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http://krishi.icar.gov.in/jspui/handle/123456789/66935| Title: | Combined application of ascorbic acid and endophytic N-fixing Azotobacter chroococcum Avi2 modulates photosynthetic efficacy, antioxidants and growth-promotion in rice under moisture deficit stress |
| Other Titles: | Not Available |
| Authors: | Kumar U Kaviraj M Rout S Chakraborty K Swain P Nayak PK Nayak AK |
| ICAR Data Use Licennce: | http://krishi.icar.gov.in/PDF/ICAR_Data_Use_Licence.pdf |
| Author's Affiliated institute: | ICAR-National Rice Research Institute, Cuttack |
| Published/ Complete Date: | 2021-06-10 |
| Project Code: | Not Available |
| Keywords: | Moisture deficit stress, Ascorbic acid, Azotobacter chroococcum Avi2, Chlorophyll fluorescence-imaging, RT-PCR-based nifH gene abundance, Rice |
| Publisher: | Elsevier |
| Citation: | Kumar, U., Kaviraj, M., Rout, S., Chakraborty, K., Swain, P., Nayak, P.K. and Nayak, A.K., 2021. Combined application of ascorbic acid and endophytic N-fixing Azotobacter chroococcum Avi2 modulates photosynthetic efficacy, antioxidants and growth-promotion in rice under moisture deficit stress. Microbiological Research, p.126808. |
| Series/Report no.: | Not Available; |
| Abstract/Description: | This group has previously reported the role of ascorbic acid (AA) as an antioxidant for survivability and ability to enhancing diazotrophic efficacy in Azotobacter chroococcum Avi2 under hydrogen peroxide (H2O2) stress. However, the present study showed the combined application of AA and Avi2 in drought-susceptible (IR64 and Naveen) and drought-tolerant (Ankit and Satyabhama) rice cultivars to determine their photosynthetic efficacy (chlorophyll fluorescence-imaging), antioxidants, and plant growth-promotion (PGP) under moisture deficit stress (MS, 60 kPa). The results indicated that combined application of AA and Avi2 significantly (p < 0.05) increased the total chlorophyll, relative water content, electrolytic leakage, super oxide dismutase, and catalase activities in all rice cultivars as compared to other MS treatments, whereas stress indicators like proline and H2O2 contents were proportionally increased under MS and their concentration were normalized under combined application of AA and Avi2. Photochemical quenching, non-photochemical quenching, photosynthetic electron transport rate, and the effective quantum efficiency were found to be increased significantly (p < 0.05) in Avi2 + AA as compared to other MS treatments. Moreover, rice roots harbored significantly (p < 0.05) higher copy number of nifH gene in Avi2 + AA treatment followed by Avi2 compared to flooded control and other MS treatments. Combined application of AA and Avi2 also increased the grain yield significantly (p < 0.05) by 7.09 % and 3.92 % in drought-tolerant (Ankit and Satyabhama, respectively) and 31.70 % and 34.19 % in droughtsusceptible (IR64 and Naveen, respectively) rice cultivars compared to MS treatment. Overall, the present study indicated that AA along with Avi2 could be an effective formulation to alleviate MS vis `a vis enhances PGP traits in rice. |
| Description: | Not Available |
| ISSN: | Not Available |
| Type(s) of content: | Research Paper |
| Sponsors: | Not Available |
| Language: | English |
| Name of Journal: | Microbiological Research (Zentralblatt f?r Mikrobiologie) |
| NAAS Rating: | 9.97 |
| Volume No.: | 250 |
| Page Number: | 126808 |
| Name of the Division/Regional Station: | Crop Production Division |
| Source, DOI or any other URL: | https://doi.org/10.1016/j.micres.2021.126808 |
| URI: | http://krishi.icar.gov.in/jspui/handle/123456789/66935 |
| Appears in Collections: | CS-NRRI-Publication |
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