Abstract
Fiften genotypes of maize ( Zea mays L.) were evaluated at two locations in Sudan (Khar toum and Wad Medani) during the season 2003/04, to estimate the genetic variability and performance for yield and some vegetative character s under drought at vegetative and reproductive growth stages. Three water treatments were applied, namely; well-watering, drought during vegetative stage only, and drought d uring reproductive stage only. Phenotypic and genotypic variances, genotypic coefficient of v ariation, heritability, genetic advance and phenotypic correlation between yield and some vegetative traits were estimated. Significant differences among genotypes were found for most of the traits studied, except days to 95% anthesis, stem diameter (45 days), leaf area index (30 and 60 days), and number of leaves/plant (45 days). The genotypes showed differ ential yield response to drought stress. High yield (kg/ha) was exhibited by genotype PR-2 when drought stress was during vegetative stage, and by genotype Z-2 when it was d uring reproductive stage. However, the genotype M-45 exhibited considerable high yield when it exposed to drought at both vegetative and reproductive stage. The effect of dr ought on genotypes was significant for days to 25% silking, plant height and grain yield ( kg/ha) at Wad Medani. High genotypic coefficient of variation, heritability and genetic advance were exhibited by plant height. Grain yield (kg/ha) was significantly and positively corr elated with plant height, stem diameter (45 days), leaf area index and number of leaves/plant ( 60 days), however, significant and negative association with days to 50% and 95% silking was observed. It could be concluded that, genotypes have differential yield response to droug ht and accordingly the genotype M-45 could be used for further improvement of drought to lerance in maize. Based on their positive association with yield, the characters plant height , stem diameter and number of leaves/plant would be the best selection criteria for maize impr ovement.
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Claims 11
Claim · model-written summary
Maize genotypes differed significantly for most traits, with stated exceptions.
- Outcome
- most of the traits studiede1
- Qualifier
- except days to 95% anthesis, stem diameter (45 days), leaf area index (30 and 60 days), and number of leaves/plant (45 days)e1
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fiften genotypes of maize ( Zea mays L.)”
e1“Significant differences among genotypes were found for most of the traits studied, except days to 95% anthesis, stem diameter (45 days), leaf area index (30 and 60 days), and number of leaves/plant (45 days)”
Claim · model-written summary
Maize genotypes differed in yield response to drought stress.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fiften genotypes of maize ( Zea mays L.)”
e1“The genotypes showed differ ential yield response to drought stress”
Claim · model-written summary
PR-2 had high yield under vegetative-stage drought.
- Material
- PR-2e1
- Treatment
- drought stress was during vegetative stagee1
- Outcome
- yield (kg/ha)e1
- Direction
- Highe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fiften genotypes of maize ( Zea mays L.)”
e1“High yield (kg/ha) was exhibited by genotype PR-2 when drought stress was during vegetative stage”
Claim · model-written summary
Z-2 had high yield under reproductive-stage drought.
- Material
- Z-2e1
- Organ / stage
- reproductive stagee1
- Treatment
- drought stresse2
- Outcome
- yield (kg/ha)e2
- Direction
- Highe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fiften genotypes of maize ( Zea mays L.)”
e1“by genotype Z-2 when it was d uring reproductive stage”
e2“High yield (kg/ha) was exhibited by genotype PR-2 when drought stress was during vegetative stage, and by genotype Z-2 when it was d uring reproductive stage”
Claim · model-written summary
M-45 had considerably high yield under drought at both stages.
- Material
- M-45e1
- Treatment
- drought at both vegetative and reproductive stagee1
- Outcome
- yielde1
- Direction
- highe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fiften genotypes of maize ( Zea mays L.)”
e1“the genotype M-45 exhibited considerable high yield when it exposed to drought at both vegetative and reproductive stage”
Claim · model-written summary
Drought significantly affected days to 25% silking, plant height and grain yield at Wad Medani.
- Treatment
- dr oughte1
- Outcome
- days to 25% silking, plant height and grain yield ( kg/ha)e1
- Setting
- Wad Medanie1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fiften genotypes of maize ( Zea mays L.)”
e1“The effect of dr ought on genotypes was significant for days to 25% silking, plant height and grain yield ( kg/ha) at Wad Medani”
Claim · model-written summary
Plant height had high genotypic coefficient of variation, heritability and genetic advance.
- Organ / stage
- plant heighte1
- Outcome
- genotypic coefficient of variation, heritability and genetic advancee1
- Direction
- Highe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fiften genotypes of maize ( Zea mays L.)”
e1“High genotypic coefficient of variation, heritability and genetic advance were exhibited by plant height”
Claim · model-written summary
Grain yield correlated significantly and positively with plant height, stem diameter, leaf area index and leaves per plant.
- Organ / stage
- plant height, stem diameter (45 days), leaf area index and number of leaves/plant ( 60 days)e1
- Outcome
- Grain yield (kg/ha)e1
- Direction
- positivelye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fiften genotypes of maize ( Zea mays L.)”
e1“Grain yield (kg/ha) was significantly and positively corr elated with plant height, stem diameter (45 days), leaf area index and number of leaves/plant ( 60 days)”
Claim · model-written summary
Grain yield was significantly negatively associated with days to 50% and 95% silking.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fiften genotypes of maize ( Zea mays L.)”
e1“significant and negative association with days to 50% and 95% silking was observed”
e2“Grain yield (kg/ha) was significantly and positively corr elated with plant height”
Claim · model-written summary
M-45 could be used to improve drought tolerance in maize.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“genotype M-45 could be used for further improvement of drought to lerance in maize”
Claim · model-written summary
Plant height, stem diameter and leaves per plant were recommended as selection criteria for maize improvement.
- Outcome
- best selection criteria for maize impr ovemente0
- Qualifier
- plant height , stem diameter and number of leaves/plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the characters plant height , stem diameter and number of leaves/plant would be the best selection criteria for maize impr ovement”