21. Search for new g loci unfruitful


Gurdev S. KHUSH and A. L. LIBROJO

International Rice Research Institiute, P.O. Box 933, Manila, Philippines


The recessive mutant g of rice, which conditions long empty glumes instead of rudimentary glumes of the grain, is a very useful marker of linkage group IV. Many rice varieties in our germplasm bank have long empty glumes. In search of new loci, conditioning long empty glumes, we studied the allelic relationships of the genes for long glumes in these varieties with the known g gene (RGS 10). A total of 49 varieties from 14 countries (Table 1) were crossed with IR36 had rudimentary glumes and with RGS 10. All the F\1\'s with IR36 had rudimentary glumes thus indicating that long empty glumes in all of these varieties are under recessive gene control. The F\1\'s of all of these varieties with RGS 10 had long empty glumes thereby showing that the recessive genes conditioning long empty glumes in all these varieties are allelic to g. Since these varieties come from many different countries, they are unrelated to each other. Thus the different mutational events must have occurred at the same locus as independent events. Our search for a new locus conditioning long empty glumes was unfruitful.



Table 1. Varieties from the IRRI germplasm bank with long empty glumes analyzed in this study


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Acc. No. Variety Name      Country of    
                           Origin        
==================================================
1349   P.I. 160764-2        China           
1358   P.I. 160769-1        China           
1454   P.I. 160863-1        China           
1535   Fei Oh Chan          China           
1537   Pien Chan Ying Tao   China        
1583   Chang Ch'sang                     
       Hsu Tao              China        
2809   Paiyautsuru 4        Taiwan       
4000   Gungen-lang-shui-pe  Philippines  
4212   Boenar               Indonesia    
5999   Pankhari 203         India        
6574   Pankiraj 258         Banglasesh   
8268   Pappaku              Taiwan       
8519   DZ 180               Bangladesh   
8739   UCP 38               Bangladesh   
11875  Kh. Nganh Tamay      Laos         
15165  C                    Ivory Coast  
15900  Ebagagona            Senegal      
17065  Napatsupai           Taiwan       
17909  Ketan Manggaran      Indonesia    
22422  ARC 12889            India        
23240  Slab                 Cambodia     
23267  Srau Slap            Cambodia     
23527  Khao Pick Deng       Laos         
24182  Ba Ponar             Vietnam      
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Acc. No.  Variety Name       Country of
                             Origin
==================================================
25218  Luttu                  Indonesia
25599  Pulut Kalesa           Indonesia
27038  Ase Pulu Haji          Indonesia
27050  Ase Pulut Cambang      Indonesia
28493  Tsao-fei-lai-feng      China
30593  Payon                  Sierra Leone
30733  Jebowalogi (A2-102)    Liberia
30740  Kartiwegee  (A2-76)    Liberia
30795  Maniqui (A2-95)        Liberia
30809  Netemah (A2-98)        Liberia
30864  Liberian Coll. D1-31   Liberia
31335  Liberian Coll. B-72    Liberia
31576  Fori Pakri             Bangladesh
33757  Taungpyanyin           Burma
33758  Taungpyanyin           Burma
35091  Pakhai Raj             India
38132  Pankhiraj 26-551       Bangladesh
41335  ARC 14035              India
42829  ARC 13994              India
43240  ARC 15858              India
46511  Pankhasail             India
46512  Pankheraj              India
47039  2-IS13-C77             Ivory Coast
50855  Kopike 1 (531)         Ivory Coast
53392  Fei-lai-feng           China
==================================================