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Heterosis in landrace-based topcross hybrids of pearl millet across arid environments

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Title Heterosis in landrace-based topcross hybrids of pearl millet across arid environments
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Creator O. P. Yadav
E. Weltzien-Rattunde
F. R. Bidinger
V. Mahalakshmi
 
Subject genetic variance
heterosis
landrace
Pennisetum glaucum
stress environments
topcross hybrids
 
Description Not Available
This study quantified the magnitude of heterosis in pearl millet (Pennisetum glaucum) topcross hybrids produced
by crossing 16 diverse landraces and three high yielding open-pollinating varieties on two homozygous malesterile
lines. Hybrids and pollinators were grown in 12 year location combinations in India that were grouped
into three zones. Genetic components of variance quantifying the differences among these hybrids were estimated.
The hybrids showed a conspicuous heterosis for grain yield, earliness and biomass yield but not for straw yield.
The level and direction of heterosis for time to flowering depended strongly on the earliness of the male-sterile
line. In the terminal drought stress zone hybrids made on the early maturing male-sterile line 843A had the highest
level of heterosis for grain yield (88%). This was partly due to escape from terminal stress. In the other two
zones the heterosis for grain yield was on average 30%. Heterosis for biomass yield and biomass yield per day
was on average also positive in all three zones. For all traits, except time to flowering and biomass yield per day,
pollinator effects were the only significant source of variation. Differences between hybrids were mostly caused
by additive genetic effects. Significant amount of heterosis observed in landrace-based topcross hybrids for grain
yield and other productivity-related traits suggested that substantial improvement in pearl millet productivity in
and environments can be obtained by topcrossing locally adapted landraces on suitable male-sterile lines.
Not Available
 
Date 2019-06-18T11:59:40Z
2019-06-18T11:59:40Z
2000-01-01
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/20596
 
Language English
 
Relation Not Available;
 
Publisher Not Available