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Identification and Characteristic Analysis of Interspecific Hybrids of Peanut
The meiosis of the interspecific hybrid F1 at metaphase I stage, the chromosome number in each cell is about 40-60
The meiosis of the interspecific hybrid F1 at metaphase I stage, the chromosome number in each cell is about 40-60

Author:Huey-Jiusn Husng, Wen-Long Tsaur, Shun-Fu Lin, Jaw-Shu Hsieh and Jhi-Nong Tsai

Abstract:

To improve disease resistance to rust and leaf spots, eight introduced wild species of peanut germplasm were crossed with cultivars grown in Taiwan. The F1 plants of cross combinations were confirmed to be triploid by the examination of chromosome number and RAPD analysis. By colchicine treatment or spontaneous diploidization, the interspecific F1 hybrids could produce ameiotic spores namely, 2N pollen, thus various numbers of chromosome were observed in the F2 progenies (2n = 40 - 60). Some of the F2 plants were fertile, and the progenies were propagated to F5 generation. The results of rust pathogen inoculation for interspecific F5 hybrid progenies were summarized as follows : The resistance for rust of wild type peanuts were different from the slow resistant mechanism of cultivars. The wild type peanuts have the different genes for rust resistance, such as the resistance of A. chacoense was immunity, and the resistance of A. villosa and A. spegazzinii were partial dominance.

Key words:Cultivated peanut (Arachis hypogaea), Wild peanut, Interspecific hybrid

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Journal of
Taiwan Agricultural Research
Vol. 73, No.1 (2024) ISSN: 2790-086X Vol. 73, No.1 (2024)
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