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Endosperm dna content and dry matter accumulation in the developing grain of hexaploid triticales and parental species



Endosperm dna content and dry matter accumulation in the developing grain of hexaploid triticales and parental species



Zeitschrift fuer Pflanzenzuechtung 95(4): 342-351



The developing grain of four hexaploid triticales and the parental durum wheats [Triticum durum] and rye [Serale cereale] have been analysed to investigate the relationship between the variation of the endosperm DNA content and the accumulation of dry matter. In wheat, quite a few days intervened between the end of DNA accumulation and the cessation of seed growth. During this period an intensive accumulation of storage material took place and plump grains were produced. In the hexaploid triticales, the synthesis of DNA continued for a longer time than in wheat, whilst seed growth duration was about the same. The long phase of DNA synthesis might limit to a few days the period for an effective accumulation of dry matter, and so reducing the chance for an efficient filling of the grain. In advanced stages of seed development, after the death of pericarp cells, in wheat and rye the DNA content per endosperm attained a constant value, but it kept decreasing in the triticales until the seed was dry, indicating a process of nuclear degradation, the intensity of which appeared correlated to the frequency of severely shrunken grain.

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Accession: 005359808

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