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

Reproductive stage observations were recorded from
the fixed lines and promising selections viz.,CR2993,
CR2882-1, CR2908, CR2875, CR2899, CR2881, CR2882-
1-1, CR2907, CR2881-1, CR2902, CR2903, CR2890,
CR2877, CR2902-1, CR2875-1, CR2902-1 were identified
from cross CR143-2-2/Swarna, Salumpikit/Dandi,
Dandi/APO, Salumpikit/APO, Salumpikit/Naveen for
yield and yield traits and were retested against blast
for its resistance.
Breeding for submergence prone and medium
deep waterlogged areas
Development of breeding material suitable for submergence
prone situation
One hundred and eighty single plant progenies from
19 cross combinations developed for submergence tolerance
were evaluated under controlled submergence
conditions during the wet season, 2011 and 64 lines
showed more than 60% survival. Out of these lines, 114
single plant selections were made at the time of flowering
and maturity on the basis of submergence tolerance,
plant and panicle characters.
Development of breeding material suitable for medium
deep waterlogged conditions
One thouse five hundred and twenty-two (F 3
-F 8
)
single plant progenies along with 22 F 2
bulks were
grown under medium deep waterlogged situation. Out
of this material, 1000 single plants and 76 uniform progenies
were selected on the basis of tolerance to water
logging, plant and panicle characters (Table 8).
Evaluation of elite breeding lines in Advance Yield Trial
(Station trial)
Twenty promising genotypes along with five check
varieties (Purnendu, Sabita, Jal-lahari, Sarala and
Table 8. Breeding materials evaluated and selections
made during wet season 2011
No. of
crosses/
bulks/ No. of selections
progenies Single Uniform
Generation grown plants bulks
F 2
bulks 22 138 -
F 3
462(74)* 375 -
F 4
385(47) 416 -
F 5
128(11) 71 -
F 6-
F 8
547(79) - 76
Total 1522 (233) 1000 76
*Number in parentheses indicates no. of crossses
Varshadhan) were grown in a replicated trial under
semi-deep water logged situation during wet season,
2011. Among the 25 entries tested only one culture
CR2416-27-2-1-2-2-1 gave better yield (4.08 t ha -1 ) than
the best check variety Varshadhan (3.86 t ha -1 ) followed
by CR2415-43-1-1-1-1-1 (3.51 t ha -1 ) and CR2416-15-2-
2-7-1 (3.31 t ha -1 ). Most of the entries flowered between
last week of October and second week of November.
AICRIP trials and performance of entries
nominated during 2011
Three AICRIP trials viz., NSDWSN (48 entries including
three checks), IVT-SDW (18 entries including
three checks), AVT 1-SDW (seven entries including three
checks) were conducted under semi-deep water conditions
during wet season 2011.
All the seven entries viz., CR2416-13-1-1-1, CR2439-
B-12-1-1, CR2416-6-1-1-1, CR2436-B-8-1-1, CR2378-13-
1-1-1, CR2377-21-5-1-1 and CR2389-11-2-1-1 nominated
to NSDWSN under AICRIP trials have been found
promising and promoted to IVT-SDW. Two entries
CR2389-5-2-1-1 and CR2378-13-4-1-1 tested under IVT-
SDW have been promoted to AVT1-SDW testing during
wet season, 2012.
Development of suitable varieties for delayed
monsoon/early flooding situation
Seventeen advanced cultures were evaluated in replicated
transplanted condition in 2011 wet season for
yield and yield attributing characters with three check
varieties Pooja, Gayatri and Varshadhan with both
normal and aged seedlings. Sowing for aged seedlings
trial was done on 8 th June and transplanted on 26 th
August 2011 using more than 70 days old seedlings.
CR2750-154 (4.10 t ha -1 ) could give better yield than the
best check Gayatri (3.81 t ha -1 ) followed by CR2753-264
(3.90 t ha -1 ) and CR2304-5-7 (3.80 t ha -1 ). Sowing for
delayed seeding was done on 20 th July and transplanting
was done with 35 days old seedlings. The genotype
CR2565-674-292 (4.0 t ha -1 ) was observed to be the highest
grain yielder closely followed by CR2750-382 (3.80
t ha -1 ) and CR2304-5-7 (3.70 t ha -1 ) superior to the check
varieties Varshadhan (3.40 t ha -1 ) and Gayatri (3.30 t
ha -1 ). After twelve days of transplanting both the trials
came under complete submergence for five days.
In general, planting with aged seedlings delayed
the flowering by more than forty days resulting into
reduced grain yield. CR2750-154, CR2753-264, CR2304-
5-7, CR2565-674-292 and Gayatri were found suitable
with aged seedling whereas, CR2565-674-292, CR2304-
26 CRRI ANNUAL REPORT 2011-12