Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Effects of drought stress on grain yield, agronomic performance, and heterosis of marker-based improved provitamin-A maize synthetics and their hybrids
Provitamin A-enriched maize (Zea mays L.) is an important complementary food staple for combating vitamin A deficiency (VAD) in high maize-producing and maize-consuming countries of sub- Saharan Africa (SSA). However, frequent drought is a major abiotic factor that retards maize growth, resulting in...
Saved in:
| Format: | Article |
|---|---|
| Published: |
2021
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
MARC
| LEADER | 00000njm a2000000a 4500 | ||
|---|---|---|---|
| 001 | oai:repository.ui.edu.ng:123456789/12169 | ||
| 042 | |a dc | ||
| 720 | |a Iseghohi, I. |e author | ||
| 720 | |a Abe, A. |e author | ||
| 720 | |a Meseka, S. |e author | ||
| 720 | |a Mengesha, W. |e author | ||
| 720 | |a Gedil, M. |e author | ||
| 720 | |a Menkir, A. |e author | ||
| 260 | |c 2021 | ||
| 520 | |a Provitamin A-enriched maize (Zea mays L.) is an important complementary food staple for combating vitamin A deficiency (VAD) in high maize-producing and maize-consuming countries of sub- Saharan Africa (SSA). However, frequent drought is a major abiotic factor that retards maize growth, resulting in yearly fluctuations in grain yield. Development of provitamin A-enriched maize varieties resilient to recurrent drought stress could enhance and stabilize maize grain yield. This study was conducted to assess the effects of managed drought stress (MDS) on the performance and heterosis of some marker-based improved provitamin A maize synthetics and their varietal-cross hybrids. The maize synthetics and their varietal-cross hybrids, along with a drought-tolerant check (PVASYN13), were evaluated under MDS and well-watered (WW) conditions at Ikenne, Nigeria, for two years. Genotype and year effects were significant for grain yield and some agronomic traits under MDS and WW conditions. Grain yield was reduced by 56% under MDS. Grain yield was significantly correlated with days to anthesis, days to silking and anthesis-silking-interval under MDS but not under WW condition. Under MDS, three varietal-cross hybrids (PVASYNHGBC0/PVASYNHGAC0, PVASYNHGBC2/ PVASYNHGAC0, PVASYNHGBC0/ PVASYNHGAC1) had similar grain yields and tolerance indices as the drought-tolerant check, whereas PVASYNHGBC1/PVASYNHGAC2 produced 12.5% more grain yield than the check. Three of the varietal-cross hybrids (PVASYNHGBC0/PVASYNHGAC0, PVASYNHGBC0/PVASYNHGAC1 and PVASYNHGBC1/PVASYNHGAC2) had significant mid-parent heterosis for grain yield under the two test conditions, and were recommended for developing drought-tolerant varieties to com-bat VAD in drought-prone environments of SSA | ||
| 024 | 8 | |a 1542-7536 | |
| 024 | 8 | |a ui_art_iseghohi_effects_2021 | |
| 024 | 8 | |a Jour1542-7536nal of Crop Improvement 36 (2), pp. 239–259 | |
| 024 | 8 | |a https://repository.ui.edu.ng/handle/123456789/12169 | |
| 653 | |a Grain yield | ||
| 653 | |a Heterosis | ||
| 653 | |a Maize synthetics | ||
| 653 | |a Managed drought stress | ||
| 653 | |a Varietal-cross hybrids | ||
| 245 | 0 | 0 | |a Effects of drought stress on grain yield, agronomic performance, and heterosis of marker-based improved provitamin-A maize synthetics and their hybrids |