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Development of Fusarium Wilt-resistant Genotypes in Safflower (Carthamus tinctorius)

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Abstract

Screening of 51 promising safflower germplasm lines in Fusarium wilt-infested plots resulted in identification of highly wilt-resistant selections viz., 86-93-36A, 237550, VI-92-4-2 and II-13-2A, with some moderate resistance in HUS-305. Progenies from crosses made using these resistant lines were tested for their reaction to wilt. F1 progenies from 86-93-36A × 237550 and 86-93-36A × II-13-2A recorded zero wilt incidence, while 237550 × 86-93-36A was highly resistant to the Rajendranagar geographical isolate. The reaction for the three progenies showed stability for wilt resistance with no segregation until the F7 generation. Geographical isolates of Fusarium oxysporum f. sp. carthami (Foc) were collected from different safflower growing regions and tested for their pathogenic variability on six host differentials under glasshouse conditions. Based on the reaction of the differentials, the Foc isolates were grouped into four biotypes. The three resistant progenies were tested for their reaction to the four biotypes. The progeny of cross 86-93-36A × 237550 showed an immune reaction to all the biotypes, except for a highly resistant reaction to biotype 3. The progenies of the two other crosses (86-93-36A × II-13-2A and 237550 × 86-93-36A) exhibited immune reactions to biotypes 2, 3 and 1, 3, respectively, and were highly to moderately resistant to biotypes 1, 4 and 2, 4, respectively.

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Correspondence to C. Chattopadhyay.

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Kalpana Sastry, R., Chattopadhyay, C. Development of Fusarium Wilt-resistant Genotypes in Safflower (Carthamus tinctorius). European Journal of Plant Pathology 109, 147–151 (2003). https://doi.org/10.1023/A:1022502618887

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  • DOI: https://doi.org/10.1023/A:1022502618887

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