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  • Journal of the American Society for Horticultural Science x
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Conventional leafburn evaluations were compared with a new root cell plasmolysis technique to test azalea cultivars (Rhododendron sp.) for salt tolerance. Plasmolysis was a more rapid indicator of salt tolerance than leafburn evaluation, and the technique was an acceptable method of evaluating azalea salt tolerance. Results of this research indicated that the salt-tolerant group contained those species and cultivars considered sun-tolerant, which are characterized by large leaves, coarse stems, and rapid growth. Kurume azaleas were among those determined to be salt-sensitive.

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response to the dehydration (water deficit) stress, it remains very challenging to determine the master elements for the tolerance mechanism. Tomato cultivars are mesophyte plants, generally requiring a more or less continuous water supply. A wild tomato

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-cut shelf life. Variations in fresh-cut quality attributes were assessed among five diverse jalapeño cultivars and 10 intercrosses of these cultivars. Variations in these attributes were evaluated to determine their utility beyond tissue membrane EL for

Open Access

common characteristics of PCD ( Geitmann et al., 2000 ; Roldán et al., 2012 ; Wang et al., 2009a ; Wilkins et al., 2011 ). The Citrus is one of the typical GSI plants, and S-RNase homologues have been cloned from mandarin cultivars, which kept the

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been an increased demand for nuts harvested from grafted cultivars exhibiting improved nut quality traits and spur-bearing habit ( Thomas and Prindle, 2016 ). In contrast to wild sources, nuts derived from improved selections exhibit >30% kernel and

Open Access

turf plants to waterlogging vary with plant species, cultivars, stress duration, and severity ( Huang et al., 1998 ; Jiang and Wang, 2006 ; Liu and Jiang, 2015 ; Wang and Jiang, 2007a , 2007b ; Zong et al., 2015 ). Waterlogging reduced growth

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Five cultivars of apples (Malus domesticus Borkh.) were sampled weekly during the harvest season for 3 consecutive years. The ethylene concentrations in the atmosphere from the apple core cavities were measured using a gas chromatograph. Each cultivar exhibited an individual range of internal ethylene concentration over the harvest season. Depending on the cultivar, the rate of increase in internal ethylene concentration varied from year to year. A single ethylene concentration cannot be used to estimate harvest maturity. Cultivar characteristics of internal ethylene concentrations and their yearly variation are two significant factors in interpreting ethylene measurements used for maturity estimations.

Open Access

Forty olive (Olea europaea L.) cultivars from Valencia, Spain, were screened using random amplified-polymorphic DNA (RAPD) markers. Eighteen selected decamer primers produced 34 reproducible amplification fragments that were then used as polymorphic markers. The resulting combinations of these RAPD markers were used to discriminate 40 cultivars. Results were analyzed for similarity among cultivars and the relatedness of polymorphisms obtained between cultivars agreed with previous results using isozymes. Unweighted pair group method cluster analysis of their similarity values revealed two main groups divided according to geographic origin within Valencia. A third group, which included two Spanish cultivars from regions outside of Valencia, was clustered separately from the Valencian cultivars. RAPD technology proved useful in discriminating closely related cultivars. There was no apparent clustering of cultivars by fruit size or other morphological traits.

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Cephalotaxus Sieb. and Zucc. (plum yew) species and cultivars have become popular because of their sun and shade tolerance, resistance to deer browsing, disease and insect tolerance, and cold and heat adaptability. Unfortunately, the nomenclature and classification in the literature and nursery trade are confusing due to their extreme similarity in morphology. In this study, amplified fragment-length polymorphism (AFLP) markers were used to discriminate taxa and evaluate genetic differences among 90 Cephalotaxus accessions. A total of 403 useful markers between 75 and 500 base pairs (bps) was generated from three primer-pair combinations. Cluster analysis showed that the 90 accessions can be classified as four species, C. oliveri Mast., C. fortunei Hooker, C. harringtonia (Forbes) Koch., and C. ×sinensis (a hybrid species); four varieties, C. fortunei var. alpina Li, C. harringtonia var. koreana (Nakai) Rehd., C. harringtonia var. nana (Nakai) Hornibr., and C. harringtonia var. wilsoniana (Hayata) Kitamura; and eight cultivars. Suggested names are provided for mislabeled or misidentified taxa. The Cephalotaxus AFLP data serve as a guide to researchers and growers for identification and genetic differences of a taxon, and a model to establish a cultivar library against which later introductions or problematic collections can be cross-referenced.

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cultivars from different parts of the world since 2009. One of our primary goals is the selection and cultivation of adaptive varieties for the subtropical area of the Chinese ornamental plants market. Before this present study, we previously tested on high

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