Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 20:19-23 (1980)
© 1980 Crop Science Society of America
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Influence of Sink Removal in the Senescence Pattern of Wheat1

T. G. Patterson and W. A. Brun2

The influence of sink removal on leaf senescence was investigated in hard red spring wheat (Triticum aestivum L.). RuBP-carboxylase (RuBPCase) and glucose-6-phosphate dehydrogenase (G-6-PDH) were measured in the flag leaf blade, sheath, and penultimate leaf blade. Heads were removed from field plots of wheat at weekly intervals starting at anthesis. Early sink removal caused a dramatic dry weight increase in the peduncle. Later treatments had smaller effects. Flag leaf blade and sheath were more responsive, in general, to sink removal treatments that the penultimate leaf. Chlorophyll content of the leaves and sheath declined during the postanthesis period. Sink removal treatments delayed the loss of chlorophyll slightly, but did not reverse the downward trend. RuBPCase activity declined continuously during the experiment, and was slightly maintained by early sink removal treatments. G-6-PDH activity, in contrast, was strongly maintained by sink removal. RuBPCase and G-6-PDH activity determinations detected a delayed senescence response in wheat and were deemed suitable as screening techniques for altered senescence patterns.

Key Words: RuBP-carboxylase • Glucose-6-phosphate dehydrogenase • Chlorophyll • Post-anthesis period • Grain-filling period

1 Contribution from the Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108. Paper No. 10769, Scientific Journal Series.

2 Former graduate research assistant and professor of agronomy, Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, St. Paul. Present address of senior author: Boyce Thompson Inst. for Plant Res., Ithaca, NY 14853.

Received for publication April 30, 1979.




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