Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges &
Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
Kapoor, D., Bhardwaj, S., Landi, M., Sharma, A., Ramakrishnan, M. and Sharma, A. 2020.
The impact of drought in plant metabolism: How to exploit tolerance mechanisms to
increase crop production. Appl. Sci., 10(16): 5692.
T3-02O-1393
Mapping QTLs for Various Yield Component and Stress Indices in
Recombinant Inbred Lines Populations of Wheat (Triticum aestivum L.)
Godawari Pawar 1* , Vishwanathan Chinnusamy 2 , Monika Dalal 3 , S. Sudhir Kumar 2 ,
Harikrishna and Biswabiplab Singh 2
1 VNMKV, Parbhani (MS), 2 ICAR-NIPB, New Delhi and 3 ICAR-IARI, New Delhi
*gsp.mau@rediffmail.com
An experimental set up comprising of 278 RILs and 2 parental lines was conducted at the
Division of Plant Physiology, Indian Agricultural Research Institute (IARI), New Delhi.
Calculation of indices mainly focus on selecting genotypes that have high yield firstly under
yield potential conditions (non-stress) and secondly under stress conditions. Multiple stress
indices were calculated on the basis of grain yield, thousand grain weight, grain weight per ear,
grain number per ear and harvest index. The correlation among multiple stress indices were
seen and presented. Pattern of selection value of TOL, SSI and RCI as minimum and STI, MPI,
YSI, HM, GMP and PCI as maximum were considered as indicator for selection of RILs. On
this basis of TOL, SSI, RCI and YSI some RILs and on the basis of STI, MPI, HM, GMP and
PCI we selected some RILs. These RILs are superior under stress condition. In Field trials
calculated stress intensity is 0.38. The larger the value of SI, the more severe is the stress
intensity. Grain yield under normal sowing is positively correlated with all indices except STI
(-0.01) and YSI (-0.43). Grain yield under heat stress is showing strong positive association
with HM (0.94) also with GMP (0.88), MP (0.78) negative with TOL (-0.51) and SSI (-
0.74).This results concluded that population with higher HM are superior under stress
conditions and negative association of yield under stress with TOL and SSI, it indicates yield
loss under stress conditions. Stress indices MP (0.83, 0.78) and GMP (0.70, 0.88) are suitable
to screen tolerance because positive association with grain yield of both treatments. From
correlation of different indices, some indices are showing strong association among them so all
indices were selected for further discussion except TOL and MP. Traits related to yield Viz.,
thousand kernel weight, grains/ear, grains weight/ear and harvest index were also used to
calculate indices and their correlation were used for further discussion.
Inclusive composite interval mapping (ICIM) analysis discovered the total of 55 putative QTLs
controlling yield related traits and their stress indices based on heat and control conditions on
field. These QTLs were found distributed across the chromosomes with LOD values varied
from 2.509 to 5.485. Among multiple stress indices 9 QTLs controlling the harmonic mean and
337 | Page Managing genetic resources for enhanced stress tolerance