Daucus carota var. atrorubens Egypt

Traits evaluated: ANTHER COLOR (ANTHERCOL); BRACT LENGTH (BRACTLEN); NUMBER OF BRACT POINTS (BRACTPNTS); BRACT WIDTH (BRACTWID); BRACT LOBE PAIRS (BRCTLOBPAR); FLOWER RAY NUMBER (FLWRAYNUM); FOLIAGE COLOR (FOLIAGECOL); INVOLUCRAL BRACT POSITION (INVOLBRACT); LEAF PUBESCENCE (LEAFPUBE); LEAF TYPE (LEAFTYPE); MATURE LEAF LENGTH (MATLEAFLEN); MATURE LEAF WIDTH (MATLEAFWID); MATURE PETIOLE LENGTH (MATPETLENG); MATURE PETIOLE THICKNESS (MATPETTHK); PIGMENTED CENTRAL UMBEL COLOR (PCUCOLOR); PIGMENTED CENTRAL UMBEL (PCUPRESENT); PEDUNCLE PUBESCENCE (PEDUNCPUB); PETAL COLOR (PETALCOLOR); PETIOLE HAIRINESS (PETIOLHAIR); PETIOLE SHAPE (PETIOLSHP); PETAL LENGTH CENTRAL (PETLENCEN); PETAL LENGTH PERIPHERAL (PETLENPER); PLANT HEIGHT (PLANTHEIGH); PRIMARY UMBEL FLOWER HEIGHT (PRIMFLWHT); PRIMARY UMBEL DIAMETER (PRIMUMDIAM); SECONDARY UMBEL DIAMETER (SECUMBDIAM); SEED LENGTH (SEEDLENGTH); SEED WIDTH (SEEDWIDTH); SPINE CURVATURE (SPINECURV); HAIRS AT BASE OF PRIMARY SPINE (SPINEHAIRS); WIDTH SEC RIB SPINE CONFLUENCE (SPNCNFLWDT); SPINE CONFLUENCY (SPNCONFLU); LENGTH OF SECONDARY RIB SPINES (SPNSECLENG); NO. OF SPINES ON SECONDARY RIB (SPNSECRBNO); BARBS AT TIPS OF SPINES (SPNTIPBARB); STAMEN LENGTH (STAMENLENG); STEM DIAMETER (STEMDIAM); STIPULE WIDTH (STIPULWIDT); UMBEL SHAPE - FULL BLOOM (UMBELSHPFB); UMBEL SHAPE - MATURE SEED (UMBELSHPMT)

Evaluation location: Iowa, United States. Method: Daucus descriptor data recorded from observation planting Field N-3 at the NCRPIS farm (42 degrees 3 minutes N latitude 93 degrees 30 minutes W longitude).

Strandberg, J.O. 1992. Evaluations of plant introductions of Daucus species for tolerance of Alternaria Dauci and some other horticultural characteristics. University of Florida Central Florida Research and Education Center. Sanford, Florida. Research Report SAN 93-03

Accessions were planted in a randomized complete block design with two replications at the Hancock Research Station in Hancock, WI, in the summer of 2016 and 2017. One hundred seeds of each accession were planted in each 1-m plots. Canopy height was measured just before harvest with three measurements taken per plot. Harsh flavor was evaluated on a scale of 1 to 5 (with 5 being the least harsh, and 1 being the harshest) on at least three individual roots per plot after harvest in fall 2016.

The objectives of this study were to evaluate the response of diverse carrot germplasm to heat stress, identify heat-tolerant germplasm that may be used by plant breeders, and define the appropriate temperature for assessing heat tolerance in germinating carrot seed.