.131.41 Puchooa, D 2005 In vitro mutation breeding of Anthurium by gamma radiation Intl. J. Agr. Biol. 7 11 20 Raghuvanshi, S.S. Singh, A.K. 1979 Gamma-ray induced mutations in diploid and autotetraploid perennial Portulaca grandiflora Hook
seven tetraploids (‘Gold’, ‘Pink Caprice’, ‘Radiation’, and UPL) showed such tendency. To find more tetraploids that do not produce UFGs and can be used as breeding parents, screening of more commercial cultivars or germplasm and progeny through ploidy
, haploidization offers a great advantage by shortening the breeding cycle. Haploid plants can be obtained using various tissue culture techniques and full homozygosity can be achieved in quite a short time using these methods. Since the heterozygosity rate is high
yield difference could be determined by many factors, including climate, greenhouse light transmissivity, and equipment, a crucial factor in the Netherlands is breeding for high yield. The yield of Dutch cultivars by year of release increased by ≈0
). Here, we have investigated whether there is genotypic variation in frost tolerance of open highbush blueberry flowers that could be exploited in breeding highbush cultivars that are more tolerant to late winter/early spring frosts. Frost tolerance of
as a cut flower and potted plants and has become an important crop for breeding new varieties with novel or improved traits as a result of its high economic value as a tropical ornamental ( Prathepha, 2000 ). One method for obtaining new cultivars of
in breeding programs for developing new cultivars with chilling tolerance ( Henny and Chen, 2004 ). Dieffenbachia , commonly known as dumb cane, is a member of the family Araceae and ranks among the top five most popular foliage plant genera
Abstract
Four cultivars and several breeding lines of storage cabbage were grown by direct seeding and by transplanting over 2 seasons. Weights and densities of heads harvested at successive intervals in conjunction with heat units and available solar radiation yielded estimates of the time to maturity and the mature time interval in the field before splitting is likely to occur. Most cultivars of storage cabbage are ready for harvest when they have attained a density of 0.72–0.80 and a weight of 2.2–3.0 kg which corresponds to accumulation of 1000 to 1050 C heat units (10°C base) and 50,000 to 5000 gm/cal/cm2 solar radiation units. The interval between maturity and splitting varied from less than 1 week to more than 6 weeks depending upon cultivar and weather conditions.
44 ORAL SESSION 7 (Abstr. 423–429) Breeding & Genetics–Floriculture/Foliage
Four chrysanthemum (Dendranthema grandiflora) spontaneous and radiation-induced sports from the cultivar `Charm' and phenotypically differing only in flower color were individually characterized using arbitrary signatures from amplification profiles (ASAP). ASAP analysis is based on a two-step arbitrary primer amplification procedure that produces “fingerprints of fingerprints.” In the first step, `Charm', `Dark Charm', `Dark Bronze Charm', `Salmon Charm', and `Coral Charm' were fingerprinted by DNA amplification fingerprinting (DAF) with standard octamer arbitrary primers. Diluted products from three monomorphic fingerprints for each cultivar were subsequently reamplified using four minihairpin decamer primers. Each of the 12 ASAP profiles revealed about 30% polymorphic loci and some were used to uniquely identify cultivars and estimate genetic relationships. The ASAP technique permits identification of previously genetically indistinguishable plant material and should facilitate marker assisted breeding and protection of ownership rights.