As you want the syllabus of Fruit Science -horticulture of Agricultural Research Service (ARS) National Eligibility Test NET exam so here I am providing you.

ARS NET exam Fruit Science horticulture syllabus

Unit 1. TROPICAL AND DRY LAND FRUIT PRODUCTION

Commercial varieties of regional, national and international importance,
ecophysiological requirements, recent trends in propagation, rootstock influence,
planting systems, cropping systems, root zone and canopy management, nutrient
management, water management, fertigation, role of bioregulators, abiotic factors
limiting fruit production, physiology of flowering, pollination fruit set and
development, honeybees in cross pollination, physiological disorders- causes and
remedies, quality improvement by management practices; maturity indices,
harvesting, grading, packing, storage and ripening techniques; industrial and export
potential, Agri. Export Zones(AEZ) and industrial supports.
Crops: Mango and Banana, Citrus and Papaya, Guava, Sapota and Jackfruit,
Pineapple, Annonas and Avocado, Aonla, Pomegranate and Ber, minor fruits of
tropics.

Unit 2. SUBTROPICAL AND TEMPERATE FRUIT PRODUCTION

Commercial varieties of regional, national and international importance,
ecophysiological requirements, recent trends in propagation, rootstock influence,
planting systems, cropping systems, root zone and canopy management, nutrient
management, water management, fertigation, bioregulation, abiotic factors limiting
fruit production, physiology of flowering, fruit set and development, abiotic factors
limiting production, physiological disorders-causes and remedies, quality
improvement by management practices; maturity indices, harvesting, grading,
packing, precooling, storage, transportation and ripening techniques; industrial and
export potential, Agri Export Zones(AEZ) and industrial support. Crops: Apple, pear,
quince, grapes, Plums, peach, apricot, cherries, Litchi, loquat, persimmon, kiwifruit,
strawberry, Nuts- walnut, almond, pistachio, pecan, hazelnut, Minor fruits- mangosteen, carambola, bael, wood apple, fig, jamun, rambutan, pomegranate.

Unit 3. BIODIVERSITY AND CONSERVATION

Biodiversity and conservation; issues and goals, centers of origin of cultivated fruits;
primary and secondary centers of genetic diversity; Present status of gene centers;
exploration and collection of germplasm; conservation of genetic resources –
conservation in situ and ex situ. Germplasm conservation- problem of recalcitrancy -
cold storage of scions, tissue culture, cryopreservation, pollen and seed storage;
inventory of germplasm, introduction of germplasm, plant quarantine; Intellectual
property rights, regulatory horticulture. Detection of genetic constitution of
germplasm and maintenance of core group; GIS and documentation of local
biodiversity, Geographical indication.
Crops: Mango, sapota, citrus, guava, banana, papaya, grapes, jackfruit, custard,
apple, ber, aonla, malus, Prunus sp, litchi, nuts, coffee, tea, rubber, cashew, coconut,
cocoa, palmyrah, arecanut, oil palm and betelvine.

Unit 4. CANOPY MANAGEMENT IN FRUIT CROPS

Canopy management - importance and advantages; factors affecting canopy
development; Canopy types and structures with special emphasis on geometry of
planting, canopy manipulation for optimum utilization of light. Light interception and
distribution in different types of tree canopies; Spacing and utilization of land area -
Canopy classification; Canopy management through rootstock and scion; Canopy
management through plant growth inhibitors, training and pruning and management
practices; Canopy development and management in relation to growth, flowering,
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fruiting and fruit quality in temperate fruits, grapes, passion fruits, mango, sapota,
guava, citrus and ber.

