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Genetic analysis of adaptation differences between highland and lowland tropical maize using molecular markers

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Relation http://oar.icrisat.org/5747/
http://dx.doi.org/10.1007/s001220051315
 
Title Genetic analysis of adaptation differences between highland and lowland tropical maize using molecular markers
 
Creator Jiang, C
Edmeades, G O
Armstead, I
Lafitte, H R
Hayward, M D
Hoisington, D A
 
Subject Genetics and Genomics
Maize
 
Description Molecular-marker loci were used to investigate
the adaptation differences between highland and
lowland tropical maize. An F2 population from the cross
of two inbred lines independently derived from highland
and lowland maize germplasm was developed, and extracted
F3:4 lines were phenotype in replicated field trials
at four thermally diverse tropical testing sites, ranging
from lowland to extreme highland (mean growing season
temperature range 13.2–24.6°C). Traits closely related
with adaptation, such as biomass and grain yield, yield
components, days from sowing to male and female flowering,
total leaf number, plant height and number of primary
tassel branches (TBN), were analyzed. A large line
´ environment interaction was observed for most traits.
The genetic basis of this interaction was reflected by significant,
but systematic, changes from lowland to highland
sites in the correlation between the trait value and
genomic composition (designated by the proportion of
marker alleles with the same origin). Joint analysis of
quantitative trait loci (QTLs) over sites detected 5–8
QTLs for each trait (except disease scores, with data only
from one site). With the exception of one QTL for
TBN, none of these accounted for more than 15% of the
total phenotypic variation. In total, detected QTLs accounted
for 24–61% of the variation at each site on average.
For yield, yield components and disease scores, alleles
generally favored the site of origin. Highland-derived
alleles had little effect at lowland sites, while lowland-
derived alleles showed relatively broader adaptation.
Gradual changes in the estimated QTL effects with
increasing mean site temperature were observed, and
paralleled the observed patterns of adaptation in high land and lowland germplasm. Several clusters of QTLs
for different traits reflected the relative importance in the
adaptation differences between the two germplasm types,
and pleiotropy is suggested as the main cause for the
clustering. Breeding for broad thermal adaptation should
be possible by pooling genes showing adaptation to specific
thermal regimes, though perhaps at the expense of
reduced progress for adaptation to a specific site. Molecular
marker-assisted selection would be an ideal tool for
this task, since it could greatly reduce the linkage drag
caused by the unintentional transfer of undesirable traits
 
Publisher Springer Verlag
 
Date 1990
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/5747/1/TheorApplGenet_99_1106%E2%80%931119_1999.pdf
Jiang, C and Edmeades, G O and Armstead, I and Lafitte, H R and Hayward, M D and Hoisington, D A (1990) Genetic analysis of adaptation differences between highland and lowland tropical maize using molecular markers. TAG Theoretical and Applied Genetics, 99 (7-8). pp. 1106-1119. ISSN 1432-2242