한국잡초학회지 (Korean Journal of Weed Science)
- 제17권4호
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- Pages.345-361
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- 1997
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- 0253-7648(pISSN)
광합성산물의 아포플라스트 체관부적재 기작
Apoplastic Phloem Loading of Photoassimilate
- Kim, Song-Mun (Kangwon National University) ;
- Hur, Jang-Hyun (Kangwon National University) ;
- Han, Dae-Sung (Kangwon National University)
- 투고 : 1997.09.03
- 발행 : 1997.12.30
초록
Photoassimilates translocate from regions of carbohydrate synthensis(source) to regions of carbohydrate utilization or storage(sink). In the source, assimilate loads into the phloem for long-distance transport. Current evidence suggests that there are twig loading mechanisms : one involves assimilate transfer via the apoplasm and then load into the phloem by carrier-mediated proton-sucrose cotransport, while the other involves movement through the continuous symplastic connections between the mesophyll cells and the phloem. Inspite of problems associated with the interpretation of experiments, the evidence for apoplastic loading remains convincing because the apoplastic loading systems explains well the observed accumulation capacity arid the selectivity of assimilate uptake by tile phloem.