B. Report of the Committee on Gene symbolization, Nomenclature and Linkage Groups

T. KINOSHITA, Convener

I. Registration of new gene symbols

In accordance with rule 7, the following gene symbols were registered after an examination for priority and validity, with the assistance of coordinators for respective traits.

GENE SYMBOL REGISTRATION No. 41

Registrants: Yang Ren-Cui, K. J. Liang, N. Y. Wang, W. M. Li and S. H. Chen (Crop Genetics and Breeding Institute, Fujian Agricultural College, Fuzhou, 350002, China)

Gene symbol: tms-1

Gene name: thermosensitive genic male sterility-1

Character expression: Male sterile, as a recessive character, under temperatures higher than 26.5 deg C in the meiosis stage, but male-fertile under lower temperatures (23-25 deg C)

Name of original line: 5460s, early-maturing, radiation induced mutant of IR54.

Remark: Effects of temperature and daylength were examined and F2 segregation data are reported.

References: Sun, Z. X., S. K. Min and Z. M. Xiong 1989. RGN 6: 116-117. Yang, R. C., W. M. Li, N. Y. Wang, K. J. Liang and Q. H. Chen 1989. Chinese J. Rice Sci. 3(1): 47-48.

GENE SYMBOL REGISTRATION No. 42

Registrant: Kiyoaki Maruyama, Hiroshi Kato and Hitoshi Araki (National Agricultuaral Research Center, Tsukuba, Japan)

Gene symbol: tms-2

Gene name: thermosensitive genic male sterility-2 Character expression: Male sterile under higher temperatures Name of original line: A mutant line induced by gamma ray irradiation from Reimei

Remark: Data on temperature reaction and F2 segregations are reported.

References: Maruyama, K., H. Araki and H. Kato 1991. Rice Genetics II. 1991. IRRI, Philippines, pp. 227-232.

GENE SYMBOL REGISTRATION No. 43

Registrant: Motonori Tomita, Takatoshi Tanisaka and Hirotada Yamagata (Fac. Agr. Kyoto University, Kyoto, Japan)

Gene symbol: gal

Gene name: gametic lethal

Character expression: lethality both for male and female gametes in coexistence with d-60

Origin: Koshihikari

Gene locus: Linkage group 11

Remark: Data on the segregations in F2-F4 and BF1 generations and linkage analysis are reported.

References.: Tanisaka, T., M. Tomita and H. Yamagata, 1990. Jpn. J. Breed. 40: 103-117. Tomita, M., T. Tanisaka and H. Yamagata, 1992. Jpn. J. Breed. (in press)

GENE SYMBOL REGISTRATION No. 44

Registrant: Seiji Yanagihara and Hiroshi Ikehashi (Fac. Agr. Chiba University, Matsudo, Chiba, Japan)

Gene symbol: S-7 (multiple alleles)

Gene name: Hybrid sterility

Character expression: Semi-sterility is expressed as an allelic interaction such as S-7ai/S-7cp.

Name of original line: Ketan Nangka for S-7kn, CP-SLO for S-7cp, Ingra for S-7ai and Banten or N 22 for S-7n

Remark: Data on the segregations in triple crosses and linkage analysis are reported.

Reference: Yanagihara, S., H. Kato and H. Ikehashi, 1992 Jpn. J. Breed. 42: 793-801.

GENE SYMBOL REGISTRATION No. 45

Registrant: Kazuyoshi Takeda (Res. Inst. Bioresources, Okayama University, Kurashiki, Japan) and Tsuneo Kato (Sch. Bioresources, Hiroshinia Prefectural University, Shobara, Japan)

Gene symbol: Ik-i-2

Gene name: 'IRAT 13' long grain

Character expression: One of the duplicate genes interacting with Ik-i

Name of original line: IRAT 13

Remark: Data on F2 and F3 segregations are reported.

Reference: Takeda, K. and T. Kato 1992. (RGN 9, Res. Note 18)

GENE SYMBOL REGISTRATION No. 46

Registrant: Tsuneo Kato (Sch. Bioresources, Hiroshima Prefectural University, Shobara, Japan) and Kazuyoshi Takeda (Res. Inst. Bioresources, Okayama University. Kurashiki, Japan)

Gene symbol: Lk-g

Gene name: 'Gimbozu mutant' long grain

Character expression: Long grain over 1.2 times longer than the normal counterpart

Name of original line: IMR 39: A long grain mutant derived from 'Gimbozu'.

Remark: Data on F2 and F3 segregations and allelism tests with Lk-f, Ik-i and lk-i-2 are reported.

References: Kato, T. 1990, SABRAO J. 22(2): 123-130. Kato, T. and K. Takeda, 1992, (RGN 9, Res. Note 17)

II. Current RFLP linkage maps

Current available data on RFLP linkage maps are presented by three groups. Further, morphological and physiological markers are inserted to RFLP maps by the two groups. Depending on the proposal on the occasion of the Second International Rice Genetics Symposium, Dr. Tanksley's lab and Dr. Saito's lab joined in the collaborative work to integrate the two kinds of RFLP maps and parts of their experiments are reported. These are presented as research notes (44, 45, 46, 47, 48 and 49) in this issue of RGN (T. Kinoshita).