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Abstract
Two experiments were conducted to determine if malate and citrate change diurnally, if these changes are light dependent, and how these changes relate to K+ and NO3 −1 levels. Malate concentration in tomato leaves was shown to increase during the day and decrease at night. The inverse occurred with citrate. The dependency of the changes on light was demonstrated for malate, but not for citrate. A relationship with NO3 − assimilation and K+ recirculation may explain the changes in malate concentration.
Notes
Funded by the North Carolina Agricultural Research Service (NCARS), Raleigh, NC 27695–7643. Use of trade names in this publication does not imply NCARS endorsement of products named nor criticism of others not mentioned.
Present address: North Carolina Cooperative Extension Program, North Carolina Agricultural and Technical State University, Greensboro, NC 27420–1928.
Dept of Soil Science, North Carolina State University, Raleigh, NC 27695–7619.
