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作者 Solis Perez, Alma Rosa
書名 Characterizing salinity tolerance in greenhouse roses
國際標準書號 9781109327465
book jacket
說明 240 p
附註 Source: Dissertation Abstracts International, Volume: 70-08, Section: B, page: 4554
Advisers: Raul I. Cabrera; Michael A. Arnold
Thesis (Ph.D.)--Texas A&M University, 2009
Among ornamental plants, roses (Rosa L.) are considered the most economically important, being among the most popular garden shrubs, as well as the favorite cut flowers sold by florists. In the past roses have been classified as fairly salt-sensitive, however, recent nutrition studies suggest that they may actually tolerate moderate to relatively high salinities. The general objective of this research was to reassess the limits of tolerance to salinity of roses and the influence of the rootstock used, to determine the ameliorative properties of supplemental Ca2+ on the response to salt stress, and to establish the influence of Na+- and Cl-counter ions on the detrimental effects caused by these salinizing elements
The NaCl or NaCl-CaCl2-salinity tolerance limit for greenhouse roses, although greatly influenced by the rootstock, was between 12 and 15 mmol·L-1. Plants grafted on 'Manetti' sustained their productivity/quality characteristics for longer time periods, tolerated greater salinity concentrations, and accumulated less Cl- and Na+ in leaves of flowering shoots than those grafted on 'Natal Briar', confirming the greater ability of the former rootstock to tolerate salt stress
Supplementing the saline solution with 0-10 mmol·L-1 Ca2+ (as CaSO4) did not alleviate the harmful effects caused by NaCl-salt stress (12 mmol·L-1) on the productivity and quality responses of roses
The detrimental effects caused by Na- and Cl-based salinity were greatly influenced by the composition of the salt mixtures (i.e. their counter ions). Sodium sulfate and CaCl2 were the least harmful salts; NaCl had intermediate effects, while NaNO3 and KCl were the most deleterious. Among the most distinguishable effects caused by the more toxic Na + and Cl- counter ions were lower osmotic potential (piSS) and greater electrical conductivity (ECSS) of the salinized solutions, markedly increased uptake and/or transport of either Na+ or Cl- to the flowering shoot leaves, and altered uptake and/or transport of other mineral nutrients
Computations of the saline solutions' chemical speciation revealed that salts containing divalent ions had lower ionization and exhibited greater ion associations compared to monovalent ion salts, rendering a lower number in free ions/molecules in solution which caused greater piSS and lower ECSS in those solutions
School code: 0803
Host Item Dissertation Abstracts International 70-08B
主題 Agriculture, Horticulture
Biology, Plant Physiology
0471
0817
Alt Author Texas A&M University
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