PHOTOSYNTHESIS IN A LINE OF WHEAT NULLISOMIC FOR CHROMOSOME 3D (XVI)

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Abstract
No C14-labelled chlorophyll was detected in the fully expanded leaves of the wheat varieties Rescue (Triticum aestivum), Golden Ball (T. durum), their normal hexaploid F5 hybrid, or its sister selection nullisomic for chromosome 3D (XVI), when they were fed C14O2 for 4 hours under illumination. The nullisomic had a ratio of labelled carotenes to xanthophylls different from that of the other varieties, and it resembled Golden Ball in having a high amount of C14 in the hot water-soluble extract. The normal hexaploid hybrid was low in labelled glycine and serine. The differences between the nullisomic and the 2 hexaploid wheats were probably due to the loss of chromosome 3D. The deficiency of glycine and serine in the normal hexaploid hybrid may have been due to an unbalanced system produced by interaction of genes from Golden Ball with those on chromosome 3D.