| dc.contributor.author | Adeyeye, B.R. |
| dc.date.accessioned | 2024-04-29T14:58:48Z |
| dc.date.available | 2024-04-29T14:58:48Z |
| dc.date.issued | 2023-08 |
| dc.identifier.citation | Adeyeye, B.R. (2023). Genetic analysis of early maturing provitamin A maize (Zea mays L.) inbred lines under Striga infestation, combined drought and heat stress (doctoral thesis). Federal University of Technology Minna, Minna, Nigeria, (154 p.). |
| dc.identifier.uri | https://hdl.handle.net/20.500.12478/8473 |
| dc.description.abstract | High yielding and stable early maturing provitamin A (PVA) maize hybrids with
combined stresses (drought and heat and Striga) tolerance are needed to combat
malnutrition, low yield and insecurity in sub-Sahara Africa (SSA). To address this
need, PVA, PVA-QPM (quality protein maize) inbred lines with Striga and drought
tolerant genetic make-up were developed through the massive effort of the
International Institute of Tropical Agriculture Maize Improvement Program (IITAMIP)
for its hybrid development and commercialization. This study was designed to
(i) to develop early maturing PVA single cross hybrids that are tolerant to multiple
stresses (combined drought and heat stress and Striga infestation), (ii) classify the set
of inbred lines into heterotic groups, (iii) assess the levels of resistance/tolerance of
inbred lines to Striga infestation and combined drought and heat stress tolerance in
selected early maturing PVA inbred lines, (iv) identify inbred and hybrid testers, and
(v) Determine the performance and yield stability of hybrids across contrasting
environments. A panel of two-hundred and ten single-cross hybrids were generated
from 50 selected early maturing PVA inbred lines using the Line x tester mating
design crossed to four commercial PVA early maturing inbred testers plus six single
crosses derived from intermating the four testers, plus four commercial checks. 250
PVA, PVA-QPM early maturing maize inbred lines plus six commercial inbred
checks were evaluated under Striga infestation, combined drought and heat stress
and optimal environments in Nigeria from 2019 to 2021 growing seasons. Days to
50 % anthesis and silking, plant and ear heights, plant and ear aspects
complemented grain yield of the inbred lines. These inbred lines are used in their
hybrid combination to produce outstanding PVA hybrids. General combining
ability (GCA) and specific combining ability (SCA) mean squares were significant
for grain yield and other traits indicating that additive and non-additive gene effects
were important in the control of the inheritance of grain yield and other traits across
the contrasting environments. Using the base indices as criteria for selection, 93
Striga resistant, 82 combined drought and heat tolerant and 36 inbred lines that
combined resistance/tolerance to both stresses were identified. TZEIOR 172 x
TZEIOR 108 and TZEIOR 202 x TZEI 25 has been identified as highest yielding
and most stable hybrids across the three contrasting environments. TZEIOR 21 x
TZEI 25 was identified as the preferred hybrid for Striga infested environments.
TZEIOR 202 x TZEIOR 164 was identified as the preferred hybrid under combined
drought and heat stress. The inbred line such as TZEIOR 201 and TZEIOR 202
recorded significantly positive GCA effects for grain yield across the contrasting
environments could be useful for developing Striga tolerant and/or combined
drought and heat tolerant hybrids and synthetic. |
| dc.description.sponsorship | Bill & Melinda Gates Foundation |
| dc.format.extent | 154 p. |
| dc.language.iso | en |
| dc.publisher | Federal University of Technology Minna |
| dc.subject | Maize |
| dc.subject | Drought Tolerance |
| dc.subject | Hybrids |
| dc.subject | Striga Hermonthica |
| dc.title | Genetic analysis of early maturing provitamin A maize (Zea mays L.) inbred lines under Striga infestation, combined drought and heat stress |
| dc.type | Thesis |
| cg.contributor.crp | Maize |
| cg.contributor.affiliation | Federal University of Technology Minna |
| cg.coverage.region | Africa |
| cg.coverage.region | West Africa |
| cg.coverage.country | Nigeria |
| cg.coverage.hub | Headquarters and Western Africa Hub |
| cg.researchtheme | Biotech and Plant Breeding |
| cg.identifier.bibtexciteid | ADEYEYE:2023 |
| cg.authorship.types | CGIAR and developing country institute |
| cg.iitasubject | Agronomy |
| cg.iitasubject | Food Security |
| cg.iitasubject | Maize |
| cg.iitasubject | Plant Breeding |
| cg.iitasubject | Plant Production |
| cg.notes | IITA supervisor: Dr. Badu-Apraku, B. |
| cg.publicationplace | Minna, Nigeria |
| cg.accessibilitystatus | Limited Access |
| cg.reviewstatus | Internal Review |
| cg.usagerightslicense | Copyrighted; all rights reserved |
| cg.targetaudience | Scientists |
| cg.futureupdate.required | No |
| cg.contributor.acknowledgements | I thank the Almighty God for His divine enablement and grace to start and finish
this programme.
I sincerely appreciate my University major supervisor, Professor A. S. Gana for
been a true father and his co-supervisor Dr. K. D. Tolorunse, I appreciate you for
your understanding, guidance, and patience especially during my travelling times.
Also, my research supervisor Dr. B. Badu-Apraku for the quality training I received
while under his supervision during my field experiment at the International Institute
of Tropical Agriculture (IITA). The assistance of Dr. L.Y. Bello, Head of
Department, and the entire staff of the Crop Production Department FUT, Minna
cannot go unacknowledged. I cannot forget to thank the staff of the Maize
Improvement Program, IITA Ibadan for their support.
I am most grateful to my husband, Mr. Philip Adeyeye, who endured loneliness,
during my research work at Ibadan, Mokwa and Kadawa which allowed me to
complete my programme in a reasonable time. He took great care of our twins alone
at a point coupled with his jobs and never stopped praying and cheering me up. My
parents, Pastor and Mrs. G. A. Aleji is worthy of my appreciation and heartfelt
gratitude. So many times, I would drop off the children with them with no notice
and they consistently supported me spiritually, financially, physically and
emotionally which got me towards the successful completion of my degree and to
my siblings, for their prayers and love. I say thank you.
To my dependable friends, Mrs. Bisola Adekunle-Jegede and husband, Mrs. Sarah
Chiejile and Engr. Jonathan and Ruth Jiya and their entire families, I am
thankful for always welcoming me to your house and fed me well at Ibadan and
Minna respectively. I am grateful to my colleagues, friends and everyone who
contributed to the successful completion of this programme; names too numerous to
mention. Finally, to Bill and Melinda Gate foundation who provided sponsorship
throughout the period of my research. |
