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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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