Indian Society of Genetics & Plant Breeding

Identification of genotypes and marker validation for grain filling rate and grain filling duration in wheat under conservation agriculture

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Increase in ambient temperature beyond threshold level as
predicted by global climate models may impact wheat
production severely in India if it happens during grain filling
stage. Grain filling rate (GFR) and grain filling duration
(GFD) are critical determinant for final grain yield realization
in wheat. GFR in wheat follow a slow-fast-slow pattern,
however, wheat genotypes may have quantitative
differences in this pattern. Ninty six diverse wheat
genotypes were evaluated for GFR in two phases i.e.
during first 20 days after anthesis and thereafter up to
physiological maturity and grain filling duration. Out of 96
genotypes, six namely, G958, G1203, G1219, G1275, HD2985
and HDCSW18 were having high GFR during initial phase
while seven genotypes viz., G949, G1081, G1124, G1159,
G1204, HD3059 and HD2380 exhibited high GFR at terminal
phase of grain development. Genotypes, G1263, G1207,
G1423 along with some of the released varieties, HD2285,
WH1105 and HD2864 were having higher GFD. Correlation
between the two traits were not significant (r = -0.17959).
ANOVA for GFR and GFD indicated highly significant
variability among the genotypes. QTLs identified for GFR
and GFD elsewhere were validated in Indian breeding
material under conservation agriculture. Two SSR markers
viz., XCfd42 and Xwmc500 explained about 6% and 1%
variation for GFR, respectively. Similarly, already reported
marker Xwmc382 was able to explain about 8% of variation
for GFD in the Indian breeding material. It has been
postulated from the study that by crossing the genotypes
with high GFR in different grain growth stages like HD
CSW 18 and HD 3059, genotypes with consistently high
grain filling rate throughout the grain growth stage can be
developed. The markers XCfd42 and Xwmc 382 can be
further explored for fine mapping to integrate in the
breeding programme for selection.

Keywords: Grain filling duration, grain filling rate, wheat, SSR marker


Year: 2018
Volume: 78
Issue: 3
Article DOI: 10.31742/IJGPB.78.3.1
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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