Slightly higher amount of chlorophyll ‘a’, chlorophyll ‘b’ and total chlorophyll and total sugars was found in healthy leaves of resistant (DRMRIJ 12-48) as compared to susceptible (RH 30) genotype. After infection amount of chlorophyll (a, b and total) and total sugars reduced gradually in both genotypes, but reduction was more in susceptible genotype particularly under inoculated conditions. The amount of phenols (total and OD) and the activities of POX and PPO were increased at higher rate in resistant as compared to susceptible one at the time of disease initiation. At the time of maximum disease intensity i.e. at 120 DAS, the activities of enzymes were more in resistant genotype under inoculated condition in comparison to un-inoculated condition. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810093817 | |
| dc.keywords | Indian mustard, Powdery mildew, Disease intensity, Epidemiology, AUDPC, Varietal reaction, Biochemical resistance | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | CCSHAU | en_US |
| dc.sub | Plant Pathology | en_US |
| dc.subject | null | en_US |
| dc.theme | Studies on some epidemiological and biochemical resistance parameters for powdery mildew disease in Indian mustard caused by Erysiphe cruciferarum Opiz. ex. Junell | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | Studies on some epidemiological and biochemical resistance parameters for powdery mildew disease in Indian mustard caused by Erysiphe cruciferarum Opiz. ex. Junell | en_US |
| dc.type | Thesis | en_US |