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The Journal of Heredity 1983:74(4):292-296
© 1983 The American Genetic Association 74:292-296

research-article

Meiotic instability in Hordeum vulgare x Triticum aestivum hybrids

A. Mujeeb-Kazi, and R. Rodriguez

Apdo. Postal 6–641, Londres 40, Delg. Cuauhtcmoc 06600. Mexico, D.F.

Abstract

Hordeum vulgare x Triticum aestivum hybrids (n = 4x = 28, HABD) expressed meiotic instability, with meiocytes possessing a hyper-or hypoploid composition. Meiotic restitution aided backcross-1 (BC1 seed formation when the hybrids were pollinated by the respective T. aestivum cultivars. The BC1 seed-set range was (H. vulgare cv. Manker x T. aestivum cv. Bonza) x cv. Bonza < (cv. Manker x cv. Pavon) x cv. Pavon < (cv. Manker x cv. Chinese Spring) x cv. Chinese Spring. Gibbereliic acid (75ppm) applied twice to the florets as a post-pollination treatment assisted BC seed set. Apart from the expected BC1 heptaploid somatic count of 2n = 7x = 49, HAABBDD, BC1plants also possessed a somatic range from 27 to 50. These variations are attributed to apomixis and F1 meiotic instability. Pollinating the self-sterile BC1 plants with T. aestivum produced BC2 progeny. Chromosome composition of the BC2 plants was within the normal limits of expectation based on random loss of barley chromosomes. The BC2 progeny advanced to BC3 did not produce any self-fertile plants. Self-sterility was resolved by producing the re ciprocal (T. aestivum x H. vulgare) hybrid and advancing it to BC2 where all plants were self-fertile. The wheat phenotype was dominant.


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