Document Detail

Night temperature and source-sink effects on overall growth, cell number and cell size in bell pepper ovaries.
MedLine Citation:
PMID:  22933415     Owner:  NLM     Status:  Publisher    
Background and AimsOvary swelling, and resultant fruit malformation, in bell pepper flowers is favoured by low night temperature or a high source-sink ratio. However, the interaction between night temperature and source-sink ratio on ovary swelling and the contribution of cell size and cell number to ovary swelling are unknown. The present research examined the interactive effects of night temperature and source-sink ratio on ovary size, cell number and cell size at anthesis in bell pepper flowers.MethodsBell pepper plants were grown in growth chambers at night temperatures of either 20 °C (HNT) or 12 °C (LNT). Within each temperature treatment, plants bore either 0 (non-fruiting) or two developing fruits per plant. Ovary fresh weight, cell size and cell number were measured.Key ResultsOvary fresh weights in non-fruiting plants grown at LNT were the largest, while fresh weights were smallest in plants grown at HNT with fruits. In general, mesocarp cell size in ovaries was largest in non-fruiting plants grown at either LNT or HNT and smallest in fruiting plants at HNT. Mesocarp cell number was greater in non-fruiting plants under LNT than in the rest of the night temperature/fruiting treatments. These responses were more marked in ovaries sampled after 18 d of treatment compared with those sampled after 40 d of treatment.ConclusionsOvary fresh weight of flowers at anthesis increased 65 % in non-fruiting plants grown under LNT compared with fruiting plants grown under HNT. This increase was due primarily to increases in mesocarp cell number and size. These results indicate that the combined effects of LNT and high source-sink ratio on ovary swelling are additive. Furthermore, the combined effects of LNT and low source-sink ratio or HNT and high source-sink ratio can partially overcome the detrimental effects of LNT and high source-sink ratio.
Rebecca L Darnell; Nicacio Cruz-Huerta; Jeffrey G Williamson
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-29
Journal Detail:
Title:  Annals of botany     Volume:  -     ISSN:  1095-8290     ISO Abbreviation:  Ann. Bot.     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372347     Medline TA:  Ann Bot     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Horticultural Sciences Department, University of Florida, Gainesville, FL 32611, USA.
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