Abstract
Pearl millet ( Pennisetum glaucum (L.) R. Br.) is commonly grown at a wide range of plant population densities, both by design and as a consequence of stand establishment problems. High tillering genotypes are known to compensate effectively for lower plant population densities through their tillering capacity; less is known about the ability of naturally low tillering genotypes to adjust to low plant population densities. This is a particular concern in the case of the Iniadi landrace materials which are currently widely used in breeding programmes in both India and Africa. This research was done to determine how effectively the low tillering Iniadi types adjust to low plant population densities and how their mechanism(s) of adjustment compares to those of higher tillering materials. Two high and two low tillering genotypes were grown over a period of 5 years at plant population densities ranging from 12 to 2 plants/m 2 , under both high and low fertility regimes at the ICRISAT Centre, India. Both the high and low tillering types adjusted equally well to the reduced plant population densities, as judged by grain yield, but differed in their mechanism of adjustment. The high tillering genotypes adjusted, as expected, primarily by increasing productive tiller numbers, with only small changes in individual tiller productivity. The Iniadi genotypes increased productive tiller numbers in response to decreasing plant population densities to a limited degree, but increased panicle productivity to a much greater degree than the high tillering types. There was no differential effect on adjustment ability between the two types as a consequence of increased fertility, despite the stimulating effect of fertility on productive tiller numbers. The results are discussed in terms of generalized mechanisms of response to changing individual plant environmental resources (fertility and space), and in terms of the use of Iniadi germplasm in pearl millet breeding programmes.
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Claims 7
Claim · model-written summary
High and low tillering pearl millet types adjusted equally well in grain yield to reduced density.
- Taxon
- Pearl millet
Cenchrus americanust0 - Material
- high and low tillering typese0
- Treatment
- reduced plant population densitiese0
- Outcome
- grain yielde0
- Direction
- equally welle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both the high and low tillering types adjusted equally well to the reduced plant population densities, as judged by grain yield, but differed in their mechanism of adjustment.”
t0“Pearl millet”
Claim · model-written summary
High tillering genotypes adjusted primarily through increased productive tiller numbers.
- Taxon
- Pearl milletCenchrus americanust0
- Material
- high tillering genotypese0
- Outcome
- productive tiller numberse0
- Direction
- increasinge0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high tillering genotypes adjusted, as expected, primarily by increasing productive tiller numbers, with only small changes in individual tiller productivity.”
t0“Pearl millet”
Claim · model-written summary
Individual tiller productivity changed only slightly in high tillering genotypes.
- Taxon
- Pearl milletCenchrus americanust0
- Material
- high tillering genotypese0
- Outcome
- individual tiller productivitye0
- Direction
- small changese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high tillering genotypes adjusted, as expected, primarily by increasing productive tiller numbers, with only small changes in individual tiller productivity.”
t0“Pearl millet”
Claim · model-written summary
Iniadi genotypes increased productive tiller numbers only to a limited degree with decreasing density.
- Taxon
- Pearl milletCenchrus americanust0
- Material
- Iniadi genotypese0
- Treatment
- decreasing plant population densitiese0
- Outcome
- productive tiller numberse0
- Direction
- increasede0
- Qualifier
- to a limited degreee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Iniadi genotypes increased productive tiller numbers in response to decreasing plant population densities to a limited degree, but increased panicle productivity to a much greater degree than the high tillering types.”
t0“Pearl millet”
Claim · model-written summary
Iniadi genotypes increased panicle productivity more than high tillering types as density decreased.
- Taxon
- Pearl milletCenchrus americanust0
- Material
- Iniadi genotypese0
- Treatment
- decreasing plant population densitiese0
- Outcome
- panicle productivitye0
- Direction
- increasede0
- Comparator
- high tillering typese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Iniadi genotypes increased productive tiller numbers in response to decreasing plant population densities to a limited degree, but increased panicle productivity to a much greater degree than the high tillering types.”
t0“Pearl millet”
Claim · model-written summary
Increased fertility did not differentially affect adjustment ability between the types.
- Taxon
- Pearl milletCenchrus americanust0
- Treatment
- increased fertilitye0
- Outcome
- adjustment abilitye0
- Direction
- no differential effecte0
- Comparator
- two typese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no differential effect on adjustment ability between the two types as a consequence of increased fertility, despite the stimulating effect of fertility on productive tiller numbers.”
t0“Pearl millet”
Claim · model-written summary
Higher fertility stimulated productive tiller numbers.
- Taxon
- Pearl milletCenchrus americanust0
- Treatment
- increased fertilitye0
- Outcome
- productive tiller numberse0
- Direction
- stimulatinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no differential effect on adjustment ability between the two types as a consequence of increased fertility, despite the stimulating effect of fertility on productive tiller numbers.”
t0“Pearl millet”
The same questions in other papers
density · yield · Cenchrus americanus (pearl millet)Positive and negative results
31 papers in the same direction as this paper · 6 in the opposite direction
- negative
- no effect
- negative
34 papers more in this group
See all 38 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.