Th                 Hard threshability (Kumar & Sharma 1982)
tms-1            thermosensitive male sterility-1 (Sun et al. 1989, Yang et al. 1992)
tms-2            thermosensitive male sterility-2 (Haruyama et al. 1991)
Tos-1*         Retrotransposon-1 (Chr.l, Fukuchi et al. 1992b, Hirochika et al. 1992)

Tpi-1(t)*    Triosephosphate isomerase-1 / Tpi-1l (t), Tpi-l2{t) (Morishima & Glaszmann 1990)
tpi*             triosephosphate isomerase (cloned gene) (Chr.l, Fukuda et al. 1994)

tri                 triangular hull (Chr.2, Nagao 1951, Iwata & Omura 1971b, Iwata et al.
                    1989a, Yoshimura et al. 1992a)
ts-a             twisted stem / complementary (Chr.l, Hsieh 1960)
ts-b             twisted stem (Hsieh 1960)

tsv-l             rice tungro spherical virus resistance-1 (Shahjahan et al. 1991, Ebron et al. 1994)
tsv-2            rice tungro spherical virus resistance-2 (Ebron et al. 1994)
Tuv-a           Tungro resistance / complementary (Toriyama 1967)
Tuv-b            Tungro resistance (Toriyama 1967)

U

Un-a             Uneven grain / complementary (Chr.6, Thakur & Roy 1975)
Un-b             Uneven grain (Chr.7, Thakur & Roy 1975)
Ur-1             Undulate rachis-1 (Chr.6, Nagao & Takahashi 1963, Kinoshita 1984)
ur-2                 undulate rachis-2 (Chr.8, Iwata et al. 1983, Iwata & Omura 1984)

V

v-l             virescent-1 (Chr.3 or 6, Jodon 1940, 1955, Iwata & Omura 1977, 1984, Iwata et al. 1985, Omura et al.
                1978)
v-2            virescent-2 (Chr.3, Omura et al. 1978, Iwata et al. 1979b, Iwata & Omura 1984)
v-3            virescent-3 (Chr.6, Omura et al. 1978, Iwata & Omura 1984)
v-4             virescent-4 (Chr.11, Iwata et al. 1977, 1978b, Omura et al. 1978)
v-5             virescent-5 (Chr.3, Omura  et al. 1978, Iwata et al. 1981)
v-6            virescent-6 (Chr.l, Iwata et al. 1979a, Iwata 1990)
v-7            virescent-7 (Chr.3, Iwata et al. 1979b)
v-8            virescent-8 (Chr.8, Iwata et al. 1983, Iwata 6 Omura 1984,  Khush et al. 1984,  Ideta et al. 1994a)
v-9             virescent-9 (Chr.11, Satoh et al. 1984, Ideta et al. 1993b)
v-10         virescent-10 (Chr.5, Satoh et al. 1984, Satoh & Iwata 1990)
v-11          virescent-11 (Chr.7, Satoh et al. 1984, Ideta et al. 1994a)

w

Wc*             Wide compatibility (Chr.6, Kumar & Virmani 1992. Liu et al. 1992)
(S-5n,Sn)
wgl(t)*         spikelet width /wgln(t) (Chr.5, Kajiya et al. 1995)
Wh                White hull (Chr.4, Jodon 1957, Nagao & Takahashi 1963)
wp-1             white panicle-1 (Chr.7, Sanchez & Khush 1994)
Wph-l             White-backed planthopper resistance-1 (Chr.7, Sidhu et al. 1979,
(Wbph)         Angeles et al. 1981, McCouch et al. 1991b, Tanksley et al. 1993)

Wph-2         White-backed planthopper resistance-2 (Angeles et al. 1981)
Wph-3         White-backed planthopper resistance-3(Hernandez & Khush 1981)
wph-4         white-backed planthopper resistance-4 (Hernandez & Khush 1981)
Wph-5         White-backed planthopper resistance-5 (Wu & Khush 1984, Singh et al. 1990)
Wph-6(t)*     White-backed planthopper resistance-6 (Min et al. 1991)

wx,Wx         glutinous endosperm / wxop, Waxy protein  / Wxa, Wxb (Chr.6, Nagao &
(am)             Takahashi 1963, Sano 1984, Satoh & Omura 1986, Heu & Kim 1989,
                    Sano et al. 1991, Ideta et al. 1993a. Li et al. 1994a, b)
x

Xa-1            Xanthomonas campestris    pv. oryzae resistance-1 / Xa-1h (Chr.4,
(Xe)            Sakaguchi 1967, Yamada & Horino 1981. Yoshimura et al. 1992d,e, 1994, 1995)
Xa-2            Xanthomonas campestris pv. oryzae resistance-2 (Chr.4, Sakaguchi 1967,
                    Ezuka et al. 1975, Yoshimura et al. 1994)

