ICRISAT Archival Report 2006 - The seedlings of success in the ...

Milestone 5A.2.1.2: At least six promising maintainers of A 4 cytoplasm improved for agronomic traits (seed and pod
size and disease resistance) through backcrossing (KBS/KML, 2009)
In any dynamic hybrid breeding program the genetic enhancement of female parents for desired agronomic traits is
essential to develop promising hybrid combinations. To increase the pod size of promising A-lines, ICPA 2039 and
ICPA 2089 were crossed with a white seeded variety ‘Kanchan’. Similarly, crosses are being initiated to incorporate
sterility mosaic and wilt resistance in ICPA 2044 and ICPA 2045.
KB Saxena and K Madhavi Latha
Output target 5A.3: Pigeonpea hybrid parents (25−30 A-lines and 50−55 R-lines) characterized for important
agronomic traits and molecular diversity (2009)
Activity 5A.3.1:Assessing the agronomic and molecular diversity of pigeonpea hybrid parental lines
Milestone 5A.3.1.1: A/B- and R- lines characterized for important agronomic traits (KBS/KML/HCS/SP, 2008)
During the 2006 rainy season, 26 maintainer lines and 22 restorer lines were evaluated in separate replicated trials at
Patancheru. The data are being compiled on a number of qualitative and quantitative traits. We propose to repeat
this trial in 2007 rainy season also. This information will be shared with the germplasm unit and also will be used
for registration and selection of hybrid parents in the future.
KB Saxena, K Madhavi Latha, HC Sharma and S Pande
Relative susceptibility of maintainer and restorer lines to Helicoverpa armiger: Fifteen restorers and 13
maintainer lines along with resistant (ICPL 187-1, ICPL 332) and susceptible (ICPL 87 and ICPL 87119) checks
were evaluated for resistance to the pod borer, H. armigera. There were three replications in a randomized complete
block design for each set. Data were recorded on pod damage and overall resistance scores at maturity. The overall
resistance scores ranged from 4.5 to 9.0. The maintainer lines ICPB 2032, ICPB 2049, ICPB 2050, and ICPB 2051
showed a damage rating of 5.5 to 6.0 compared to 8.2 in ICPL 87 and 4.5 in ICPL 332. Percentage pod damage
ranged from 75.7 to 86.4%. Most of the lines (except ICPB 2032, ICPB 2043, ICPB 2046, ICPB 2046, and ICPB
2048) were highly susceptible to wilt (over 80% mortality).
Among the restorer lines, the genotypes ICPR 2913, ICPR 2920, ICPR 2922 showed a damage rating of 4.7 to 6.0
compared to 4.5 in ICPL 332 and 8.2 in ICPL 87. Pod damage was 56.6 to 70.0% in ICPR 2336 and ICPR 2904
compared to 64.8% in ICPL 332 and 86.0% in ICPL 87. The lines ICPR 2904, ICPR 2905, and ICPL 187-1 showed
high susceptibility to wilt (>80% plant mortality) compared to 7.8% in improved version of ICPL 332 and 8.5% in
ICPL 87.
HC Sharma and KB Saxena
Milestone 5A.3.1.2: Available male sterile (A/B) and fertility restorer (R) lines characterized using molecular
markers (RKV/KML/KBS/DAH, 2009)
Output Target 5A.4: Seed production technology for pigeonpea hybrids and their parents improved (2009)
Activity 5A.4.1: Developing an efficient seed production technology for pigeonpea hybrids and their parents.
Milestone 5A.4.1.1: Improved seed production technology for pigeonpea hybrids and their parents developed
(KBS/KML, 2009)
Hybrid pigeonpea technology is new and the efficiency of commercial hybrid production depends on the improved
seed production technology. To reduce the cost of seed production of A-lines, an experiment was carried out by
sowing ICPA 2048 at three spacings (75 × 30, 75 × 100, 75 × 150 cm). The results are awaited.
KB Saxena and K Madhavi Latha
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