To fuel its rapid growth, the parasite acts as a strong sink for photosynthates
as well as nitrogenous compounds (Jeschke et al.
The latter role is specific to the symbiotic nature of ECMs, in that the fungi associated with the fine roots can sometimes acquire C from the soil through enzymatic breakdown of organic matter as well as from the tree photosynthates
(Courty et al.
With legumes such as bean and soy, the need to allocate photosynthates
to the development of their various organs may be accompanied by a strong demand for nitrogen-fixing Bacteroides in the root nodules.
Weeds that are most competitive with crops usually have a high photosynthetic rate and rapid partitioning of photosynthates
into new leaf production; they have a high light saturation intensity and a low carbon dioxide compensation point (Zimdahl, 1993).
Giant clams, however, are both auto- and heterotrophic, and that despite these lower rates, they achieve large sizes by supplementing suspension feeding by translocation of photosynthates
from symbiotic zooxanthellae (Lucas 1994).
Interactions between roots, microbial communities and the soil, under forest conditions, could involve feedback loops driven by photosynthates
released by roots.
The host grass provides the endophyte fungi with photosynthates
as C and energy sources as well as an isolated shelter to live .
This could have been caused by increased photosynthates
channeled within the seeds as a result of fertilizer application.
Structures such as scalariform perforation plates, which represent considerable expenditure of photosynthates
, are not likely to be present for relictual reasons.
Flooding of the root zone can decrease production of photosynthates
allocated for root and leaf growth thereby decreasing food resources, possibly reducing D.
Mycorrhizae typically aid in water and nutrient uptake in exchange for photosynthates
(Al-Karaki, 1998; Harley and Smith, 1983).
1997) showed that source reduction caused a decrease in the allocation of dry matter to the sheath and stem, and promoted the reserve photosynthates
to be reallocated to grain.