Title of article
Agronomic and Photosynthetic Characteristics of Different Maize Hybrids in Response to Water Deficit Stress at Different Phenological Stages
Author/Authors
Goodarzian-Ghahfarokhi, Maryam Department of Agronomy and Plant Breeding - Campus of Agriculture and Natural Resources - Razi University, Kermanshah, Iran , Mansouri-Far, Cyrus Department of Agronomy and Plant Breeding - Campus of Agriculture and Natural Resources - Razi University, Kermanshah, Iran , Saeidi, Mohsen Department of Agronomy and Plant Breeding - Campus of Agriculture and Natural Resources - Razi University, Kermanshah, Iran , Abdoli, Majid Young Researchers and Elite Club - Zanjan Branch, Islamic Azad University, Zanjan, Iran , Esmaeilpour-Jahromi, Mohammad Faculty of Agricultural Science - Jahrom University, Jahrom, Iran
Pages
12
From page
23
To page
34
Abstract
The aim of present study was to evaluate the effects of drought stress on net photosynthesis rate (Pn), stomatal resistance, water use efficiency (WUE) and biomass (BM) of six maize (Zea mays L.) hybrids. Drought stress applied by withholding water supply at 4-5 leaf stage (S1, vegetative stage), anthesis (S2, reproductive stage), and dual stress condition (S3, combination of vegetative and reproductive stages). Results showed that all of the traits changed differently among hybrids under water stress but recovered close to initial values after re-watering. S3 affected leaf gas exchange and agronomic traits more severely than S1 and S2 treatments. Pn decreased due to imposed drought but more slowly in hybrids SC647 and SC704. In addition, SC700, SC704 and SC647 had the maximum BM and plant height. But, WUE decreased during the water stress period especially in hybrids SC260 and SC370 in which the decrease was remarkable. It can be concluded that SC704 and SC647 were the most tolerant and SC260 and SC370 were the least tolerant hybrids to water stress. The variation observed amongst the evaluated hybrids suggests the existence of valuable genetic resources for crop improvement in relation to drought tolerance.
Keywords
Dry weight , Drought , Gas exchange , Re-watering , Water use efficiency
Journal title
Astroparticle Physics
Serial Year
2016
Record number
2450903
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