Translocation and distribution of photosynthates in Japanese and Dutch tomato cultivars with low node-order pinching and high-density planting under salt stress condition

In this study, we investigated differences between the Japanese tomato (Solanum lycopersicum) cultivar ‘CF Momotaro York’ and the Dutch tomato cultivar ‘Endeavor’ in translocation and distribution rate of photosynthates to the fruit in relation to sink strength with low node-order pinching and high-density planting system under salt stress condition.
The fresh and dry fruit yields of ‘CF Momotaro York’ were significantly higher than those of ‘Endeavor’. Fruit dry weight partitioning in ‘CF Momotaro York’ was also significantly higher than that in ‘Endeavor’. The percentage translocation rate of ¹³C assimilates from the leaf to the other parts and amount of ¹³C assimilates translocated to the fruit showed no significant differences between the two cultivars.
However, the percentage distribution of ¹³C assimilates to the fruit was significantly higher in ‘CF Momotaro York’ than that in ‘Endeavor’. These results indicated that the decrease in fruit yield of ‘Endeavor’ was a result of reduced distribution of photosynthates to the fruit, and increased consumption of photosynthates in the fruit under the salt-stress condition.
In addition, translocation activity in source leaves was not significantly different between the two cultivars, however, the fruit sink strength was higher in ‘CF Momotaro York’ than that in ‘Endeavor’ under the salt-stress condition.

International Symposium on Advanced Technologies and Management for Innovative Greenhouses: GreenSys2019

K. Maeda, M. Johkan, S. Tsukagoshi, T. Maruo

¹³C, assimilate, sink strength, fruit quality, fruit dry weight partitioning

https://doi.org/10.17660/ActaHortic.2020.1296.113