# Trade-Offs and Partitioning Strategy of Carbon Source-Sink During Fruit Development of Camellia oleifera

## TL;DR

This study explores how Camellia oleifera manages carbon sources and sinks during fruit development, highlighting the role of seeds and twigs in carbon allocation.

## Contribution

The study reveals new insights into the dynamic partitioning of non-structural carbohydrates during critical fruit development stages in Camellia oleifera.

## Key findings

- The seed non-structural carbohydrate (NSC) pool peaks during the middle stage of rapid fruit expansion.
- Twigs show significant starch pools and potential roles in carbon transfer to seeds during early and middle fruit development stages.
- Allometric partitioning relationships are observed between twig and seed NSC components during key developmental stages.

## Abstract

Non-structural carbohydrates (NSCs), the main substrates and energy carriers of plants, play an important role in mediating the source-sink balance of carbon (C). However, the trade-offs in the allocation of NSCs remain unclear at critical stages of fruit development. In this study, we evaluated the dynamic and allometric partitioning characteristics of NSCs at the key stage of fruit development in Camellia oleifera. The seed NSCs pool was the highest in the middle stage of rapid fruit expansion, and an inverted “V” shape appeared from July to September and peaked in August. Notably, although the NSC pool of twigs was the smallest and did not change significantly at each stage, the starch pool was the largest. Significant correlations existed between the NSC content of different organs in C. oleifera in the early stage of slow development and the middle stage of rapid fruit expansion. In particular, NSC components, both of the twigs in the early stage and of the twigs and seeds in the middle stage, showed significant allometric partitioning relationships. In summary, seeds are the main carbon sink for fruit development trade-offs of C. oleifera, and twigs may play an important role in transferring C to seeds at the early and middle stages of fruit development. In the future, attention should be paid to controlling the factors affecting the balance of plant C during the rapid fruit expansion period to ensure high yield.