CHINESE COMMON WILD RICE CLOSE TO JAPONICA TYPE

Ping-Yong YUAN1, Y.Z. ZHANG1 and H.W. CAI2

1Yunnan Academy of Agricultural Sciences, Kunming, 650205 China; 2Beijing Agricultural University, Beijing, 100094 China. (Published with permission from the original in the Rice Genetics Newsletter 1992(9):36). Edited for the website by B. Gordon).

Morishima (1986, 1987) said Chinese common wild rice (O. rufipogon) showed primitive growth habit and traits like japonica type. A survey of small samples of foreign and indigenous wild rices led us to the same conclusion. Chinese wild rice differed from foreign ones significantly in flag-leaf width (narrower), its length/width ratio (larger), fertile seed number per panicle (smaller), and percent seed set when bagged (smaller; Table 1).

Character

Chinese

Foreign

Difference

No. of strains observed

13

12

 

Flag-leaf width (cm)

0.86

1.06

0.19+/-0.06*

L/W ratio of flag-leaf (%)

43.6

29.7

13.9+/-5.81**

Spikelets per panicle

41.6

51.2

9.6+/-7.31

Fertile seeds/panicle

7.9

28.2

20.3+/-4.86*

Seed setting rate (%)

20.2

54.8

34.6+/-9.16*

Table 1. Mean character values of Chinese and foreign wild rices *P<0.05, **P<0.01.

Esterase isozymes characterizing japonica and indica types were 58.1 and 22.1%, respectively, in Chinese wild strains, and 19.3 and 47.7% in foreign ones. All agree with Morishima & Gadrinab (1987, Fig. 4).

References:

Morishima, H., 1986. Wild progenitors of cultivated rice and their population dynamics. Rice Genetics, p. 3-14, IRRI, Manila.

Morishima, H. & L. U. Gadrinab, 1987. Are Asian common wild rices differentiated into indica and japonica types? Crop Exploration and Utilization of Genetic Resources, p. 11-20. Taichung District Agricultural Improvement Station, Changhua, Taiwan (ed. S. C. Hsieh).