Nutrio-physiological studies on the tomato plant II. Translocation of photosynthates

Partitioning of photosynthates between panicle and vegetative organs of rice under different planting densities

“…The leaf sheath seems to have an advantage over the other organs for the distribution of photosynthates. These data support previous findings showing that the position of the sink relative to the source site is one of the main factors determining the amount of photosynthates to be translocated to the sink (7,8).…”

“…A sink organ can be characterized by the "intensity," as expressed by the specific activity of He and "capacity," as expressed by the dry weight (7). At a high density, the sink size was almost equal in the culm and leaf sheath in the tall variety because the culm had a high intensity and the leaf sheath a large capacity (Table 1).…”

The Tomato Crop

“…The inflorescence attracts only a small proportion of assimilates mainly from leaves of two adjacent 'orthostichies' on the same side of the stem (leaves 1, 3, 6 and 8) see Fig. A truss together with the three leaves immediately below it has been regarded as a source-sink unit (Tanaka and Fujita, 1974). When the first three fruiting trusses are growing rapidly, they are the biggest sinks and are supplied by the middle leaves.…”

“…This may be because of the structure of the interveinal connections (Tanaka, Fujita and Shioya, 1974), but thought that the vascular arrangement played little part. Some leaves may supply certain organs preferentially.…”

Characterization of the AGPase large subunit isoforms from tomato indicates that the recombinant L3 subunit is active as a monomer

“…However, in contrast with the strictly heterotrophic amyloplasts, the tomato fruit plastids, at the period of transient starch accumulation in the young green fruit, are functional chloroplasts [47,48] reported to contribute ∼ 15 % to its own metabolite pool [49]. They have also been shown to contain both triose phosphate and hexose-P translocators [50], as well as plastidic FBPase (fructose-1,6-bisphosphatase) activity, thereby permitting starch synthesis from triose phosphate in the plastid [48,[51][52][53].…”