Current linkage maps ............... 17

Research Notes

1. Botanical indices of ploidy levels in some African accessions of Oryza punctata, by C. C. Nwokeocha and J. O. Faluyi ............... 65
2. An enzymatic observation of Yuan-Jiang wild rice in Yunnan, China, by P. R. Yuan, K. S. Cheng, Y. X. Lu, H. W. Cai and X. K. Wang ............... 65
3. On the origin of Asian cultivated rice, by Kan-Sheng Cheng ............... 66
4. Rice types at a vestige site of Caoxie Hill in different ancient periods, by Ling-Hua Tang, Dai-Hang Zhuo, Jiang-Si Zuo and Hiroshi Fujiwara ............... 67
5. Is the common wild rice differentiated into Keng Types in China? by Hong-Wei Cai and Xiang-Kun Wang ............... 68
6. Distribution of bacterial blight resistance genes in wild-rice populations of Thailand, by H. Morishima and T. Miyabayashi ............... 70
7. American long-grain rice varieties belong to subspecies japonica, by Y. I. Sato and I. Nakamura ............... 72
8. Classification of Myanmar rice germplasm based on isozyme polymorphism, by A. M. Shatta, B. G. delos Reyes, D. S. Brar and G. S. Khush ............... 73
9. Classification of rice germplasm from Iran through isozyme analysis, by G. A. Nematzadeh and G. S. Khush ............... 74

10. Brittle node, a new marker for chromosome 2, by G. S. Khush and Alma Sanchez ............... 75
11. A gamete eliminator reconfirmed in a Japonica-Indica hybrid, by Yoshio Sano ............... 76
12. A new dominant dwarfing gene in rice, by Hee-Jong Koh and Mun-Hue Heu ............... 77
13. A new gene for resistance to gallmidge in rice variety Abhaya, by M. N. Srivastava, Arvind Kumar, S. K. Shrivastava and R. K. Sahu ............... 79
14. A desynaptic gene ds3(t) located on chromosome 7 in rice, by H. Yasui, S. Saiki and N. Iwata ............... 80
15. A gene accelerating the heading of late lines with ef-1 alleles, by Kuo-Hai Tsai ............... 83
16. A new allele of Enp-1 in rice germplasm of Vietnam, by Luu-Ngoc Trinh, B. G. delos Reyes, D. S. Brar and G. S. Khush ............... 85
17. Linkage between z-9 and Pgi-I markers of chromosome 3 in rice, by B. G. delos Reyes, D. S. Brar and G. S. Khush ............... 86
18. Integration of conventinal and RFLP linkage maps in rice, II. Chromosomes 6, 9, 10 and 11, by O. Ideta, A. Yoshimura, T. Matsumoto, H. Tsunematsu, H. Satoh and N. Iwata............... 87
19. Construction of an RFLP/RAPD linkage map by using recombinant inbred lines, by H. Tsunematsu, H. Hasegawa, S. Yoshimura, A. Yoshimura and N. Iwata ............... 89

20. Preliminary characterization of fertility-restoring mutants induced from cytoplasmic male-sterile rice, by Yu-Wei Shen, Qi-Hua Cai and Ming-Wei Gao ............... 90
21. Inheritance of a thermosensitive genic male-sterile mutant of Indica rice, by Reena Borkakati and S. S. Virmani ............... 92
22. An RFLP-based genetic analysis of photoperiod sensitive male sterility in rice, by Qi-Fa Zang, B.Z. Shen, S.K. Dai, M.H. Mei, M.A. Saghai Maroof and Z. B. Li ............... 94
23. A new thermosensitive radiation-induced male-sterile rice line, by Yu-Wei Shen, Qi-Hua Cai and Ming-Wei Gao............... 97

24. Genetic analysis of "cybrids" produced by asymmetric fusion between O. rufipogon (cytoplasm donor) and O. sativa (Kitaake, nuclear parent), by Toshiro Kinoshita, Kohichi Mori and Itsuro Takamure ............... 99
25. Genetic analysis of some traits of paddy and upland rices using doubled haploids derived from the F₁ plants of Koshihikari x Sensho, by Ikuo Ando, Taiji Yoshida and Naoki Kishimoto ............... 102
26. Use of somaclonal variation to improve aluminium tolerance of rice, and mineral characterization of the tolerance, by Van Sint Jan V. and J. Bouharmont ............... 105
27. A dominant gene controlling accumulation of glucomannan in the cell wall of rice endosperm, by M. Yano, R. Zamorski, A. Saito and N. Shibuya ............... 107
28. Genetics of hull-imposed dormancy in rice seeds, by V. V. Shenoy ............... 108
29. Analysis of seed and maternal genetic effects on milling quality in Indica hybrids, by Chun-Hai Shi and Jun Zhu............... 110
30. Inheritance of mutant characters induced by gamma-ray irradiation of anther cultures in rice, by Itsuro Takamure, Kohichi Mori and Toshiro Kinoshita ............... 111
31. Plant regenatation from protoplasts of cold tolerant rice varieties, by J. N. Gupta, A. Pattanayak and H. S. Gupta ............... 113

V. Molecular genetics

32. Estimation of nuclear DNA content in Oryza by flow cytometry, by Cesar P. Martinez, K. Arumuganathan, H. Kikuchi and E. D. Earle ............... 116
33. Selection of bacterial blight resistant rice plants in the F₂ generation via their linkage to molecular markers, by M. L. P. Abenes, E. R. Angeles, G. S. Khush and N. Huang............... 120
34. Localization of a repetitive sequence, (CCCTAAA)₁₁, at the ends of rice chromosomes, by Mei-Chu Chung, Chii-Nien Ning, Tiyun Wu, Ray Wu and Hsin-Kan Wu ............... 123
35. Isolation and characterization of a telomere-like sequence in rice, by Tiyun Wu, Sandra Zhang, Jinhua Xiao, Hsin-Kan Wu and Ray Wu ............... 125
36. Comparison between PCR-based RFLP and Southern-based RFLP as DNA markers for germplasm classification in rice, by Behzad Ghareyasie, Ning Huang, Gerard Second, John Bennett and Gurdev S. Khush ............... 129
37. Construction of a molecular map of rice and gene mapping using a double haploid population of a cross between Indica and Japonica varieties, by Li-Huang Zhu, Ying Chen, Yun-Bin Xu, Ji-Chen Xu, Hong-Wei Cai and Zhong-Zhuan Ling ............... 132
38. Mapping quantitative trait loci via restriction fragment length polymorphism markers in rice, by Yun-Bi Xu, Zong-Tan Shen, Ji-Chen Xu, Ying Chen and Li-Huang Zhu ............... 135