Document Type : Research Paper
Authors
1
Student
2
Assistant Professor, Department of Agronomy and Plant Breeding, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardebil, Ardebil, Iran
3
Crop and Horticultural Science Research Department, Ardabil Agricultural and Natural Resources Research and Education Center, AREEO, Moghan, Iran
4
Department of Agronomy and plant breeding, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili.
5
2- Department of Horticulture, College of Agriculture, University of Al-Azhar (Branch Assiut), Assiut, 71524, Egypt.
10.22034/saps.2023.56134.3022
Abstract
Materials and Methods: An experiment was performed as split plots in a randomized complete block design with four replications during 2021 season at the Agricultural Research Station of Tabriz Branch, Islamic Azad University. The main plot was three irrigation regimes of well-watered, water-stressed, and interrupted irrigated conditions at the flowering and the seed filling stages, and sub plot was eight spraying treatments of double distilled water, 24-epibrassinolide (0.1 mg L−1), spermine (25 mg L−1), and silicon (7 mg L−1), 24-epibrassinolide (0.1 mg L−1) + spermine (25 mg L−1), 24-epibrassinolide (0.1 mg L−1) + silicon (7 mg L−1), spermine (25 mg L−1) + silicon (7 mg L−1), and 24-epibrassinolide (0.1 mg L−1) + spermine (25 mg L−1) + silicon (7 mg L−1).
Results: Water deficit stress was reduced grain yield and its components. The dual and triad applications of 24-epibrassinolide (0.1 mg L−1), spermine (25 mg L−1), and silicon (7 mg L−1) significantly increased the plant height, ear height, grain yield, and its components. Among grain yield with 100-grain weights, No. grain per/ear, ear height and ear diameter were positive correlation. Principal component analysis of agro-morphological traits under various water deficit stresses indicated that applications of 24-epibrassinolide (0.1 mg L−1) + silicon (7 mg L−1) had more impacts on grain yield, 100-grain weights, No. grain per/ear, ear height.
Conclusion: Overall, the dual and triad applications enhanced the plant's drought tolerance and improved plant height and grain yield of maize under water deficit stress.
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