Effects of Light Quality and Intensity on Diurnal Patterns and Rates of Photo-Assimilate Translocation and Transpiration in Tomato Leaves.

ABSTRACT: Translocation of assimilates is a fundamental process involving carbon and water balance affecting source/sink relationships. Diurnal patterns of CO₂ exchange, translocation (carbon export), and transpiration of an intact tomato source leaf were determined during ¹⁴CO₂ steady-state labeling under different wavelengths at three pre-set photosynthetic rates. Daily patterns showed that photosynthesis and export were supported by all wavelengths of light tested including orange and green. Export in the light, under all wavelengths was always higher than that at night. Export in the light varied from 65-83% of the total daily carbon fixed, depending on light intensity. Photosynthesis and export were highly correlated under all wavelengths (r = 0.90-0.96).

SUBMITTER: Lanoue J 

PROVIDER: S-EPMC5994434 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature