Abstract
Genetics of tolerance to iron chlorosis was investigated in eight crosses involving parents distinctly different in their level of tolerance. The segregating populations with parents and F1s were screened under actual stress conditions in the field. Also, selected crosses were studied for Fe3+ uptake capacity. Tolerance/moderate tolerance to Fe chlorosis was dominant over susceptibility and it was controlled by two sets of nonallelic genes with complementary interaction. Gene Ic 1 has been found to be basic and in complementation with Ic 3 it confers tolerance. Likewise, Ic 2 with Ic 4 confers tolerance. The basic genes Ic 1 and Ic 2 are nonallelic and, in the absence of their respective complementary genes Ic 3 and 4 , ineffective, which results in susceptibility. Of tolerant cultivars, ARC 10372 and Cauvery have been tentatively assigned the genotype of Ic 1 , Ic 2 , Ic 3 , Ic 4 , and moderately tolerant IET 7613, Prasanna and Akashi Ic 1 , 2 Ic 3 Ic 4 . The susceptible ARC 5723 has been assigned Ic 1 , 2 , Ic 3 , Ic 4 , and IET 9829, Ic 1 , 2 Ic 3 Ic 4 . IET 7614 is susceptible, due to the presence of inhibitory genes I-Ic 1 , I-Ic 2 together with ic 1 pt>, ic 2 , Ic 3 , Ic 4 . Further, the gene Pc for purple coleoptile shows linkage with one of the complementary genes with a crossover value of 15.26%, while the gene(s) for seedling height Ts with Ic 1 with a crossover value of 1.7%. It is possible that the gene(s) for iron chlorosis tolerance might belong to the second linkage group, where genes for purple leaf were located.
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Hoan, N.T., Prasada Rao, U. & Siddiq, E.A. Genetics of tolerance to iron chlorosis in rice. Plant Soil 146, 233–239 (1992). https://doi.org/10.1007/BF00012017
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DOI: https://doi.org/10.1007/BF00012017