Hu, X. W.

Wang, Yanrong

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings XXI International Grassland Congress / VIII International Rangeland Congress The Role of the Lens in Controlling Physical Dormancy Breakdown in Three Legume Species X. W. Hu Lanzhou University, China Yanrong Wang 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/21/14-1/37 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. 瞯 ]586　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅱ 　Grasslands/Rangelands Production Systems——— Seed Science and TechnologyThe role of the lens in controlling physical dormancy breakdown in three legume speciesX .W . Hu and Y . R .W angCollege o f Pastoral A griculture Science and Technology , L anz hou University , China , E‐mail : y rw ang＠ lz u .edu .cnKey words : legume , hilum , seed dormancy , water entry siteIntroduction The primary site of water entry into legume seeds after dormancy‐breaking treatment is still controversial ( Baskinet al . , ２０００) . In this study , the role of the lens in breaking physical dormancy was examined .Materials and methods Seeds of Sophora alopecuroides , V igna oblongi f olia and Sesbania sesban were scarified with sulfuricacid for ２０ , １ , and １ min , and with ８０ ℃ water for １０ , ３ , and ３ min , respectively for dormancy breaking . Randomly １００ seedswere taken from each scarified seed lot and subjected to one of four blocking treatments : １) no blockage , ２ ) vaseline applied tohilum , ３) vaseline applied to lens , and ４ ) vaseline applied to the extrahilar testa . Each treatment with four replicates of ２５seeds were placed on top of moistened paper in petri dishes and incubated in darkness at ２５ ℃ for １４ days . Number of imbibedseed was counted daily .Results and discussion Compared to no blockage , lens blockage prevented seed imbibition completely in S . sesban , and reducedimbibed seeds significantly in V . oblongi f olia , but did not affect S . alopecuroides . Hilum blockage reduced imbibed seeds ofS . alopecuroides and V . oblongi f olia significantly , but scarification did not affect seeds of S . sesban . Extrahilar regionblockage reduced imbibed seeds significantly in S . alopecuroides and V . oblongi f olia but not in S . sesban for hot waterscarified seeds . However for sulfuric acid scarification , extrahilar region blockage showed no effects on imbibition in all testspecies . Therefore , the water entry into seeds was only through the lens in S . sesba , but for other two species , watermovement through the hilum , lens or extrahilar region depended on the treatments .Table 1 Percentages o f imbibed seed o f di f f erent treatments incubated in darkness at ２５ ℃ f or １４ days .Species T reatments Noblockage Lensblockage Hilumblockage Extrahilar regionblockageSophora alopecuroides Sa ２０ min ４０ a ３７ a ０ b ４５ aHw １０ min ６５ a ５８ a ２０ b ３５ bV igna oblongi f olia Sa １ min ９５ a ７５ b ８ c ８９ aHw ３ min １００ a ８５ b ４ c ８０ bSesbania sesban Sa １ min ５２ a ０ c ５０ a ４７ aHw ３ min ８５ a ０ b ８２ a ８０ aMeans within the same row followed by different letter was significant different ( P ＜ ０ .０５ ) ; Sa : sulfuric acid ; Hw : hot waterConclusions Route of water entry into seed varied with species and dormancy breaking treatments . These results may help toexplain the controversial points obtained from previous researchers in this fieldReferenceBaskin , J .M . , Baskin , C .C . & X . Li ( ２０００ ) . Taxonomy , anatomy and evolution of physical dormancy in seeds . PlantS pecies Biology １５ , １３９‐１５２ .

The Role of the Lens in Controlling Physical Dormancy Breakdown in Three Legume Species

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The Role of the Lens in Controlling Physical Dormancy Breakdown in Three Legume Species

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