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United States Department of Agriculture (USDA) 2004

IMPROVEMENT OF FRUIT SIZE AND YIELD OF MANDARINS IN CALIFORNIA AND GENETIC ANALYSES OF DATE PALMS AND ORNAMENTAL FOLIAGE PLANTS

Mandarins Date Palms

United States Department of Agriculture (USDA) Research, Education & Economics Information System (REEIS)

Titre : IMPROVEMENT OF FRUIT SIZE AND YIELD OF MANDARINS IN CALIFORNIA AND GENETIC ANALYSES OF DATE PALMS AND ORNAMENTAL FOLIAGE PLANTS

Identification : CA-R*-BPS-6687-H

Pays : Etats Unis

Durée : Oct 1, 2004 à Aug 31, 2006

Mots clés : aflp ; genetic markers ; citrus ; cultivars : plant evaluation ; dates ; fruit size ; plant genetics ; mandarin oranges ; hybrids ; ornamental plants ; crop yields ; plant improvement ; gene analysis ; tropical plants ; plant metabolism ; molecular genetics ; pollen ; gene transfer ; orchards ; new varieties ; germplasm ; seedless fruit ; fruit color  ; food flavor ; cross pollination ; fruit set ; application timing ; phenoxy acetic acid ; concentration

Partenaire : UNIVERSITY OF CALIFORNIA RIVERSIDE,CA 92521

Objectifs (1.Determine use of 2,4-D for fruit size and yield increase of mandarins and mandarin hybrids in California ; (2.Determine compatibility among mandarins and pollen transfer within orchards ;(3.To Establish new mandarin cultivar production trials ;(4.Conduct study of date palm germplasm from around the world ;(5.Conduct genetic analyses of ornamental foliage plants. Citrus is one of the major subtropical fruit crops in California. Mandarins and mandarin hybrids are the fastest growing sector of the industry. Consumers and markets prefer easy peeling, nice color, great taste, and seedless mandarins or mandarin hybrids. The increasing importation of mandarins from Spain, Morocco, and other countries encourages our growers to plant more mandarins and remain competitive in the worldwide mandarin market. This trend will continue for years to come in California. Markets also demand seedless mandarins or mandarin hybrids as more fruit come onto the market. The return between seedless fruit versus seedy fruit can be as high as 4-5 times the difference in price. Growers try to plant new mandarin cultivars in isolation, avoid cross-pollination by compatible pollen sources, and produce seedless mandarin fruit. The compatibility/seediness among different mandarins is a great concern and the appropriate safe distance for isolation is also unclear. Some other main problems associated with planting in isolation are low fruit set, low yield, and small fruit size. I have developed an extensive program to enhance fruit set, yield and fruit size of mandarins and mandarin hybrids using plant growth regulators (PGRs) and fertilizers. By identifying the best application timing and concentration of 2,4 dichlorophenoxyacetic acid (2,4-D), I was able to increase the fruit size and yield of mandarins significantly. California citrus growers will benefit directly from this research starting in either 2004 or 2005. An extra 17 to 37 million dollars return could be generated annually based on this research. The issues of compatibility among mandarins and the necessary isolation distance for prevention of cross-pollination is very useful for citrus growers when they establish new orchards. Long term production trials of new mandarins, mandarin hybrids, and sweet oranges will ensure the long term competitiveness and sustainability of the citrus industry in California. The amplified fragment length polymorphism (AFLP) molecular marker is highly polymorphic and repeatable. Using the AFLP markers, I study the germplasm accessions of date palm (Phoenix dactylifera L.) from California, Egypt, Morocco and Oman. My goal is to clarify the genetic relationship of date palm accessions from around the world and eventually determine the origin of date palm. I also use AFLP markers to study accessions of ornamental foliage plants from many genera and establish the genetic relationship within the genera. The studies of date palms and ornamental foliage plants will offer a tool to identify individual accession, establish the genetic relationship among the accessions, and facilitate future germplasm collection, maintenance, and conservation

Présentation : USDA

Page publiée le 10 décembre 2015, mise à jour le 1er novembre 2017