| Abstract Detail
Pepper - Afternoon Paran, Ilan [1], Ben Chaim, Arnon [2], Borovsky, Yelena [1], Falise, Matthew [2], Mazourek, Michael [2], Kang, Byoung-Cheorl [2], Harpaz, Tamar [1], Jahn, Molly [2]. Genetic control of quantitative variation of capsaicinoid content in Capsicum. PUNGENCY or “heat” found in Capsicum fruit results from the biosynthesis and accumulation of capsaicinoids in the placental tissue surrounding the seeds. Pungent pepper cultivars differ with respect to their level of pungency because of quantitative variation in capsaicinoid content. We analyzed capsaicinoids content in an interspecific cross between C. annuum ‘NuMex RNaky’ (low pungency) and the wild highly pungent C. frutescens accession BG2814-6. F3 families were analyzed in three locations in California and in Israel and a dense molecular map was constructed comprised mostly of simple sequence repeat (SSR) markers. Six QTLs controlling capsaicinoid content were detected on three chromosomes. In addition, two QTLs controlling fruit weight were detected, however, they did not co-localize with QTLs detected for capsaicinoid content. The major contribution to the phenotypic variation of capsaicinoid content (24-42% of the total variation) was attributed to a digenic interaction between a main-effect QTL, cap7.1, and a marker in chromosome 2 that did not have a main effect on the trait. A second QTL, cap7.2 is likely to correspond to the QTL, cap, previously identified as the major capsaicinoid content QTL in pepper. cap was also identified in an additional C. annuum cross between the non-pungent cultivar Maor and the pungent accession Perennial. Our results reinforce the importance of cap as a major capsaicinoid content QTL across the Capsicum genus.
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1 - Agricultural Research Organization, Plant Genetics and Breeding, The Volcani Center, Bet Dagan, 50250, Israel
2 - Cornell University, Plant Breeding, Ithaca, NY, 14853, USA
Keywords:
Pepper
Pungency.
Session: SAT08-7
Location: Hall of Ideas Room H/Monona Terrace
Date: Wednesday, July 26th, 2006
Time: 4:00 PM
Abstract ID:73 |
