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- Author or Editor: P. Spiegel-Roy x
Abstract
In a breeding program for table grapes (Vitis vinifera L.) initiated in 1968 at Bet Dagan, Israel, one objective has been to breed large-berried, better-flavored grape cultivars for replacement of ‘Ribier’ (syn. Alphonse Lavallee). A selection with large black berries has been made and named ‘Nava’ (Fig. 1.). The fruit is well-adapted for the fresh market.
Grapevine (Vitis vinifera L.) explant shoots indexed forcorky-bark and rootstocks from healthy LN33 indicator plants were sterilized and maintained in vitro. When infected shoot tips were micrografted onto LN33 shoots, typical corky-bark symptoms appeared in 8 to 12 weeks. We suggest developing this method further to replace the regular, 2-year indexing procedure.
Abstract
‘Samish’ is a high-yielding, semi-hard-shelled, well-sealed, highly flavored cultivar of almond (Prunus amygdalus Batsch), with fairly uniform kernels.
Abstract
A major objective of the grape-breeding program, started in 1968 at Bet Dagan, has been to breed early-ripening and late-ripening table grapes with loose clusters, and good berry size, appearance and quality. Only crosses between Vitis vinifera cultivars have been made. The progeny of a local ‘Dabouki’ × ‘Cardinal’ cross have proven of particular interest and one selection is being named ‘Shani’.
Abstract
In a breeding program for table grapes (Vitis vinifera L.) initiated in 1968 at Bet Dagan, one of the objectives has been to breed late-ripening cultivars. A late-ripening selection from a cross between ‘Dabouki’ and ‘Cal-meria’ has been made and is being named ‘Elul’.
Abstract
In a breeding program for table grapes initiated in 1968 at Bet Dagan, one of the objectives has been to breed late-ripening cultivars of Vitis vinifera. A late-ripening plant selected from a cross of ‘Zeni’ and ‘Toufahi’, made in 1969, is being named ‘Odem’.
Abstract
Staminate clone Israel 502 and ‘Kerman’ and ‘Lassen’ pistachio (Pistacia vera L.) on two rootstocks showed remarkable drought resistance under runoff farming in the Negev desert highlands. During favorable seasons, root distribution was fairly uniform down to 240 cm. Moisture depletion fluctuated between 58 and 477 mm during 1971-1974 because of great differences in flood water availability and scant annual rainfall (54–163 mm). Soil moisture was depleted in all strata well below the wilting point throughout the growing season in 1973 and from mid-July in 1974. Shoot growth terminated within 4–5 weeks. Although trunk growth continued at an even rate until August 1–15, the relative increment was 4.2–7% higher with the staminate clone. Extreme drought from the autumn of 1972 through 1973 (58 mm water depletion) did not prevent bud differentiation and high yields per tree (12.0 kg for ‘Kerman’, 9.5 kg for ‘Lassen’) in 1974.
Abstract
Soil moisture use, shoot growth, fruit size, and yield of apricot (Prunus armeniaca) trees (cv. Hatif de Colomer) were measured under flood water-spreading conditions in the desert. Root distribution was estimated from interpretation of soil moisture data. A highly significant correlation was found between pooled values of past and current seasons' water depletion values and current season's yield. Relative maximum water depletion (on a daily use basis) occurred during fruit maturation. Maximum trunk growth occurred in spring. In some seasons a second, small peak occurred in the autumn.
Shoot growth usually terminated by the beginning of June, and maximum trunk rate growth was usually (except in 1967) attained shortly thereafter.
Trees survived the extremely dry 1968 season (no flood, and only 80 mm of rain), with partial recovery in shoot growth and yield and full recovery in trunk growth during the subsequent year.
Moisture depletion under the trees, per 1000 m2, during the active period of the trees (March to end of September) was only 26 mm in 1968, about 100 mm in 1966, 106 mm in 1967 and 146 mm in 1969. Yields per tree (26 trees per 1000 m2) ranged from 1.4 kg (in 1970) to 27.4 kg (in 1967).
The central cylinder around the tree (2 meters in diam) accounted for the highest relative use of water in comparison with other annuli extending around the tree.
Abstract
In a table grape-breeding program initiated in 1968 at Bet Dagan, the progeny of a cross between the local cultivar ‘Dabouki’ and ‘Cardinal’, has proven of special interest and several selections have been made. One selection is being named ‘Sivan’.
Abstract
Nucellar and zygotic offspring of ‘Satsuma’ mandarin (Citrus reticulata Blanco) were differentiated by gas chromatographic analysis of gaseous emanations from fragmented leaves of 6-month-old seedlings. Analysis was rapid (< 3 minutes/sample), could be performed on individual leaves, and required virtually no tissue processing. Thus, the method is amenable to the screening of large progeny at the young seedling stage.