ISSN:
1439-0523
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Several R2 somaclonal families were derived from plants regenerated from a salt-resistant callus of the salt-sensitive rice cultivar ‘I Kong Pao’ (IKP). The family R2-1-23, in the presence of NaCl exhibited higher yield performances than the initial cultivar. This improvement in salinity resistance, however, was not transmitted to following generations; despite a higher number of spikelets per plant, family R3-1-23 did not perform better than the initial cultivar because of a very low seed set. This somaclonal family, its initial being the cultivar IKP, the breeding line IR31785 (extremely salt-sensitive) and the cultivar ‘Aiwu’ (moderately salt-resistant), were used as parents for production ofhybrids. Four crosses, IKP×R3-1-23, IR31785 ×R3-1-23, IR31785× IKP and IKP בAiwu’, were performed. Most of the F1 hybrids cultivated in the absence of salt exhibited increased performances compared with the mid-parent, suggesting an heterosis effect for yield-related parameters. F2 populations were screened for salinity resistance and a clear improvement for yield in stress conditions was recorded for populations derived from IK×R3-1-23, IR31785×R3-1-23 and IR31785×IKP, although the mean level of increase over the mid-parent (RIMP) varied depending on the population, the presence or absence of stress, and the quantified parameters. The results are discussed in relation to the usefulness of in vitro selection for obtaining interesting somaclonal variants useful to be integrated in classical breeding programmes for salinity resistance in rice.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1046/j.1439-0523.2000.00517.x
Permalink
