El-Shamarka, S., Darwish, I., Marwa, M., Gamea, H., El-Harany, A. (2019). Improving Drought Tolerance in White Maize Population. Alexandria Journal of Agricultural Sciences, 64(5), 341-351. doi: 10.21608/alexja.2019.80490
S.A. El-Shamarka; I.H. Darwish; M.El-Nahas Marwa; H.A. Gamea; A.A. El-Harany. "Improving Drought Tolerance in White Maize Population". Alexandria Journal of Agricultural Sciences, 64, 5, 2019, 341-351. doi: 10.21608/alexja.2019.80490
El-Shamarka, S., Darwish, I., Marwa, M., Gamea, H., El-Harany, A. (2019). 'Improving Drought Tolerance in White Maize Population', Alexandria Journal of Agricultural Sciences, 64(5), pp. 341-351. doi: 10.21608/alexja.2019.80490
El-Shamarka, S., Darwish, I., Marwa, M., Gamea, H., El-Harany, A. Improving Drought Tolerance in White Maize Population. Alexandria Journal of Agricultural Sciences, 2019; 64(5): 341-351. doi: 10.21608/alexja.2019.80490
Improving Drought Tolerance in White Maize Population
1Crop Science Dept., Faculty of Agriculture, Menoufia Univ., Egypt
2Maize Research Section, Field Crops Research Institute, ARC, Egypt
Receive Date: 05 April 2020,
Accept Date: 05 April 2020
Abstract
Field experiments were carried out in four successive seasons (2015 to 2018) at the experimental farm of faculty of agriculture, Menoufia University, in Shebin El-Kom, Egypt. The main objectives of this study were to study the effect of water stress on different maize traits and identify the effectiveness of S1 recurrent selection for improving drought tolerance in Tep#5 population (white). 100 S1’s were isolated and evaluated under normal irrigation (NI) and drought stress (DS) at flowering stage. The highest yielding 10 lines (10%) selected under each environment were random mated by bulking pollen and make crosses handly. Two sub-populations were obtained (Tep#5-NI and Tep#5-DS).The population (Tep#5-NI) along with the original population (Tep#5) were evaluated for 19 traits under normal irrigation condition (NI) and the population (Tep#5-DS) along with the original population (Tep#5) were evaluated under drought stress condition (DS) in a randomized complete block design with four replications. Results indicated wide genetic variation among S1 progenies for most studied traits under both selection environments (NI and DS). Heritability estimates were generally higher under drought stress than under normal irrigation conditions. Number of kernels/row, 100-kernels weight and ear length traits were predicted to grain yield more efficiently under drought stress than under normal irrigation conditions. One cycle of S1 recurrent selection under water-stress caused a significant actual improvement of grain yield of the newly developed population (Tep#5-DS) over its original population (Tep#5) of 15.47%. The improved population Tep#5-NI developed by using normal irrigation as a selection environment showed significant actual improvements in grain yield under normal irrigation (12.46%) environment. Selection under water stressed and non-stressed irrigations were efficient in improving grain yield.
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