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Meiotic study of intersectional hybrids between Arachis hypogaea, A. duranensis and A. diogoi with A. glabrata.

Authors
Publisher
International Crops Research Institute for the Semi-Arid Tropics
Publication Date
Keywords
  • Groundnut

Abstract

The hybrid between Arachis duranensis and A. glabrata was a triploid and had 8-11 bivalents with a mean of 10 bivalents per meiocyte. Ten bivalents were observed in 30% of the cells analysed. Trivalents were rarely observed. Forty-eight percent of the pollinations formed pegs when A. duranensis × A. glabrata was pollinated with A. hypogaea pollen. Morphologically, the hybrid had erect growth habit and resembled A. hypogaea. The flower buds had short hypanthium and flowers were pale yellow as observed on A. duranensis. Of the 485 pegs formed, 3 pods were obtained. Two of the pods had large but immature seeds and one pod had a mature seed. Triploid hybrid A. diogoi × A. glabrata was crossed with A. glabrata. The bivalent formation in the hybrid ranged from 7 to 10 with a mean of 9 per meiocyte. The number of univalents ranged from 10 to 16 with a mean of 12 per meiocyte. Both ring (4 per cell) and rod (6 per cell) bivalents were present. The occurrence of more number of rod than ringbivalents and of 12 univalents in 30% of the cells showed that there was some restriction in chromosome pairing in A. diogoi × A. glabrata. Meiotic pairing in A. hypogaea was normal with 20 ring bivalents in more than 95% of the meiocytes analysed. Although tetravalents (2.3 per cell), univalents (1.13 per cell) and occasionally trivalents (0.2 per cell) are observed in A. glabrata, 20 bivalents in a cell was not uncommon. The occurrence of 20 bivalents was rare in F1 hybrid whereas 7% of the meiocytes analysed showed the occurrence of 20 regular bivalents and regular anaphase separation of chromosomes. Majority of the cells analysed showed 14-15 bivalents per cell. Only 4% of the cells analysed showed bivalent formation of less than 13 per cell. Trivalents and tetravalents were more in A. hypogaea × A. glabrata than its BC1 hybrid.

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