Clapp, C. E.

Loffredo, E.

Palazzo, A. J.

Senesi, N.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings XXI International Grassland Congress / VIII International Rangeland Congress Germination and Early Growth of Slickspot Peppergrass (Lepidium papilliferum) as Affected by Desert Soil Humic Acids E. Loffredo University of Bari, Italy A. J. Palazzo Cold Regions Research and Engineering Laboratory N. Senesi University of Bari, Italy C. E. Clapp U.S. Department of Agriculture Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/13-1/10 The XXI International Grassland Congress / VIII International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. brought to you by COREView metadata, citation and similar papers at core.ac.ukprovided by University of Kentucky　 Multifunctional Grasslands in a Changing World 　 Volume Ⅱ 　 瞯 ]453　 瞯Grasslands/Rangelands Production Systems——— Domestication of Native Grasslands/Rangelands Plants for Regional UseGermination and early growth of slickspot peppergrass ( Lepidium papilli f erum) as affected bydesert soil humic acidsE . Lo f f redo1 , A . J . Palaz zo2 , N . Senesi1 and C . E . Clap p 31 D IBCA . , University o f Bari , 70126‐Bari , Italy . E‐mail : senesi＠ agr .uniba .it 2 ERDC‐CRREL , H anover , N H 03755‐1290 , USA 3 USDA‐ARS and University o f M innesota , St . Paul , MN 55108 , USAKey words : slickspot peppergrass ,soil humic acids ,effects on germination ,effects on early grow thIntroduction Slickspot peppergrass ( Lep idium pap illi f erum ) is a reported �rare" ephemeral endemic plant growing in theSouthwest Idaho high desert , USA ( Meyers et al ２００５) , whose seeds can remain dormant for several years . In １９９９ this plantwas listed as a species with�high" threat magnitude , and�imminent" immediacy of threat , under the Endangered Species Act .The name of the plant derives from its association with slickspots , which are small , crusted‐or smooth‐surfaced depressions inthe soil that collect water within the region摧s sagebrush‐steppe ecosystem , and form a unique microhabitat in western US basinssuch as the Idaho Snake River plain ( Moseley １９９４) . The objective of this study was to evaluate the effects of soil humic acidson the germination and early grow th of slickspot peppergrass .Materials and methods Three humic acids were isolated from the silt ( HAs) , vesicular ( HAv ) and clay ( HAc) layers of anIdaho soil according to conventional standard procedures , and characterized for their chemical and physico‐chemical propertiesby chemical methods and Fourier transform infrared and fluorescence spectroscopies . The three HAs were used at threeconcentrations (１０ , ５０ and ２００ mg/ L ) to measure their effects on seed germination of slickspot peppergrass in Petri dishes for１１ days , and subsequent seedling early grow th for ２４ days . The experiments were conducted in four replicates in controlledconditions of temperature , humidity and illumination in a Fitotron chamber . Data obtained were subjected to statistical analysisby ANOVA . The possible relation of the effects measured with the compositional , structural and functional features of theHAs studied was also evaluated .Results Statistical analyses of data show that ( Figures １ and ２) : ( a) HAs at any concentration increases seedling primary rootlength and generally promotes early plant grow th , but has a concentration‐differentiated effect on the germination ％ andseedling primary shoot length ; ( b) HAv at any concentration exerts a positive effect on the germination ％ and root elongationbut a depressing effect on shoot elongation ; and ( c ) HAc promotes germination ％ and root elongation at the highestconcentrations with no or depressing effect at the lowest concentration , whereas the effect on shoot elongation is concentration‐dependent .Figure 1 E f f ects o f humic acids at di f f erentconcentrations on the ％ o f germinated seeds relative tothe control treatment (１００ ％ ) , measured af ter １１ dayso f germination . Vertical bars indicate the standarder ror (n ＝ ４ ) .　Figure 2 E f f ects o f humic acids at di f f erent concentrationson the lengths o f shoots and roots as percentages relative tothe control treatment ( １００ ％ ) , measured af ter ２４‐daygrow th . Vertical bars indicate the standard error (n ＝ ４ ) .Conclusion The effects of HAs on germination and early grow th of slickspot peppergrass can be related to their different C , H ,N , and O contents , C /N ratio , aliphaticity , and amide , carboxylic and fluorescent groups contents .ReferencesMeyer SE , Quinney D , Weaver J ( ２００５ ) A life hystory study of the Snake River Plains endemic Lep idum pap illi f erum(Brassicacee) .Western North American Naturalist , ６５ , １１‐２３ .Moseley RK (１９９４) Report on the conservation status of Lep idum pap illi f erum . Status Survey Report . Idaho Dep artmento f Fish and Game , Boise , ID .Acknowledgement This work was supported by the Research Contract n . N６２５５８‐０３‐M‐００１０ of the US Army EuropeanResearch Office , London , England .

Germination and Early Growth of Slickspot Peppergrass (\u3ci\u3eLepidium papilliferum\u3c/i\u3e) as Affected by Desert Soil Humic Acids

https://uknowledge.uky.edu/cgi/viewcontent.cgi?article=3396&amp;context=igc

Germination and Early Growth of Slickspot Peppergrass (\u3ci\u3eLepidium papilliferum\u3c/i\u3e) as Affected by Desert Soil Humic Acids

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