Abstract
ABSTRACT Pearl millet (Pennisetum glaucum [L.] R. Br.) production in semi-arid regions is limited by poor seedling emergence that results in poor stand establishment and, low yield. Six pearl millet populations were created by divergent selection within the Tift #2 S-1 (TIFT2) pearl millet population for seedling root length in sand in the greenhouse or seedling root or coleoptile length in paper germination towels in the laboratory. The TIFT2 population (TIFT2) and the six selected populations were grown in the field in a randomized complete block design at Mississippi State, MS (MSU) and at Katumani and Kiboko, Kenya in 1991 and 1992. Populations were evaluated for seedling emergence and shoot height every 3 d for the first 15 d after planting. The greatest differences in emergence occurred at the most water-stressed locations in both years. The population selected for longer seedling root length in sand (LR-S) generally showed the highest field seedling emergence and shoot height during the first 9 d. Emergence of the LR-S population (18.8, 11.3, and 9.8 seedlings) at 15 d was significantly greater than TIFT2 (11.3, 5.7, and 4.3 seedlings) in the more moisture-stressed locations, Katumani and MSU in 1991 and Kiboko in 1992, respectively. Emergence of the LR-S population exceeded that of TIFT2 in every case except day 6 at MSU in 1992. The LR-S population also exhibited the fastest rates of emergence (1.1 to 2.1 seedlings d−1) at the most water-stressed locations. The LR-S population was able to tolerate or avoid moisture stress better than the other populations. There was little or no increase in seedling emergence or shoot height with selection for coleoptile length or seedling root length in paper germination towels. Selection for seedling root length in sand culture in the greenhouse demonstrated promise as an indirect selection criterion for increased seedling emergence and shoot height.
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Claims 9
Claim · model-written summary
Emergence differences among populations were greatest at the most water-stressed sites.
- Taxon
- Pearl millet
Cenchrus americanust0 - Outcome
- differences in emergencee0
- Direction
- greateste0
- Setting
- most water-stressed locationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The greatest differences in emergence occurred at the most water-stressed locations in both years.”
t0“Pearl millet”
Claim · model-written summary
The sand-selected long-root population generally had the highest field emergence and shoot height during the first nine days.
- Taxon
- Pearl milletCenchrus americanust0
- Material
- LR-Se0
- Outcome
- field seedling emergence and shoot heighte0
- Direction
- higheste0
- Qualifier
- during the first 9 de0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The population selected for longer seedling root length in sand (LR-S) generally showed the highest field seedling emergence and shoot height during the first 9 d.”
t0“Pearl millet”
Claim · model-written summary
At 15 days, LR-S emergence significantly exceeded TIFT2 at the more moisture-stressed locations.
- Taxon
- Pearl milletCenchrus americanust0
- Material
- LR-Se0
- Outcome
- Emergencee0
- Direction
- greatere0
- Value
- 18.8, 11.3, and 9.8 seedlingse0
- Comparator
- TIFT2e0
- Setting
- Katumani and MSU in 1991 and Kiboko in 1992e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Emergence of the LR-S population (18.8, 11.3, and 9.8 seedlings) at 15 d was significantly greater than TIFT2 (11.3, 5.7, and 4.3 seedlings) in the more moisture-stressed locations, Katumani and MSU in 1991 and Kiboko in 1992, respectively.”
t0“Pearl millet”
Claim · model-written summary
LR-S emergence exceeded TIFT2 except on day 6 at MSU in 1992.
- Taxon
- Pearl milletCenchrus americanust0
- Material
- LR-Se0
- Outcome
- Emergencee0
- Direction
- exceedede0
- Qualifier
- except day 6 at MSU in 1992e0
- Comparator
- TIFT2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Emergence of the LR-S population exceeded that of TIFT2 in every case except day 6 at MSU in 1992.”
t0“Pearl millet”
Claim · model-written summary
LR-S had the fastest emergence rates, 1.1 to 2.1 seedlings per day, at the most water-stressed sites.
- Taxon
- Pearl milletCenchrus americanust0
- Material
- LR-Se0
- Outcome
- rates of emergencee0
- Direction
- fasteste0
- Value
- 1.1 to 2.1 seedlings d−1e0
- Setting
- most water-stressed locationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The LR-S population also exhibited the fastest rates of emergence (1.1 to 2.1 seedlings d−1) at the most water-stressed locations.”
t0“Pearl millet”
Claim · model-written summary
LR-S tolerated or avoided moisture stress better than the other populations.
- Taxon
- Pearl milletCenchrus americanust0
- Material
- LR-Se0
- Outcome
- tolerate or avoid moisture stresse0
- Direction
- bettere0
- Comparator
- the other populationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The LR-S population was able to tolerate or avoid moisture stress better than the other populations.”
t0“Pearl millet”
Claim · model-written summary
Selecting coleoptile length gave little or no increase in emergence and shoot height.
- Taxon
- Pearl milletCenchrus americanust0
- Treatment
- selection for coleoptile lengthe0
- Outcome
- seedling emergence or shoot heighte0
- Direction
- little or no increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was little or no increase in seedling emergence or shoot height with selection for coleoptile length or seedling root length in paper germination towels.”
t0“Pearl millet”
Claim · model-written summary
Selecting root length in paper towels gave little or no increase in emergence and shoot height.
- Taxon
- Pearl milletCenchrus americanust0
- Treatment
- selection for coleoptile length or seedling root length in paper germination towelse0
- Outcome
- seedling emergence or shoot heighte0
- Direction
- little or no increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was little or no increase in seedling emergence or shoot height with selection for coleoptile length or seedling root length in paper germination towels.”
t0“Pearl millet”
Claim · model-written summary
Greenhouse sand-culture root-length selection showed promise as an indirect selection criterion for emergence and shoot height.
- Taxon
- Pearl milletCenchrus americanust0
- Outcome
- indirect selection criterion for increased seedling emergence and shoot heighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Selection for seedling root length in sand culture in the greenhouse demonstrated promise as an indirect selection criterion for increased seedling emergence and shoot height.”
t0“Pearl millet”
The same questions in other papers
processing · growth · Cenchrus americanus (pearl millet)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
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.