Inheritance of nitrogen efficiency under aluminum stress in upland rice lines
2003
Jagau, Y. | Makmur, A. | Aswidinnoor, H. | Sutjahjo, S.H.
Four upland rice lines differing in nitrogen (N) efficiency, Krowal and Banih Kuning (N-efficient lines) and CT6510-24-1-3 and Grogol (N-inefficient lines), were used in crosses. Six generations (P1, P2, F1, F2, BC1, and BC2) of each cross-combination were grown simultaneously in Yoshida nutrient solution with 5 ppm N and 45 ppm Al. After 14 d, seedling dry weight and tissue N content were measured. Seedling and dry weight N-use efficiency (NUE) were controlled by nuclear genes (no maternal effect). The variability for both characters was controlled by the effect of additive [d], dominance [h], additive x additive interaction [i], and dominance x dominance interaction [l]. The environmental effect for both characters was high, whereas the broad-sense heritability values were low. Based on narrow-sense heritability, although the variability of both characters was controlled by the additive, dominance, and interaction effects, the additive effect had a higher effect than the others. The higher additive effect for both characters allows selection of N-efficient lines, but the selection must be done in later generations.
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