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Hybrid grass clump dwarfness in wheat physiology and genetics



Hybrid grass clump dwarfness in wheat physiology and genetics



Euphytica 25(2): 471-483



The growth of all Triticum aestivum grass-clump dwarfs is sensitive to temperature, with low temperature giving rise to the grass-clump phenotype and high temperature producing normal phenotype. A continuous temperature of 26.degree. C is required for normal growth of Type 1 dwarfs; a continuous temperature of 21.degree. C is required for normal growth of Type 2 dwarfs, and a continuous temperature of 16.degree. C is required for normal growth of Type 3 dwarfs. Genetic studies show that the inheritance of the grass-clump characteristic is due to 3 complementary dominant genes. The grass-clump growth habit is produced as a result of the temperature sensitivity of the apical meristem. In grass-clump plants low temperature treatment results in the cessation of cell division, DNA synthesis and phospholipid synthesis in the apical meristem. The primary temperature lesion was not identified. Prolonged low temperature treatment of grass-clump plants results in extensive cell necrosis in a region just below the apical meristem; this cell death results in the permanent inactivation of the apical meristem.

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Accession: 005597041

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DOI: 10.1007/bf00041581


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