Water Use Efficiency of Common Sorghum and Grain Corn Cultivars and Comparing the Effect of Water Deficit on These Cultivars
Subject Areas : Research On Crop Ecophysiology
NASRIN SAFIAN
1
(PhD Student, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran.)
MOHAMMADREZA NADERIDARBAGHSHAHI
2
(Associate Professor in Agronomy, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran.)
HAMID REZA SALEMI
3
(Assistant Professor, Isfahan Agriculture and Natural Resources Research Center, Isfahan, Iran.)
MASSOUD TORABI
4
(Assistant Professor, Isfahan Agriculture and Natural Resources Research Center, Isfahan, Iran.)
ALI SOLEIMANI
5
(Professor in Agronomy, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran.)
Keywords: Drought stress, Grain yield, harvest index, Keywords: Grain fat, Grain lignin,
Abstract :
Water Use Efficiency of Common Sorghum and Grain Corn Cultivars and Comparing the Effect of Water Deficit on These Cultivars Nasrin Safian1, Mohammadreza Naderidarbaghshahi2*, Hamid Reza Salemi3, Massoud Torabi4, Ali Soleimani5 1- PhD Student, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran. 2- Associate Professor in Agronomy, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran. 3- Assistant Professor, Isfahan Agriculture and Natural Resources Research Center, Isfahan, Iran. 4- Assistant Professor, Isfahan Agriculture and Natural Resources Research Center, Isfahan, Iran. 5- Professor in Agronomy, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran. * Corresponding Author E-mail: mnaderi@khuisf.ac.ir Received: 20 October 2022 Accepted: 8 January 2023 Abstract Drought stress is the most important abiotic factor which limits the growth and production of plants in arid and semi-arid regions. In order to investigate the effects of irrigation regimes (100, 80 and 60% of the plant's water requirement based on the Penman-Monteith method) on grain yield of sorghum (Payam and Kimia) and corn (704 and Maxima) cultivars under the hot and dry climate of Isfahan, a split plots experiment was carried out in the years 2018-2019 in randomized complete blocks design with three replications. Results showed that the highest index of chlorophyll and grain fat was obtained from cultivar 704 and in 100% of irrigation. Cultivar 704 produced the highest grain lignin under 60% and 80% irrigation regimes. Kimia cultivar produced more lignin compared to Payam cultivar. Payam cultivar produced the most yield and the highest plants under irrigation regimes of 100 and 80. Compared to Payam cultivar, Kimia showed more 1000 grains weight under different irrigation regimes. The harvest indices of Kimia and Payam cultivars showed significant decreases by increasing the drought. Different cultivars have different mechanisms to tolerate drought stress. As a drought tolerant plant, Sorghum was less damaged by stress than corn. Biochemical traits of plants can be used as stress resistance indicators in breeding programs and the selection of resistant cultivars.