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Edible coatings are used to maintain overall quality and extend the shelf-life of fruit after harvest. The objective of this research was to evaluate the effect of edible coatings based on beeswax and shellac on the postharvest quality of fresh chayote [Sechium edule (Jacq.) Sw. var. virens levis] stored for 0, 8, 16, 24, and 32 days at 7 °C. The experiment was conducted with a completely randomized design with mixed effects and three replicates. Physicochemical analyses were carried out for color, texture, acidity, pH, weight loss, and CO2 concentration. The applied coatings stabilized the physicochemical properties and reduced the weight loss percentage (1.8 to 3.4 %) of the chayotes during the storage period without creating an adverse effect compared to the control (4.1 %). The most effective coating (treatment 6) had the highest concentration of beeswax and the lowest concentration of shellac, forming an effective barrier against gases and water vapor. [ABSTRACT FROM AUTHOR]

Tomato (Solanum lycopersicum L.) is a glycophyte species with medium sensitivity to salts, tolerating electrical conductivity values in the soil solution of up to 2.5 dS m-1. Silicon (Si) is a beneficial element that can act as an inorganic biostimulant in plants subjected to salinity. In this research, the main effects of two study factors were evaluated: a) salinity by NaCl (0, 50, and 100 mM) in the nutrient solution and b) biostimulation by Si, applied to the leaves (0, 75, and 150 mg L-1), as well as the interaction of both factors on yield and quality in fruits of the second cluster of tomato plants cv. Río Supremo grown hydroponically under greenhouse conditions. Yield was significantly reduced in the saline treatments, and was not affected by the application of silicon. Compared with the control, the NaCl concentrations evaluated reduced the fruit pH value by 6.2 %, but increased titratable acidity (TA) by 64.8 %, electrical conductivity (EC) by 72.9 %, and total soluble solids (TSS) by 80 %. Consequently, the NaCl treatments increased the TSS/TA ratio, compared to the control. The application of 75 mg Si L-1 through the leaves reduced the pH of the fruit by 0.6 %, while the dose of 150 mg Si L-1 increased the EC and the TSS/TA ratio in fruits. In plants treated with 50 mM NaCl and with both doses of Si, an increase in fruit pH was recorded, while treatments with 100 mM NaCl with both doses of Si significantly reduced the TA values. The TSS/TA ratio increased with both doses of Si in the treatments with 100 mM NaCl. It is concluded that the combination of saline treatments with silicon can improve some quality attributes of tomato cv. Río Supremo fruits. [ABSTRACT FROM AUTHOR]

Copyright of Terra Latinoamericana is the property of Sociedad Mexicana de la Ciencia del Suelo A.C. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Agro Productividad is the property of Colegio de Postgraduados and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Agro Productividad is the property of Colegio de Postgraduados and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The object of this work was to characterize varieties in recent years have used different types of morphological, biochemical and molecular methods. The aim of this study was to characterize molecular genetic variability in varieties of sugarcane (Saccharum spp.) grown in the state of Tabasco, Mexico, by AFLP. It used 12 varieties of sugarcane. Young leaves of plants growing in the field were selected for experiment. After making 12 combinations of primers, the results indicated that the combination E-ACC/M-CTA produced 72 to 1353 bp polymorphic fragments. The dendrogram revealed two distinct groups of Saccharum spp. and a variety that differed from both. Group I comprised the varieties C 87-51, 96-40 ATM, B 4362, 69-290 Mex, Mex Mex 91-130 and 57-1285, which formed a cluster and showed a similarity of 0.77%. Group II included the varieties RD 75-11, Mex 79-431, SP 70-1284, 72-2086 and CP Mex 59-32 which formed another cluster with 0.70%. The variety Mex 68-P-23 differed from the other 11 varieties. [ABSTRACT FROM AUTHOR]