Unit 5. BREEDING OF FRUIT CROPS

Origin and distribution, taxonomical status – species and cultivars, cytogenetics,
genetic resources, blossom biology, breeding systems, breeding objectives, ideotypes,
approaches for crop improvement – introduction, selection, hybridization, mutation
breeding, polyploid breeding, rootstock breeding, improvement of quality traits,
resistance breeding for biotic and abiotic stresses, biotechnological interventions,
achievements and future thrust in the following selected fruit crops.
Crops: Mango, banana and pineapple, Citrus, grapes, guava and sapota, Jackfruit,
papaya, custard apple, aonla, avocado and ber,Mangosteen, litchi, jamun, phalsa,
mulberry, raspberry, kokam and nuts,Apple, pear, plums, peach, apricot, cherries
and strawberry.

Unit 6. POST HARVEST TECHNOLOGY

Maturity indices, harvesting practices for specific market requirements, influence of
pre-harvest practices, enzymatic and textural changes, respiration, transpiration;
Physiology and biochemistry of fruit ripening, ethylene evolution and ethylene
management, factors leading to post-harvest loss, pre-cooling; Treatments prior to
shipment, viz., chlorination, waxing, chemicals, biocontrol agents and natural plant
products. Methods of storage- ventilated, refrigerated, MAS, CA storage, physical
injuries and disorders; Packing methods and transport, principles and methods of
preservation, food processing, canning, fruit juices, beverages, pickles, jam, jellies,
candies; Dried and dehydrated products, nutritionally enriched products, fermented
fruit beverages, packaging technology, processing waste management, food safety
standards.

Unit 7. GROWTH AND DEVELOPMENT

Growth and development- definition, parameters of growth and development, growth
dynamics, morphogenesis; Annual, semi-perennial and perennial horticultural crops,
environmental impact on growth and development, effect of light, photosynthesis and
photoperiodism vernalisation, effect of temperature, heat units, thermoperiodism;
Assimilate partitioning during growth and development, influence of water and
mineral nutrition during growth and development, biosynthesis of auxins,
gibberellins, cytokinins, abscissic acid, ethylene, brasssinosteroids, growth inhibitors,
morphactins, role of plant growth promoters and inhibitors; Developmental
physiology and biochemistry during dormancy, bud break, juvenility, vegetative to
reproductive interphase, flowering, pollination, fertilization and fruit set, fruit drop,
fruit growth, ripening and seed development; Growth and developmental process
during stress - manipulation of growth and development, impact of pruning and
training, chemical manipulations in horticultural crops, molecular and genetic
approaches in plant growth development.

Unit 8. BIOTECHNOLOGY OF FRUIT CROPS

Harnessing bio-technology in horticultural crops, influence of plant materials,
physical, chemical factors and growth regulators on growth and development of plant
cell, tissue and organ culture; Callus culture - types, cell division, differentiation,
morphogenesis, organogenesis, embryogenesis; Use of bioreactors and in vitro
methods for production of secondary metabolites, suspension culture, nutrition of
tissues and cells, regeneration of tissues, ex vitro, establishment of tissue cultured
plants; Physiology of hardening - hardening and field transfer, organ culture –
meristem, embryo, anther, ovule culture, embryo rescue, somaclonal variation,
protoplast culture and fusion; Construction and identification of somatic hybrids and
cybrids, wide hybridization, in vitro pollination and fertilization, haploids, in vitro
mutation, artificial seeds, cryopreservation, rapid clonal propagation, genetic
engineering and transformation in horticulture crops, use of molecular markers. In
vitro selection for biotic and abiotic stress, achievements of biotechnology in
horticultural crops.

Unit 9. PROTECTED FRUIT CULTURE

Greenhouse – World scenario, Indian situation: present and future, Different agroclimatic
zones in India, Environmental factors and their effects on plant growth;
Basics of greenhouse design, different types of structures – glasshouse, shade net,
poly tunnels - Design and development of low cost greenhouse structures; Interaction
of light, temperature, humidity, CO2, water on crop regulation - Greenhouse heating,
cooling, ventilation and shading; Types of ventilation- Forced cooling techniques -
Glazing materials - Micro irrigation and Fertigation; Automated greenhouses,
microcontrollers, waste water recycling, Management of pest and diseases – IPM.