Central Rice Research Institute Annual report...2011-12

1(1.80 t ha -1 ), CRR676-11 (1.77 t ha -1 ) and CRR507-12-
B-1 (1.71 t ha -1 ) but statistically at par with the best
check Vandana (1.58 t ha -1 ) (Table 3).
Hybridization, selection and evaluation of
breeding materials
Fifteen new crosses were made to improve drought
tolerance, blast resistance, early vigour and grain quality
in upland varieties for varietal development in
rainfed uplands. During 2011 wet season, in the pedigree
nursery for unfavourable uplands, 2394 progenies
were grown and 860 single plants and 20 uniform bulk
selections were made from 109 crosses (Table 4). In F 3
generation 531 single plant progenies were selected from
16 crosses. Based on plant type, panicle characters, reaction
to abiotic and biotic stresses, in F 4
, F 5
, F 6
, F 7
and
F 8
generations 113, 73, 15, 100 and 28 single plants
were selected from 15, 11, 7, 28 and 32 crosses, respectively.
Besides, 20 uniform bulks were multiplied to
obtain seed for preliminary yield testing.
Table 3. Performance of the entries under preliminary
yield trial- unfavourable upland
Days to Plant Grain
Entries 50% height yield
flowering (cm) (t ha -1 )
CRR676-1 69 94.3 1.80
CRR676-11 69 96.4 1.77
CRR507-12-B-1 72 93.0 1.71
CRR417-B-68-B-1-1-2-B-B 68 89.0 1.63
CRR418-B-6-B-1-1-2-1-B 69 88.4 1.48
CRR451-11-B-1 76 89.1 1.46
Vandana 67 87.9 1.58
Anjali 70 76.6 1.56
Brown gora 65 91.0 1.45
Mean 74 87.5 1.07
CD (P=0.05) 2 8.6 0.38
Table 4. Selections from segregating populations under
unfavourable uplands at Hazaribag 2011wet season
Progenies SP Bulk
Generation Cross grown selected selected
F 3
16 1946 531
F 4
15 137 113
F 5
11 111 73
F 6
7 46 15
F 7
28 92 100
F 8
32 62 28 20
Total 109 2394 860 20
At Cuttack, seven new crosses were made in 2011
wet season using Mahulata, DPS 3 and Naliakhura as
parents to improve drought tolerance, weed competitiveness
and earliness with blast resistance. Backcross
population of a cross between Lalat/O.nivara
(AC100374)//Lalat were evaluated for blast resistance
and two lines were found resistant. A total of 102 breeding
lines from ten crosses (F 2
to F 7
) including 30 fixed
lines were evaluated along with check varieties Lalat
and Khandagiri. Six genotypes significantly outyielded
the checks and were identified as promising
lines.
Development of Aerobic Rice for
Favourable Soil Condition
Development of rice lines for water limiting
environment
Eleven lines from CR143-2-2/Naveen and twelve
fixed lines from Salumpikit/Naveen in F 7
generation
have been selected for further advancement. Similarly,
in F 8
generation, 12 lines from APO/PS (1086), four lines
from Salumpikit/Lalat; 10 lines from CR143-2-2/
Swarna; 43 lines from IR 20/Dandi; six lines from
CR143-2-2/APO; five lines from CR143-2-2/IR20; eight
lines from Dandi/APO; seven lines from Naveen/
CR143-2-2; six lines from Salumpikit/Naveen; five from
lines Salumpikit/APO; two lines from Naveen/
Vandana and 15 lines from Naveen/APO were found
promising and selected for further testing. In F 9
generation,
five lines from APO/PS (1086), nine lines from
Naveen/Salumpikit and 18 lines from IR20/APO were
found promising.
New Nominations for AICRIP Trial 2012
Six promising lines viz., CR2902-22-2-4, CR2890-3-
2, CR2993-5-1 and CR3425-11-2 with flowering duration
ranging from 94-98 days were nominated for IVT-
IME and another two entries, CR3420-4-1and CR2902-
22-2-1 were nominated to IVT-IM under AICRIP for
evaluation.
Development of breeding materials for rainfed
semi-aerobic/favourable uplands
AICRIP trials
In case of favourable uplands coordinated trials
were conducted in two duration groups i,e. early and
mid-early. In AVT2-E none of the entries were better
than the national check Sahbhagidhan (2.65 t ha -1 ) in
the trial. Among the test entries, TJP 48 (2.48 t ha -1 ) was
the highest yielder which also performed very well at
22 CRRI ANNUAL REPORT 2011-12