Using chemical male gametocides in hybrid rice breeding in China
1989
Tu, Zengping | Hu, Dawen (Guandong Academy of Agricultural Sciences, Guangzhou (China). Rice Research Inst.)
Research on chemically emasculated hybrid rice (CEHR) in Guangdong, China, started in 1970 with screening for effective chemical male gametocides. Some CEHR combinations developed in Guangdong and Jiangxi [China] consistently gave the highest yields for 4 yr in multilocation yield tests and high yielding fields. Seed production of CEHR also increased, from 0.4 t/ha with 40-60% seed purity to 1.5 t/ha with 80%-90% seed purity. The advantages of CEHR are: 1) it does not need a special sterile line, greatly increasing the range of combinations with desirable parents; 2) it gives a stable distant hybridization F1 combination with stronger hybrid vigor, faster and easier; 3) it can interact with conventional breeding using outstanding conventional rice varieties as parents; and 4) with some combinations, the F2 can be used in rice production. The difficulties in utilizing CEHR are: 1) the level of CEHR seed production is lower than with MS lines; 2) it is still impossible to produce CEHR seed on a large scale; and 3) the current sprayers, male gametocides, and CEHR seed production organization need improvement.
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by University Library, University of the Philippines at Los Baños
