TY  - JOUR
AV  - public
A1  - Ochieng, G
A1  - Ngugi, K
A1  - Wamalwa, L K
A1  - Manyasa, E
A1  - Muchira, N
A1  - Nyamongo, D
A1  - Odeny, D A
TI  - Novel sources of drought tolerance from landraces and wild sorghum relatives
UR  - https://doi.org/10.1002/csc2.20300
JF  - Crop Science (TSI)
SN  - 0011-183X
PB  - Crop Science Society of America
N1  - This work was undertaken as part of the initiative ?Adapting
Agriculture to Climate Change: Collecting, Protecting
and Preparing Crop Wild Relatives,? which is supported
by the Government of Norway. The project is managed
by the Crop Trust with the Millennium Seed Bank of the
Royal Botanic Gardens, Kew, and implemented in partnership
with national and international gene banks and plant
breeding institutes around the world. For further information,
see the projectwebsite: http://www.cwrdiversity.org/.
The research was partly funded by the Kenya?s National
Research Fund (NRF) (https://researchfund.go.ke/) and
the CGIAR Research Program (CRP) on Grain Legumes
and Dryland Cereals. The authors are grateful to the International
Crops Research Institute for Semi-Arid Tropics
(ICRISAT) and the University of Nairobi for facilitation,
technical support and knowledge sharing.
N2  - Sorghum (Sorghum bicolor [L.] Moench) is the fifth most important cereal crop
worldwide and second aftermaize (Zeamays 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.
KW  - Sorghum
KW  -  Cereal
KW  -  Drought Tolerance
Y1  - 2020/11//
SP  - 104
ID  - icrisat11762
EP  - 118
VL  - 61
IS  - 1
ER  -