Abstract
Abstract Sorghum ( Sorghum bicolor [L.] Moench) is the fifth most important cereal crop worldwide and second after maize ( Zea mays L.) in Kenya. It is an important food security crop in arid and semi‐arid lands, where its production potential is hampered by drought. Drought tolerance can be measured by a plant's ability to resist premature senescence, often described as stay‐green. This study was carried out with the objective of identifying novel stay‐green trait among wild and landrace genotypes of sorghum. Forty‐four sorghum genotypes that included 16 improved, nine landraces, and 17 wild relatives of sorghum alongside known stay‐green sources, B35 and E36‐1, were evaluated under well‐watered and water‐stressed conditions in an alpha‐lattice design of three replications. Data was collected on plant height (PHT), flag leaf area (FLA), panicle weight (PWT), 100‐seed weight (HSW), relative chlorophyll content (RCC), number of green leaves at maturity (GLAM), days to 50% flowering (DFL), and grain yield (YLD). Genetic diversity was determined using diversity arrays technology (DArT) sequencing and quality control (QC) markers were generated using a java script. Lodoka, a landrace, was the most drought‐tolerant genotype, recorded the highest numbers of RCC and GLAM, and outperformed B35 and E36‐1 in yield under water‐stress and well‐watered conditions. The RCC was highly correlated with GLAM ( r = .71) and with yield‐related traits, HSW ( r = .85), PWT ( r = .82), and YLD ( r = .78). All traits revealed high heritability (broad‐sense) ranging from 60.14 to 98.4% for RCC and DFL, respectively. These results confirm earlier reports that wild relatives and landraces are a good source of drought tolerance alleles.
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Claims 10
Claim · model-written summary
The Lodoka landrace was the most drought-tolerant genotype.
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lodoka, a landrace, was the most drought‐tolerant genotype”
t0“sorghum”
Claim · model-written summary
Lodoka had the highest relative chlorophyll content and green leaf number at maturity.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lodoka, a landrace, was the most drought‐tolerant genotype, recorded the highest numbers of RCC and GLAM”
e1“relative chlorophyll content (RCC), number of green leaves at maturity (GLAM)”
t0“sorghum”
Claim · model-written summary
Lodoka yielded more than B35 and E36-1 under both water regimes.
- Material
- Lodokae1
- Outcome
- yielde0
- Direction
- outperformede0
- Qualifier
- water‐stress and well‐watered conditionse0
- Comparator
- B35 and E36‐1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“outperformed B35 and E36‐1 in yield under water‐stress and well‐watered conditions”
e1“Lodoka, a landrace”
t0“sorghum”
Claim · model-written summary
Relative chlorophyll content correlated with green leaves at maturity at r=.71.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The RCC was highly correlated with GLAM ( r = .71)”
t0“sorghum”
Claim · model-written summary
Relative chlorophyll content correlated with hundred-seed weight at r=.85.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HSW ( r = .85)”
e1“The RCC was highly correlated with GLAM ( r = .71) and with yield‐related traits, HSW”
t0“sorghum”
Claim · model-written summary
Relative chlorophyll content correlated with panicle weight at r=.82.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PWT ( r = .82)”
e1“The RCC was highly correlated with GLAM ( r = .71) and with yield‐related traits, HSW”
t0“sorghum”
Claim · model-written summary
Relative chlorophyll content correlated with grain yield at r=.78.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“YLD ( r = .78)”
e1“The RCC was highly correlated with GLAM ( r = .71) and with yield‐related traits, HSW”
t0“sorghum”
Claim · model-written summary
Broad-sense heritability for RCC was 60.14%.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All traits revealed high heritability (broad‐sense) ranging from 60.14 to 98.4% for RCC and DFL, respectively”
t0“sorghum”
Claim · model-written summary
Broad-sense heritability for DFL was 98.4%.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All traits revealed high heritability (broad‐sense) ranging from 60.14 to 98.4% for RCC and DFL, respectively”
t0“sorghum”
Claim · model-written summary
The results identified wild relatives and landraces as sources of drought tolerance alleles.
- Outcome
- source of drought tolerance allelese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wild relatives and landraces are a good source of drought tolerance alleles”
t0“sorghum”