Selection of Self-incompatibility Maternal Line for Leaf Mustard Hybrid Improvement
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Abstract
Leaf mustard seed cannot be produced in Thailand therefore, all seeds have been imported for pickled leaf mustard factories. The development of hybrid varieties is, however, possible through many alternative means. Using the self - incompatible maternal line is one of the most popular methods for hybrid seed production in Brassicaceae, this research aims at selecting the inbred line that is self - incompatibility to be used as maternal line for hybrid seed production and evaluating the hybrids for satisfying the needs of the manufacturers. The result showed that 4OR - 17, 2M - 23, and 19H9 - 9 are in the weak - self - compatibility (WSI) group. The evaluation of the six hybrids reveals that the cross of 19H16x2M-3(H6) produced a yield weight of 2,935 kg / rai and is significantly different from the parental lines. However, the head after trimming was larger than the size required for processing. Meanwhile, the cross of 2M-23x4OR-17(H4) produced 2,726 kg / rai in yield weight which is not significantly different from the commercial varieties, the head weight of 342 g / head, with 7.9 centimeters in length, and 8.0 centimeters in width. This combination is suitable for processing due to its high yield weight, proper head size, as well as having appropriate solidity of the head. Moreover, it showed positive heterosis in yield weight per rai and head shape index.
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