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Problems in the breeding of millet (Setaria italica (L.) Beuav.)

Li, H.W., Meng, C.J., Liu, T.N.
Agronomy journal 1935 v.27 no.12 pp. 963-970
Setaria italica, plant breeding, hybridization, flowering, crossing, cell biology, temperature, duration
1. There are two maximum periods of blooming in millet, one between 4 and 7 a. m. and another between 9 p. m. and midnight. In 1933, when the temperature was cooler, the first maximum was three times as high as the second. In 1934, when the temperature was higher, both periods were of about the same intensity. There was practically no blooming between noon and 6 p. m. 2. The rate of blooming was negatively correlated with temperature and positively correlated with humidity. 3. The percentage of natural crossing was found to be 5.60 +/- 2.10 in 1933 and 7.63 in 1934, using the same material in both years but applying different criteria. 4. A method of artificial hybridization is described. 5. The somatic number of chromosomes of Setaria italica and S. viridis was found to be 18, and their haploid number 9.