Flowering Synchronization in Hybrid Rice Parental Lines at Different Sowing Dates

Mahmoud Gaballah, Hassan Hamad, Atif Bamagoos, Hesham Alharby, Sharif Ahmed, Ismail A. Ismail, Md Sohidul Islam and Ayman EL Sabagh
Additional contact information
Mahmoud Gaballah: Agricultural Research Center, Field Crops Research Institute, Rice Research and Training Center, Kafr El–sheikh 33511, Egypt
Hassan Hamad: Agricultural Research Center, Field Crops Research Institute, Rice Research and Training Center, Kafr El–sheikh 33511, Egypt
Atif Bamagoos: Department of Biological Sciences, Faculty of Science, King Abdulaziz University, Jeddah 21577, Saudi Arabia
Hesham Alharby: Department of Biological Sciences, Faculty of Science, King Abdulaziz University, Jeddah 21577, Saudi Arabia
Sharif Ahmed: International Rice Research Institute, Bangladesh Office, Dhaka 1213, Bangladesh
Ismail A. Ismail: Department of Biology, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
Md Sohidul Islam: Department of Agronomy, Hajee Mohammad Danesh Science and Technology University, Dinajpur 5200 Bangladesh
Ayman EL Sabagh: Department of Agronomy, Kafrelsheikh University, Kafrelsheikh 33511, Egypt

Sustainability, 2021, vol. 13, issue 6, 1-17

Abstract: Hybrid seed set on the female line depends primarily on its flowering synchronization with the restorer line (R), therefore, the sowing of male and female lines must be planned properly to achieve this. Field experiments on different sowing dates (May 1st, May 15th, and May 30th) of R lines (Giza 178R, Giza 179R, and Giza 181R) and cytoplasmic male sterile (CMS) lines (IR69625A, IR70368A, IR58025A, K17A, and G46A) were carried out at the farm of Sakha Agricultural Research Station, Kafr El-Sheikh, Egypt during 2019 and 2020 to study the effect of sowing dates on flowering synchronization in hybrid rice. The results indicated that the synchronization of flowering between CMS lines and R lines has highly significant effects on the days to 50% heading, number of leaves, effective accumulated temperature (EAT), plant height, panicle exertion percentage, panicle length, number of fertile panicles, panicle weight, seed set percentage, harvest index and seed yield of hybrid rice. The highest seed yield (1.72 and 1.41 t ha −1 , respectively in 2019 and 2020) was recorded from the sowing date May 1st and the hybrid combination of Giza 178R × IR58025A (2.06 and 2.12 t ha −1 in 2019 and 2020, respectively). The grain yield had a significant and highly significant positive correlation with the plant height (cm), panicle exertion percentage, panicle length, number of panicles plant −1 , panicle weight, seed set percentage, and harvest index. In Egypt, May 1st is the best time for the synchronization of hybrid rice lines and a combination of Giza 178R × IR58025A may be recommended for better performance.

Keywords: hybrid rice; sowing date; CMS lines; restorer lines; grain yield (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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