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, the breadth and scale of published research conducted across the many cultivars remains poor. It is unclear whether self-pollination can occur within florets; pollen needs to be moved between florets by pollinators; pollination deficits are widespread

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contradiction, we carried out a study to determine whether cross-pollination deficits exist in the most widespread olive cultivar in Spain by comparing fruit set in response to self-, open-, and cross-pollination (mechanically applied). Pollen dispersal studies

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). This pollination deficit frequently reduces fruit set and yield in olives ( Ayerza and Coates, 2004 ; Navarro-Ainza and López-Carvajal, 2013 ; Sibbett et al., 1992 ). Therefore, to ensure a high yield, orchard designs including pollinizers in the

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) of total national cultivated blueberry production in the United States of America in 2015 ( NASS, 2016 ). Despite the significance of the industry, production is reportedly limited by pollination deficits, particularly in western Washington

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The influence of ectomycorrhizae on drought acclimation was studied in an open-pollinated family of loblolly pine (Pinus taeda L.). Seedlings inoculated with Pisolithus tinctorius (Pers.) Coker and Couch (Pt) maintained a higher shoot relative growth rate under high and low soil moisture regimes. However, fascicle area, shoot and root mass, and fascicle nutrient elemental content were similar for seedlings inoculated with Pt and noninoculated seedlings. Seedlings under low soil moisture were drought-acclimated by five 11-day drought cycles. During peak water deficit (cycle 6), drought-acclimated, Pt-inoculated seedlings had the lowest predawn fascicle water potential (ψ pd), conserved water with lowest bulk fascicle diffusive conductance (g), and maintained low g and transpiration (E) during recovery (cycle 6). Enhanced drought acclimation of Pt-inoculated seedlings was independent of plant size and fascicle nutrient content.

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Abstract

Open-pollinated species, interspecific hybrid seedling populations, and selected clones propagated by softwood cuttings and tissue culture were used to further evaluate the use of dry soil to screen blueberry seedlings for drought resistance. These different propagation types of Vaccinium (subgenus Cyanococcus) were screened for drought resistance in a Galestown fine sandy loam soil. The soil was permitted to dry to progressively higher soil tension levels to a maximum of 0.8 MPa. The plants were evaluated by scoring them on a 1 to 9 shoot damage rating scale and by determining the fraction of total biomass partitioned as roots. Drought resistance in blueberries is heritable and there is a high degree of genetic diversity within and among Vaccinium spp. for resistance to water deficits. Southern species (Vaccinium darrowi Camp, V. elliottii Chapman, and V. ashei Reade) were more drought-resistant than northern species (V. corymbosum L., V. vacillans Torrey, and V. myrtilloides Michaux), which demonstrated the reliability of this soil screening method. Clones with half their germplasm from southern species were usually drought-resistant. This screening method can be used to select for shoot and root vigor and drought resistance in 6- to 7-month-old blueberry seedlings.

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constraint limiting commercial production of annonaceous fruits is low flower to fruit ratio resulting from inadequate pollination ( Gazit et al., 1982 ; Peña et al., 2002 ). Neither self- nor cross-pollination takes place effectively. Self-pollination is

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Water-deficit stress, as well as low-temperature stress, is documented to induce flowering in citrus [ Citrus sp. ( Barbera et al., 1981 , 1985 ; Chica and Albrigo, 2013a , 2013b ; Li et al., 2017 ; Lovatt et al., 1988a , 1988b ; Moss

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). In nut sizing, the nut enlarges and the volume of endosperm increases ( Herrera, 1990 ). Water deficit during nut sizing diminishes the ability of pecan roots to extract soil water and this reduces growth and nut size and increases nut split ( Wells

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–female crosstalk during pollen germination, tube growth and guidance, and double fertilization Mol. Plant 6 4 1018 1036 Garratt, M.P.D. Truslove, C.L. Coston, D.J. Evans, R.L. Moss, E.D. Dodson, C. Potts, S.G. 2013 Pollination deficits in UK apple orchards J

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