Abstract
The present study was carried out to evaluate genetic divergence among eleven japonica rice cultivars and to assess the relationship between genetic distance and hybrid performance in partial non-reciprocal crosses among them. The 44 F1 hybrids along with the eleven parents were evaluated for five cold tolerance-related traits; discoloration at seedling stage, days to heading, culm length, fertility, and spikelets per panicle in a cold water screening nursery (17 °C). The eleven parents were examined for DNA polymorphism using amplified fragment length polymorphisms(AFLPs). A total of 855 polymorphic variants were generated and based on the polymorphism data, genetic distances (GDs) ranged from 0.023 to0.524. Very little heterosis was observed in hybrids for most of the traits,whereas heterosis was high for fertility. The correlation values of GDs with F1 performance were mostly non-significant except for discoloration and fertility. The correlations of GDs with mid-parent and better-parent heterosis were not significant and proved to be of no predictive value. Our results indicate that GDs based on AFLP markers are not useful for predicting heterosis for cold tolerance in japonica hybrids.
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Kwon, SJ., Ahn, SN., Jeong, EG. et al. Relationship between genetic divergence and hybrid performance in japonica rice grown in a cold water-irrigated field. Euphytica 128, 389–396 (2002). https://doi.org/10.1023/A:1021247724233
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DOI: https://doi.org/10.1023/A:1021247724233