Document Detail

Changes in vascular and transpiration flows affect the seasonal and daily growth of kiwifruit (Actinidia deliciosa) berry.
MedLine Citation:
PMID:  20382641     Owner:  NLM     Status:  MEDLINE    
BACKGROUND AND AIMS: The kiwifruit berry is characterized by an early stage of rapid growth, followed by a relatively long stage of slow increase in size. Vascular and transpiration flows are the main processes through which water and carbon enter/exit the fruit, determining the daily and seasonal changes in fruit size. This work investigates the biophysical mechanisms underpinning the change in fruit growth rate during the season.
METHODS: The daily patterns of phloem, xylem and transpiration in/outflows have been determined at several stages of kiwifruit development, during two seasons. The different flows were quantified by comparing the diurnal patterns of diameter change of fruit, which were then girdled and subsequently detached while measurements continued. The diurnal courses of leaf and stem water potential and of fruit pressure potential were also monitored at different times during the season.
KEY RESULTS: Xylem and transpiration flows were high during the first period of rapid volume growth and sharply decreased with fruit development. Specific phloem import was lower and gradually decreased during the season, whereas it remained constant at whole-fruit level, in accordance with fruit dry matter gain. On a daily basis, transpiration always responded to vapour pressure deficit and contributed to the daily reduction of fruit hydrostatic pressure. Xylem flow was positively related to stem-to-fruit pressure potential gradient during the first but not the last part of the season, when xylem conductivity appeared to be reduced.
CONCLUSIONS: The fruit growth model adopted by this species changes during the season due to anatomical modifications in the fruit features.
Brunella Morandi; Luigi Manfrini; Pasquale Losciale; Marco Zibordi; Luca Corelli Grappadelli
Publication Detail:
Type:  Journal Article     Date:  2010-04-09
Journal Detail:
Title:  Annals of botany     Volume:  105     ISSN:  1095-8290     ISO Abbreviation:  Ann. Bot.     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-05-26     Completed Date:  2010-09-15     Revised Date:  2013-05-29    
Medline Journal Info:
Nlm Unique ID:  0372347     Medline TA:  Ann Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  913-23     Citation Subset:  IM    
Dipartimento Colture Arboree, University of Bologna, Viale Fanin 46, Bologna, Italy.
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MeSH Terms
Actinidia / growth & development*,  physiology
Biological Transport / physiology
Fruit / growth & development*
Growth / physiology*
Phloem / physiology
Plant Leaves / physiology
Plant Shoots / growth & development*,  physiology
Plant Stems / physiology
Plant Transpiration / physiology*
Water / physiology
Xylem / physiology*
Reg. No./Substance:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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