Record Details

Phenotypic assessment of genetic gain from selection for improved drought tolerance in semi-tropical maize populations

CGSpace

View Archive Info
 
 
Field Value
 
Title Phenotypic assessment of genetic gain from selection for improved drought tolerance in semi-tropical maize populations
 
Creator Musimwa, Tatenda R.
Molnar, Terence Luke
Dutta, Somak
Dhliwayo, Thanda
Trachsel, Samuel
Lee, Michael
 
Subject drought tolerance
water
maize
climate change
genetic gain
 
Description Most maize production across the globe is rain-fed, and production is set to be negatively impacted as duration and occurrence of droughts increases due to climate change. Development of water-deficit tolerant maize germplasm has been a major focus for most breeding programmes. Here, we sought to assess the genetic gain for grain yield in two maize populations developed for drought tolerance at CIMMYT by evaluating their cycle progeny through hybrid performance. Inbreds derived from different cycles of the Drought Tolerant Population (DTP) and La Posta Sequia (LPS) were mated to a tester (CML550), and resulting hybrids were evaluated under managed water-deficit stress and well-watered conditions. The difference in yield between water-deficit and well-watered treatments was 27% and 36% for the DTP and LPS, respectively. Genetic gain for grain yield across cycles for the two populations was confirmed in the study. Genetic gain was observed for both treatments indicating that selection for water-deficit stress tolerance simultaneously improves grain yield in well-watered conditions. The DTP population had a genetic gain of 0.07 t ha−1 cycle−1, while the LPS had 0.16 t ha−1 cycle−1 under water-deficit conditions. Significant genetic gain was also observed in the well-watered treatments for both populations. Anthesis to silking interval was significantly reduced under water-deficit stress conditions in both populations. Plant and ear height were reduced in the LPS population in both treatments, while no reductions were observed for the trait in the DTP population. Potential water-deficit stress tolerance donor lines with yields comparable to commercial check varieties were identified.
 
Date 2023-02
2023-01-04T08:00:35Z
2023-01-04T08:00:35Z
 
Type Journal Article
 
Identifier Musimwa, T.R., Molnar, T.L., Dutta, S., Dhliwayo, T., Trachsel, S. and Lee, M. 2022. Phenotypic as-sessment of genetic gain from selection for improved drought tolerance in semi‐tropical maize populations. Journal of Agronomy and Crop Science 12592. https://hdl.handle.net/10883/22070
1439-037X
https://hdl.handle.net/10568/126526
https://hdl.handle.net/10883/22070
https://doi.org/10.1111/jac.12592
 
Language en
 
Rights CC-BY-4.0
Open Access
 
Format application/pdf
 
Publisher Wiley
 
Source Journal of Agronomy and Crop Science