Search Results

You are looking at 31 - 40 of 71 items for :

  • " Prunus salicina " x
  • HortScience x
Clear All

Twenty-nine commercial and experimental Prunus rootstocks, most with incorporated root-knot nematode [Meloidogyne javanica (Traub.) Chitwood] resistance, were evaluated against mixtures comprising nine populations of the root-lesion nematode Pratylenchus vulnus Allen and Jensen. Nearly all tested materials were susceptible. Five cultivars with high resistant levels were further challenged with seven P. vulnus populations individually. `Redglow' (Prunus salicina Lindl. × P. munsoniana Wight and Hedrick) was the only rootstock that showed broad resistance to all populations. The rootstocks `Torinel' (P. domestica L.), AC-595 (P. domestica × P. insititia L.), `Marianna 4001' (P. cerasifera Ehr. × P. munsoniana), and `Felinem' [P. dulcis (Mill.) D. A. Webb × P. persica (L.) Batsch] showed resistance to one or a few P. vulnus populations. Several supposedly resistant sources proved to be susceptible. Tests of crosses made between parents of diverse genetic background with partial resistance to P. vulnus indicate that a descendant with potential P. vulnus resistance is difficult to obtain. Pathogenic diversity among P. vulnus populations appears to be high.

Free access

Japanese plum (Prunus salicina Lindel., `Casselman') trees were enclosed in open-top chambers on 1 May 1989 and exposed to three atmospheric ozone partial pressures (charcoal-filtered air [CF], ambient air [AA], and ambient air+ozone [AO]) during the growing season in 1989, 1990, 1991, and 1992. The mean 12-h (0800-1900 HR PDT) ozone partial pressures during 1992 were 0.027, 0.045, and 0.087 μPa Pa-1 in the CF, AA, and AO treatments, respectively. Both stem and leaf water potential (Ψ) decreased from 0700 to 1600 HR PDT and were lowest at midday (1200-1400 HR PDT) in all ozone treatments. Leaf and stem were equivalent at predawn, but leaf Ψ was lower than stem Ψ during the diurnal period. Midday stem Ψ was greater in the AA and AO treatments compared to the CF treatment. Before 1 Aug., stomatal conductance of trees in the AO treatment was reduced compared to the CF treatment, but diurnal fluctuations were similar between the two treatments. Following 1 Aug., stomatal conductance of trees in the AO treatment was reduced compared to the CF treatment, but stomatal conductance of the AO treatment remained the same throughout the day. Trees in the AO treatment had greater leaf fall earlier in the growing season than those of the other treatments. Changes in plum tree stem Ψ under chronic ozone stress are probably due to a loss (early senescence) of transpiring leaf area as well as declines in stomatal conductance.

Free access

The annual yield variation in a Japanese plum (Prunus salicina Lindl.) germplasm collection [with 32 cultivars (cv)] was used to generate regression models to describe fruit yields in terms of climate. A Geographic Information System (GIS) combined with generated regression models was used for a regional analysis of potential areas for growing plums in Zacatecas, Mexico. Three distinct cv groups were obtained by principal component analysis and were included in the study: a) `Frontier'–`Santa Rosa', b) `Ozark Premier'–`Burbank', and c) `Shiro'. The amount of winter chilling and temperatures during bloom time were the climatic conditions most related to yield. `Frontier'–'Santa Rosa' had relatively low chilling requirements (700 chill units) compared to `Ozark Premier'–`Burbank', which required the most chilling (900 chill units). `Shiro' yields were more consistent than those of the other two groups, suggesting that it has less strict requirements and received sufficient chilling every year. High temperatures at bloom reduced fruit yield in all cultivars; however, the dependence of yield on temperatures during bloom in `Shiro' was modified by summer temperatures the previous year, suggesting that temperatures at the floral induction and formation stages affect flower primordia development. Using GIS, three potential areas for growing plums in the region were defined on maps, and the differences in potential yield between the cultivar groups were determined. `Frontier'–`Santa Rosa' may be good choices as plum cultivars for the region because they were the cultivars with the highest potential yield in the largest area; however, the flexibility of the method used allows the user to get a regional gradient of the expected yields with several plum cultivars. Using experimental information and a GIS can extend the applicability of germplasm collection data to regional planning in the establishment of orchards and new fruit industries.

Free access

Most Asian plum ( Prunus salicina Lindl.) cultivars have a self-incompatible mechanism that prevents self-fertilization ( Okie and Hancock, 2008 ). In fact, most rosaceous fruit tree species, including P. salicina , exhibit gametophytic self

Free access
Author:

cultivars examined in the present study have smaller pollen grains than peach, European plums, apple, and Japanese plums ( Prunus salicina Lindl.) ( Fogle, 1977a , 1977b ). The equatorial length of the pollen grains was generally much greater than the

Free access

, regarding the origin of European plums, Eryomine (1991) stated that it is originated of mixed descent from many other species, including Prunus microcarpa , Prunus salicina , Prunus armeniaca , and Prunus persica . The term Japanese plum was applied

Free access

also responsible for the occurrence of vitrification (a phenomenon of plantlets appearing turgid, glaucous, and watery), which has been shown on Prunus salicina within pH 5.4 to 5.8 ( Ding et al., 2008 ). In the case of apple, the medium pH regulated

Free access

coating on quality and antioxidant properties in sweet cherry during postharvest storage Ital. J. Food Sci. 27 173 180 Crisosto, C.H. Garner, D. Crisosto, G.M. Bowerman, E. 2004 Increasing ‘Blackamber’ plum ( Prunus salicina Lindell.) consumer acceptance

Free access

‘Summer Fantasia’, a new Japanese plum ( Prunus salicina Lindl.), originated from a cross between ‘Soldam’ and ‘Taiyo’ made in 1999 at the National Institute of Horticultural & Herbal Science (NIHHS) of the Rural Development Administration (RDA) in

Free access
Author:

‘Replantpac’ is a new plum–almond hybrid selected by Agromillora Iberia, S.L., Barcelona, Spain, for use mainly as a rootstock for Japanese plum ( Prunus salicina Lindl.), peach, and nectarine [ P. persica (L.) Batsch] cultivars, but it can also

Free access