Abstract
The distribution of carbon from a branch setting pod in alfalfa was investigated during the seed development of seeds to determine the relative contribution of pod and leaf photoassimilates to the total C balance and to investigate the partitioning of these photoassimilates to other plant organs. A 13Clabeling procedure was used to label C photoassimilates of pods and leaves in alfalfa, and the Δ13C values of a pod, leaves, a section of stem and roots were measured during seed development on day 10, 15, 20 and 25 after labeling of the pod. The results showed that the alfalfa pod had photosynthetic capacity early in the development of seeds, and that pod photosynthesis could provide carbon to alfalfa organs including seeds, pods, leaves, stems and roots, in addition to leaf photosynthesis. Photosynthesis in the pod affected the total C balance of the alfalfa branch with the redistribution of a portion of pod assimilates to other plant organs. The assimilated 13C of the pod was used for the growth requirements of plant seeds and pods. The requirements for assimilated C came primarily from the young pod in early seed development, with later requirements provided primarily from the leaf.
Highlights
The distribution of carbon from a branch setting pod in alfalfa was investigated during the seed development of seeds to determine the relative contribution of pod and leaf photoassimilates to the total C balance and to investigate the partitioning of these photoassimilates to other plant organs
Does the pod in alfalfa have photosynthetic capacity, and does pod photosynthesis contribute to seed production in alfalfa? These questions remain unanswered because pod photosynthesis in alfalfa has not been investigated
In some studies, labeling with 13C/12C is used in the characterization of assimilated C and the further partitioning into different organs[14,15]. This experiment was designed to investigate the changes in 13CO2 assimilation in both pods and leaves during the stages of seed development in alfalfa, and the following questions were addressed: (i) Did the alfalfa pod have photosynthetic capacity? (ii) What were the contributions during the growth of the pod and leaves to the total C balance? and (iii) How was the partitioning of 13C assimilated by the pod and leaves affected by the growth requirements of seeds
Summary
The distribution of carbon from a branch setting pod in alfalfa was investigated during the seed development of seeds to determine the relative contribution of pod and leaf photoassimilates to the total C balance and to investigate the partitioning of these photoassimilates to other plant organs. The results showed that the alfalfa pod had photosynthetic capacity early in the development of seeds, and that pod photosynthesis could provide carbon to alfalfa organs including seeds, pods, leaves, stems and roots, in addition to leaf photosynthesis. In some studies, labeling with 13C/12C is used in the characterization of assimilated C and the further partitioning into different organs[14,15] This experiment was designed to investigate the changes in 13CO2 assimilation in both pods and leaves during the stages of seed development in alfalfa, and the following questions were addressed: (i) Did the alfalfa pod have photosynthetic capacity? This experiment was designed to investigate the changes in 13CO2 assimilation in both pods and leaves during the stages of seed development in alfalfa, and the following questions were addressed: (i) Did the alfalfa pod have photosynthetic capacity? (ii) What were the contributions during the growth of the pod and leaves to the total C balance? and (iii) How was the partitioning of 13C assimilated by the pod and leaves affected by the growth requirements of seeds
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