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Production and Heterosis Analysis of Rice Autotetraploid Hybrids

^a Chengdu Institute of Biology, Chinese Academy of Sciences, P. O. Box 416, Chengdu 610041, China
^b USDA-ARS, Dale Bumpers National Rice Research Center, 2890 Hwy 130 E, Stuttgart, AR 72160

View larger version (48K): [in this window] [in a new window]   Figure 1. Autotetraploid Minghui 63 (right) induced by colchicines from diploid Minghui 63 calli had larger kernels with awns in various lengths as compared to its diploid parent Minghui 63 (left), commercial restorer line in the hybrid rice of cytoplasmic male sterile system.

View larger version (107K): [in this window] [in a new window]   Figure 2. Cytological examination of chromosome performance in the autotetraploid rice induced by colchicines from diploid calli showed 2n = 4x = 48 chromosomes.