Annals of Botany 71: 317-326, 1993
© 1993 Annals of Botany Company
The Influence of the Rht1 and Rht2 Alleles on the Deposition and Use of Stem Reserves in Wheat
Plant and Soil Sciences Section, School of Agriculture and Forestry, University of Melbourne, Parkville, Victoria 3052, Australia
A field experiment was undertaken with a set of near-isogenic spring wheat lines (cv. Triple Dirk) to determine the influence of the Rht1 and Rht2 alleles on the deposition of carbon in the stem, and the subsequent use of these reserves during grain growth. The amount of dry matter stored and mobilized was estimated by the measurement of changes in masses of stem from frequent harvests. Deposition or absolute reserve was defined as the sum of the increments in mass in each segment of the large culm between the time that the segment ceased extending and the time that it reached maximum mass. The incorporation of the Rht1 and Rht2 alleles into a Triple Dirk background reduced the absolute amount of stored carbon in the stem by 35 and 39%, respectively. This was a consequence of the 21% reduction of stem height in Rht1 and Rht2 lines. Use or mobilization of reserve was defined as the sum of the decrements in mass in each segment of the large culm between maximum and maturity. The alleles did not confer an ability to mobilize more of the stored stem reserves in absolute terms, although the efficiency of use of stem reserves (i.e. use as a proportion of deposition) was higher in Rht1 than in rht or Rht2 . The possible contribution of stored carbon in the stem to final grain yield was estimated to be 22, 18 and 14% in the rht, Rht1 and Rht2 lines. In these estimates, the loss of mass was adjusted by 33% to allow for respiration. It was concluded that the larger stem reserves in rht wheats are of no real advantage under favourable environmental conditions, and may in fact be a disadvantage if the accumulation of that extra dry matter results in a reduction of sink size.Copyright 1993, 1999 Academic Press
Triticum aestivum L., Rht genes, stem reserves, deposition, mobilization, grain growth
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