Hu, X. W.

Wang, Yanrong

Yang, L.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings XXI International Grassland Congress / VIII International Rangeland Congress Effect of Temperature and Moisture on Physical Dormancy Release in Two Populations of Sophora alopecuroides L. Yang Lanzhou University, China Yanrong Wang Lanzhou University, China X. W. Hu Lanzhou University, China 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/21/14-2/15 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. 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅱ 　 瞯 ]613　 瞯Grasslands/Rangelands Production Systems——— Seed Science and TechnologyEffect of temperature and moisture on physical dormancy release in two populations of SophoraalopecuroidesL .Y ang , Y .R .W ang and X .W .HuCollege o f Pastoral A griculture Science and Technology , L anz hou University , China E‐mail : y rw ang＠ lz u .edu .cnKey words :Sophora alopecuroides , physical dormancy ,dry heat , wet heatIntroduction The seeds of most species of Fabaceae have physical dormancy which is broken by some unknown factors in thefield (Baskin & Baskin , １９９８) . Present study simulated the humid and dry condition according to the natural situation‐buriedin the soil and on the soil surface , and set the temperature treatments according to the local temperature pattern .Materials and methods Sixteen seeds of each population were cut in longitudinal direction and observed under ２０X magnificationwith Olympus SZX１２ Dissecting Microscope . Seed radius , seed coat thickness and hilum thickness were measured by Image‐Pro Plus software with a calibrated scale . Four replications with ５０ seeds each were taken from each population and subjected toone of eight treatments : four temperature levels factorial combined with two moisture conditions . For each population , thetemperature used was : constant temperature ３０ ℃ , ４０ ℃ , ５０ ℃ , ６０ ℃ and the water content used was : １００ grams sand withdifferent water content (０％ and ５％ ) was enclosed in aluminum box and pre‐treated in an incubator to the desired temperature ,then plus the seed in the sand and mix together . Af ter heating for two weeks , the seeds were extracted from the sand using asieve . Germinated , damaged , intact and un‐germinated seeds were counted . The intact and un‐germinated seeds were put in thePetri dishes to do germination test at constant temperature of ２５ ℃ under dark condition . Seeds imbibed and not imbibed werecounted after １４ days .Results Dry heat significantly broke seed dormancy from Ejina County when temperature exceeds ５０ ℃ , but no effects wereobserved in seeds of Zuo County whatever temperature was used . Wet heat always showed more effective in breaking dormancyon seeds of Ejina County , but only treatment with higher than ５０ ℃ did significantly break seed dormancy for seeds of ZuoCounty . The percentage of dormant seeds of two populations was not significantly different only when temperature is ６０ ℃ withwet condition ( Table １ ) . Seeds from Ejina County exhibited significantly higher thousand seed weight than that from ZuoCounty , but the seed radius did not show significant difference ( Table ２) . Seed coat was thicker and seed color was lighter inthe seeds of Ejina County , and a significantly higher seed coat thickness beneath hilum was also observed in the seeds fromEjina County (１８０ ＋ ５ .８ ) than that from Zuo County(１６３ ＋ ６ .７ ) ( Table ２) .Table 1 Percentage o f dormant seeds a f ter p re‐treating w ith dry heat and wet heat under di f f erent temperature condition .Populations Dry heat Wet heat３０ 挝４０ 剟５０ :６０ 痧３０ 後４０ 棗５０ M６０ 骀CKEjina ８０a ６９ab ５１cd ５４cd ６０bc ４５d １７e １０e ７６aZuo ９２a ９２a ９０a ８７a ９１a ９１a ５１b １３c ８８aP ＜ ０ 墘.００１ ＜ ０ ?.００１ ０ 乔.００１ ＜ ０ �.００１ ＜ ０ 湝.００１ ＜ ０ R.００１ ０ 谮.００４ ０ 憫.７２７ ０  .００１Table 2 Comparison o f morphology and anatomy o f two populations o f S . alopecuroides .Population Color Seed radius( mm) １０００ Seed weight( g ) Seed coat thickness( um) Hilum thickness( um)Ejina yellow ３ 热.３４ ± ０ .０２ ２４ b.０ ± ０ .３４ 倡 ４８ ± ２ 敂.７ １８０ ± ５  .８ 倡Zuo brown ３ 热.０７ ± ０ .０４ １９ b.３ ± ０ .５１ ４５ ± ２ 敂.４ １６３ ± ６  .７Conclusions Seeds of S . alopecuroides from two populations exhibit different requirements for dormancy breaking and showdifferent dormancy release patterns , which may attribute to seed coat color and seed coat thickness beneath hilum . In addition ,wet heat is identified as an important dormancy release mechanism in seeds of S . alopecuroides .Acknowledgement The study was funded by National Basic Research Program (９７３ program) of China (２００７CB１０８９０４) .ReferenceBaskin C . C . & J . M . Baskin ( １９９８ ) . Seeds : ecology , biogeography , and evolution o f dormancy and germination ,A cademic Press , San Diego , CA , USA .

Effect of Temperature and Moisture on Physical Dormancy Release in Two Populations of \u3ci\u3eSophora alopecuroides\u3c/i\u3e

https://uknowledge.uky.edu/cgi/viewcontent.cgi?article=3583&amp;context=igc

Effect of Temperature and Moisture on Physical Dormancy Release in Two Populations of \u3ci\u3eSophora alopecuroides\u3c/i\u3e

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