Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges &
Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
parts of North-Eastern region of India based on root architecture for their tolerance to
waterlogged condition at vegetative stage.
Methodology
A total of 37 inbred lines (32 from ICAR, Sikkim Centre and 5 from ICAR-IIMR, Ludhiana)
were used for the present study. The evaluation of landraces for waterlogging tolerance at V 5-
6 stage was undertaken under 2 sets of experiments viz., field and microcosm in 2 replications
at Research farm of ICAR-RC-NEH Region, Sikkim Centre during 2022. For screening,
artificial flooding was provided at V 5-6 stage to a depth of 20cm above the soil surface
continuously for 15 days and data are recorded based on maize Shovelomics. The “Response
Coefficient” (RC) as phenotypic plasticity index (Poorter and Nagel 2000, Abenavoli et al.
2016) and Waterlogging Tolerance Index (WTC) (Liu et al. 2010) were calculated.
Results
Root scanner images of the roots of inbred lines showed sharp differences between the control
and waterlogged conditions. Based on visual scoring of root architecture using Shovelomics,
score ranged from 1 to 9 for the traits brace roots angle (BA), brace roots branching density
(BB), crown roots number (CN), crown root s angle (CA) and crown roots branching (CB).
Some of the promising lines identified based on WTC and RC values from the 1 st year trail
were UMI-1810, IML-418-1, RCS-31(Mani-31-2-2), RCS-29 (Mizo-29-4-1), RCS-4 (Mani-4-
1-1) and RCS-21(Mizo-21(B)-2-3).
Root scanner images of roots of maize inbred lines under waterlogged and control conditions
Managing genetic resources for enhanced stress tolerance
414 | Page