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Grain yield components of pearl millet under optimum conditions can be used to identify germplasm with adaptation to arid zones

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Title Grain yield components of pearl millet under optimum conditions can be used to identify germplasm with adaptation to arid zones
Not Available
 
Creator E.J. van Oosterom
E. Weltzien
O.P. Yadav
F.R. Bidinger
 
Subject GE interaction
Grain number
Individual grain mass
Landrace
Panicle size
Tillering
 
Description Not Available
There is evidence that high-tillering, small-panicled pearl millet landraces are better adapted to the severe, unpredictable drought stress of
the arid zones ofNWIndia than are low-tillering, large-panicled modern varieties, which significantly outyield the landraces under favourable
conditions. In this paper, we analyse the relationship of arid zone adaptation with the expression, under optimum conditions, of yield
components that determine either the potential sink size or the ability to realise this potential. The objective is to test whether selection under
optimal conditions for yield components can identify germplasm with adaptation to arid zones in NW India, as this could potentially improve
the efficiency of pearl millet improvement programs targeting arid zones. We use data from an evaluation of over 100 landraces from NW
India, conducted for two seasons under both severely drought-stressed and favourable conditions in northwest and south India. Trial average
grain yields ranged from 14 g m 2 to 182 g m 2. The landraces were grouped into clusters, based on their phenology and yield components as
measured under well-watered conditions in south India. In environments without pre-flowering drought stress, tillering type had no effect on
potential sink size, but low-tillering, large-panicled landraces yielded significantly more grain, as they were better able to realise their
potential sink size. By contrast, in two low-yielding arid zone environments which experienced pre-anthesis drought stress, low-tillering,
large-panicled landraces yielded significantly less grain than high-tillering ones with comparable phenology, because of both a reduced
potential sink size and a reduced ability to realise this potential. The results indicate that the high grain yield of low-tillering, large-panicled
landraces under favourable conditions is due to improved partitioning, rather than resource capture. However, under severe stress with
restricted assimilate supply, high-tillering, small-panicled landraces are better able to produce a reproductive sink than are large-panicled
ones. Selection under optimum conditions for yield components representing a resource allocation pattern favouring high yield under severe
drought stress, combined with a capability to increase grain yield if assimilates are available, was more effective than direct selection for grain
yield in identifying germplasm adapted to arid zones. Incorporating such selection in early generations of variety testing could reduce the
reliance on random stress environments. This should improve the efficiency of millet breeding programs targeting arid zones.
Not Available
 
Date 2019-06-18T11:51:42Z
2019-06-18T11:51:42Z
2006-01-01
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/20591
 
Language English
 
Relation Not Available;
 
Publisher Elsevier