Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges &
Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
119.59 gm/plant. Harvest index ranged from 15.14 (ICP 10477) to 24.81 (ICP 9750) with an
average of 19%.
Based on days to 50% flowering, the genotypes were grouped into different maturity groups.
Extra short maturing genotypes (51-70 days) were absent in the mini-core collection. Thirteen
genotypes were grouped into the category of short duration (71-100 days), 12 in short medium
duration (101-110 days), 79 in medium duration (111-140 days), 18 in medium-long duration
(141-160 days) and five in long duration (>160 days). Upadhyaya et al., 2006 evaluated core
and mini-core collection of pigeon pea for traits associated with drought tolerance under
terminal drought stress conditions and earliness was used as characters for screening for
drought tolerance.
The promising accessions were identified for different characters. The accessions ICP10654,
ICP4903, ICP7869, ICP12596, ICP10559, ICP9414, ICP9691, ICP8757, ICP1273 and
ICP8602 recorded plant height of more than 153 cm. The highest number of primary branches
per plant (>25) was observed in the accessions ICP10559, ICP12596, ICP7076, ICP12298,
ICP9336, ICP9750, ICP4392, ICP4167and ICP6859. The accessions ICP7, ICP14444,
ICP3049, ICP15493, ICP12142, ICP9691, ICP7223, ICP5863, ICP995, ICP6128 and ICP 939
recorded more than 140 pods per plant. Higher pod weight (>55g/plant) was observed in
accessions ICP10503, ICP7057, ICP6971, ICP6929, ICP12142, ICP7, ICP6992, ICP6370,
ICP6049, ICP8152 and ICP 5863. High-yielding accessions (>35g/plant) were ICP7057,
ICP12142, ICP7, ICP10503, ICP4307, ICP6929, ICP3049, ICP6971, ICP5142 and ICP6992.
The accessions ICP5142, ICP11477, ICP6815, ICP5863, ICP13577, ICP6971, ICP6370,
ICP10559, ICP11823, ICP12596 and ICP 7 recorded total biomass of more than 200g/plant.
Higher harvest index (>20%) was recorded in accessions ICP9750, ICP9691, ICP9336,
ICP10228, ICP8949, ICP12298, ICP13633, ICP14147, ICP12680, ICP12410 and ICP 8949.
Choudhary et al., 2011 concluded that agronomic traits such as pods/plant and seed yield/plant
under actual water deficit condition should be given much importance while breeding for
drought resistance in pigeon pea.
Physiological characterization of mini-core collection revealed that SCMR ranged from 43.27
(ICP 6370) to 68.07 (ICP 4029) with an average value of 51.23. The canopy temperature ranged
from 31.13 (ICP 11477) to 39.73 (ICP 8266) with a mean of 34.21 0 C. The net photosynthetic
rate ranged from 2.39 (ICP 10710 to 18.97 (ICP 15185) with a mean of 8.15 µmolCO2/m 2 /sec.
The stomatal conductance ranged from 0.01 (ICP 7221) to 0.12 (ICP 6929) with an average of
0.05 mmol H2O/m 2 /sec. The transpiration rate ranged from 0.37 (ICP 7221) to 3.30 (ICP
13577) with an average of 1.56 cm/sec. Leaf temperature ranged from 30.82 (ICP 7) to 32.90
(ICP 1156) with a mean of 31.96 0 C.
The genotypes ICP4029, ICP11543, ICP6123, ICP11627, ICP14701, ICP14444, ICP12142,
ICP15109, ICP6992 and ICP3451 recorded SPAD values more than 55. Low canopy
Managing genetic resources for enhanced stress tolerance
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