Abstract
Yellow mustard (Sinapis alba L.) has been grown as an important source of condiment for the spice trade in the world. It is an obligate outcrossing species due to its sporophytic self-incompatibility (SI). To utilize heterosis for yield potential, we have attempted to develop elite component inbred lines for producing high-yielding synthetic varieties for this crop. The open-pollinated variety Andante was used as the initial population. To circumvent the SI barrier, bud-pollination for selfing was performed on the selected initial (S0) plants. Various types of inbreeding depression were observed in the S1 generation. Elite inbred lines tolerant to inbreeding were produced by purging the deleterious alleles in each inbred generation. Self-compatible (SC) lines were developed for the first time in this species. There were three types of erucic variants (high: 49.9%, median: 23.9% and low: 1.4%), three types of linolenic variants (high: 18.5%, median: 13.8% and low: 3.8%) and two types of mucliage variants (high: 164.0 cS*mL/g and low: 12.0 cS*mL/g) among the developed inbred lines. These variants are being used to investigate the genetic and molecular mechanism underpinning the phenotypic variation of the seed oil profile and SI/SC traits in yellow mustard.
Highlights
Yellow mustard (Sinapis alba L.) has been grown as an important source of condiment for the spice trade in the world
Yellow mustard has much lower seed yield compared with canola B. napus, brown and oriental condiment mustard B. juncea
Heterosis for seed yield and number of siliques per plant in the hybrids between inbred lines was demonstrated in yellow mustard [9]
Summary
Yellow mustard (Sinapis alba L.) has been grown as an important source of condiment for the spice trade in the world. Heterosis breeding has proven to be a very successful approach for significant increase of seed yield in many crops. Heterosis for seed yield and number of siliques per plant in the hybrids between inbred lines was demonstrated in yellow mustard [9]. The self-incompatible reproductive system in yellow mustard makes it difficult to develop and maintain inbred lines for use as parents in hybrid breeding. Utilizing (partial) heterosis in synthetic varieties is an alternative approach for increasing the seed yield in yellow mustard in the short term. The elite inbred lines tolerant to inbreeding will be identified and used as components for making high yielding synthetic varieties. It is of particular interest that we have obtained some self-compatible inbred lines in yellow mustard
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