K. kobayashi1, R. ishikawa1, M. senda2, s. akada2, t. harada1 and M. niizeki 1
1 ) Faculty of Agriculture, Hirosaki University, Hirosaki. 036 Japan
2) Gene Research Center, Hirosaki University, Hirosaki, 036 Japan
We made a new classification of glabrous mutants showing differential morphological modifications of micro and macro hairs, as well as density of these hairs. First, gla-
Rice Genetics Newsletter Vol. 14
Table 1. Six glabrous phenotypes on adaxial side leaves and on glumes
1) Macro hairs only on mid-rib. 2) Wild type or round edge hairs on leaves.
Fig. 1. Surface of adaxial side mature leaf observed with SEM. a: Wild type Acc504. b: Type
brous phenotypes were screened for glumes and mature leaves. Thirty-six out of 1287 strains were selected with modified phenotypes. One mutant classified as Type 6 had only glabrous leaves but had apiculus hairs on glumes. Other mutants have no apiculus hair on glumes. Type 6 is characterized with low density of wild type hairs or round-edge macro hairs only on mid-rib, but has normal apiculus hair on glumes. Mature leaves were observed with a scanning electron microscope (SEM). Thirty-six mutants examined were classified into in six different phenotypes (Table 1, Fig. 1).
We have not conducted allelism test between these glabrous mutants as yet. However, these qualitative differences suggest that they may have different genes for trichome development. Allelism tests will be carried out.
References
Oka, H.I., 1953. Phylogenetic differentiation of the cultivated rice. 1. Variations in various characters and
character combinations among rice varieties. Japan. J. Breed. 3:
33-43. Hosikawa,K.,1975. Growth of rice. Noubunkyo, Tokyo, pp.90.