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

Activity 6A.1.2: Developing QTL mapping populations for economic yield components of sweet sorghum
Milestone: Two F 5 sorghum RIL mapping populations (300 lines each) available for genotyping and multilocational
phenotyping for biomass yield, sugar content, and sugar extraction characteristics (CTH/BVSR) 2010
Contrasting parents, two sets each for biomass yield, sugar content, and sugar extraction characteristics have been
identified. They will be used in crossing program in 2007 to derive the mapping populations (RILs).
BVS Reddy
Milestone: SSR-anchored DArT marker linkage maps (>250 marker data points per RIL) available for the two
sorghum RIL populations (CTH/SPD) 2010
During the 2006 rainy season, plant x plant crosses were made, and F 1s and selfed parental plant seeds harvested.
Pairs of genetically diverse (dissimilarity greater than 0.70 based on allelic variation detected at 67 polymorphic
SSR loci distributed across 10 sorghum linkage groups), agronomically elite inbred parental lines differing in stem
sweetness, salinity tolerance in both pot and field screens), and other agronomic characteristics were selected for
making the crosses. Parental line pairs from which F 1 seed has been harvested included: BTx623 (salinity tolerant,
non-sweet) x ICSR 93024-1 (salinity sensitive, sweet), BTx623 x S 35 (salinity sensitive, sweet), ICSV 93046
(salinity tolerant, sweet) x ICSR 93024-1, ICSV 93046 x SPV 1022 (salinity sensitive, somewhat sweet), ICSV
93046 x S 35, and SP 39105 (salinity tolerant) x ICSR 93024-1. The F 1 seeds have been sown in the 2006/07 postrainy
season.
SP Deshpande and CT Hash
Activity 6A.1.3: Selecting for high grain yield and large grain sorghum lines with resistance to shoot fly and
adaptation to post-rainy season
Milestone: Sorghum lines (5) with large grain and high grain yield and less susceptible to shoot fly with postrainy
season adaptation developed (BVSR/HCS) 2008
During post-rainy season 2005-06, 13 lines adapted for post-rainy season (Moulee, M 35-1, IS 33844-5, M 35-1-19,
M 35-1 bulk 1, 2, 3, 4, SPV-1359, SPV 1411, SPV 1380, Giddi Maldandi, and NTJ-2) were crossed to obtain the
F 1 s. The F 1 s were grown in the 2006 rainy season and harvested separately. A total of 125 F 2 s were planted during
the post-rainy 2006 to undertake selections. The agronomically superior advanced breeding lines obtained will be
screened for shoot fly resistance. In another experiment, 18 F 2 s derived from crossing five dual season restorer lines
(M 35-1-19, ICSR 93001, 92003, 93031, and IS 33844-5) were sown during the post-rainy 2006 to undertake
selections. The advanced lines will be screened for SFR based on their agronomic performance.
BVS Reddy
Activity 6A.1.4: Selecting for high grain yield and grain mold tolerant sorghum lines
Milestone: Sorghum lines (5) with high grain yield and less susceptibility to grain mold developed for rainy season
adaptation (BVSR/RPT) 2009
A total of 120 F 5 progenies selected from the crosses of grain mold resistant landraces, high yielding B-lines, and
grain mold resistant breeding lines were evaluated in advanced screening trial for grain mold resistance (GMR)
during the 2006 rainy season. These progenies along with their test-crosses on known sources of A 1 and A 2
cytoplasmic male-sterile (CMS) systems-based male-sterile lines were also evaluated in a separate nursery in
breeding block during the 2006 rainy season. The results on screening trial are awaited. A total of 64 lines with
GMR (PGMR ≤ 5) and maintainer reaction were selected from the breeding block nursery. These included 60 white
grain lines and four red grain lines. The time to 50% the flowering in these 60 white grain lines ranged from 52 - 80
days and plant height ranged from 1.0 - to 2.0 m.
BVS Reddy and RP Thakur
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