Combining ability of the response to boron deficiency in wheat
Jamjod, S. | Rerkasem, B. (Chiang Mai University, Chiang Mai (Thailand). Faculty of Agriculture, Agronomy Department) | Mann, C.E. (Centro Internacional de Mejoramiento de Maiz y Trigo, Bangkok (Thailand))
Seven wheat lines and their F1 hybrids from a diallel cross were grown in sand culture from November 1990 to February 1991. Plants were watered twice daily with a complete nutrient solution supplying a low level of boron at 0.2 mM. Plant response was measured as the average number of grains set in the two basal florets (F1+2) of 10 central spikelets of the wheat ears. Grain set in low boron (B) was significantly different among parents and offsprings. General combining ability (GCA) and specific combining ability (SCA) were highly significant (p0.01). The GCA effects were the major factor that controls this character. SCA effects were smaller and found to be positive in six crosses between susceptible x tolerant and tolerant x tolerant lines. This indicates that it may be possible to transfer the B deficiency tolerance character to susceptible lines by a backcrossing program. The positive GCA effects of tolerant lines suggest that these lines can be useful in breeding for more tolerance in problem areas
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