Xa-3            Xanthomonas campestris pv. oryzae resistance-3 (Chr.ll, Ezuka et al. (= Xa- 4b, 1975, Ogawa et al. 1978,
                    1986a, b,c, 1987a, 1990a,b,c, Sidhu & Khush 6, 9, Xa- w) 1978a, Singh et al. 1983, Ogawa & Yamamoto
                    1986, Yoshimura et al. 1992 c,e, 1993, 1994)
Xa-4             Xanthomonas  campestris pv. oryzae resistance-4 (Chr.ll or 7?,
(Xa-4a)         Petpisit et al. 1977, Sidhu et al. 1978, Singh et al. 1983, Sur & Khush 1984, Ogawa et al. 1986c, 1987a, McCouch
                      et al. 1991b, Yoshimura et al.1992c,e, 1993, 1994)
xa-5               Xanthomonas  campestris pv. oryzae resistance-5 (Chr.5, Petpisit et al. 1977, Sidhu et al. 1978, Singh et al. 1983,
                       Yoshimura et al. 1983, 1992b, McCouch et al. 1991a)
Xa-7                 Xanthomonas campestris pv. oryzae resistance-7 (Chr.6, Sidhu et al. 1978,Singh et al. 1983,
                        Kaji and Ogawa 1995, Ogawa 1995)

xa-8             Xanthomonas campestris pv. oryzae resistance-8 (Sidhu et al. 1978, Singh et al. 1983)
Xa-10            Xanthomonas campestris pv. oryzae resistance-10 (Chr.ll, Yoshimura et al.1984, 1993)

Xa-11         Xanthomonas campestris pv. oryzae resistance-ll (Ogawa & Yamamoto (Xa-pt) 1986, Ogawa et al. 1991)

Xa-12         Xanthomonas campestris pv. oryzae resistance-12 / Xa-12h (Xakgh) (Xa-kg) (Chr.4, Ogawa et al. 1978,
                    Yamada & Horino 1981, Yamada 1984)
xa-13            Xanthomonas campestris pv. oryzae resistance-13 (Chr.5, Ogawa et al. 1987b, Sahu & Khush 1989)
Xa-14         Xanthomonas campestris pv. oryzae resistance-14 (Chr.4,  Taura et al. 1987)
xa-16          Xanthomonas campestris pv. oryzae resistance-16 (Noda & Ohuchi 1989)
Xa-17         Xanthomonas campestris pv. oryzae resistance-17 (Ogawa et al. 1989)
Xa-18         Xanthomonas campestris pv. oryzae resistance-18 (Yamamoto & Ogawa 1989)
xa-19         Xanthomonas campestris pv. oryzae resistance-19 (Taura et al. 1989, 1991)
xa-20         Xanthomonas campestris pv. oryzae resistance-20 (Taura et al. 1989, 1992,  Ikeda et al. 1991, 1992a)
Xa-21*       Xanthomonas campestris pv. oryzae resistance-21 (Chr.ll, Khush et al. 1990, Ikeda et al. 1991,
                   Ronald & Tanksley 1991, Ronald et al. 1992, 1994,  Abenes et al. 1994)
Xa-a*         Xanthomonas campestris pv. oryzae resistance (Chr.ll, Yu et al. 1986, Lin et al. 1991)
Xa-h*         Xanthomonas campestris pv. oryzae resistance (Chr.ll, Yu et al. 1986)
 

xa-k*        Xanthomonas campestris pv. oryzae resistance (Chr.7, Lin  et al. 1991)
xa(t)*        Xanthomonas campestris pv. oryzae resistance (Chr.8, Zhang et al. 1994a)
xa-nm(t)*     Xanthomonas campestris pv. oryzae resistance-nm (Nakai 1989)
Xdh-l(t)*     Xanthine dehydrogenase-1 / Xdh-11(t) , Xdh-12(t) (Reyes et al. 1989)

Y Ydv         Yellow dwarf disease resistance (Horinaka et al. 1970)
ygl*         yellow green leaf (Chr.10, Librojo & Khush 1986)
ylb          yellow banded leaf blade (Chr.5, Hsieh 1961)
ylm         yellow leaf margin (Chr.4, Iwata & Omura 1977, 1984)
yp*         yellow panicle (Rutger et al. 1986)
ysl           yellow leaf spot (Takahashi et al. 1968)

z-l            zebra-1 (Chr.11, Iwata & Omura 1975, 1977, 1984)
z-2           zebra-2 (Chr.11, Iwata & Omura 1977, 1984, Iwata et al. 1978b, 1984,Ideta et al. 1993b, Abenes et al. 1994)
z-3          zebra-3 (Chr.3, Iwata et al. 1977, 1979b, 1985)
z-4          zebra-4 (Chr.8, Iwata et al. 1983, Iwata & Omura 1984)
z-5           zebra-5 (Chr.4, Kinoshita & Takamure 1984)
z-6          zebra-6 (Chr.7, Maekawa 1987, Maekawa et al. 1991b)
z-7          zebra-7 (Chr.5, Sanchez & Khush 1992. 1994)
z-8           zebra-8(Chr.l, Sanchez & Khush 1992, 1994)
z-9           zebra-9 (Chr.3, Sanchez & Khush 1992, 1994, Reyes et al. 1993)
z-10         zebra-10 (Chr.7, Sanchez & Khush 1992, 1994)
z-11         zebra-11 (Chr.2, Sanchez & Khush 1992, 1994)
z-12         zebra-12 (Chr.2, Sanchez & Khush 1992, 1994)
z-13        zebra-13 (Chr.6, Sanchez & Khush 1992, 1994)
Zlh-l         Zigzag leafhopper resistance-1 (Angeles et al. 1986)
Zlh-2        Zigzag leafhopper resistance-2 (Angeles et al. 1986)
Zlh-3         Zigzag leaf hopper resistance-3 (Angeles et al. 1986)
zn             zebra necrosis (Chr.6, Kinoshita & Takamure 1984, Maekawa et al. 1991b)

* Not registered in Rice Genetic Cooperative.