By Kuldeep S. Labana, Surinder S. Banga, Shashi K. Banga
From gruesome duckling of agricultural plants to the Cinderella crop, the importance of oilseed brassicas in foreign exchange has elevated drastically with international produc tion having virtually trebled long ago 3 a long time. Over thirteen. 2% of the world's suitable for eating oil requirement is now met from this resource. The stimulus for this dramatic reversal was once supplied by way of the identity of rapeseed genotypes with significantly lowered degrees of nutritionally bad erucic acid and meal glucosinolates through the early Sixties. due to the fact then, rapeseed breeding has been orientated in the direction of the necessity to enhance oil caliber. even though prior achievements were notable, higher strides are anticipated in upgrading productiveness throughout the improvement ofF hybrids and higher mobiliza 1 tion of genetic variety to be had in wild allies. contemporary emphasis on mobile and molec ular biology can assist to avoid sexual constraints for genetic enrichment of crop bras sicas, and to minimize the timeframe for cultivar improvement. the current publication used to be conceived to assemble severe and accomplished reports on study ways, achievements and obstacles to breeding greater brassicas. because the ebook has a powerful sensible bias, yes themes like taxonomy, cytogenetics, and so forth. are handled in really lesser aspect. therefore, 'Brassica plants and wild allies', edited through S. Tsunoda, ok. Hinata and C. Gomez-Campa, will function a great spouse publication. it's a subject of titanic sorrow that the senior editor, Prof. ok. S.
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Additional info for Breeding Oilseed Brassicas
7. Selection in cell culture. Regeneration (including reploidization). Selection on level of regenerants. Testing of both the genetic basis and stability of each new trait. 9 Somaclonal Variation It is now well established that heritable variation occurs when plants are regenerated from protoplast, whole cell or callus cultures. This variation can be a useful supplement to normal breeding procedures. Somaclonal variants have been observed in Indian mustard for dwarfness (Jain et al. 1989) and yellow seed colour (George and Rao 1983); and for many agronomically useful characters in B.
In the majority of these cases, heterosis was evaluated either over mid-parental values or over the betterperforming parent in the cross. As was expected, negative or no heterosis was observed for the percent protein and oil content (Grant and Beversdorf 1985). Similar to the results in B. juncea, heterosis in oilseed rape was greater in hybrids between the parents of diverse origin. For example, maximum heterosis was manifested in Canadian x European crosses (Grant and Beversdorf 1985) or between European x Asiatic lines (Lefort-Buson et al.
Almost all the B. napus lines evaluated proved to be restorers of this system. No maintainer has yet been found (Pellan-Delounne et al. 1987). 4 Diplotaxis muralis System Hinata and Konno (1976) transferred the genome of B. campestris cv. Yukina to the 26 Heterosis and Its Utilization cytoplasm of Diplotaxis muralis through backcross substitution. The male sterile plants were characterized by indehiscent anthers and linear narrow petals. The female sterility was marginally reduced. This male sterility was highly influenced by atmospheric temperature (above 20 ·q.
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