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1、第28卷第2期四川农业大学学报Vol.28No.22010年6月JournalofSichuanAgriculturalUniversityJun.2010红花檵木叶色转变过程中的叶表皮特征变化袁明,李旭,纪少云,刘静,周莉君(四川农业大学生命科学与理学院,四川雅安625014)摘要:红花檵木是一种在园林绿化上广泛应用的彩叶植物,叶色夏季会出现/返青0现象,导致观赏价值降低。对红花檵木的红叶、转绿后的绿叶和回复突变的绿叶以及原变种檵木的叶片的叶表皮特征进行了研究发现:¹檵木及其变种红花檵木的不同叶片中表皮毛均为单细胞型,有单根
2、型的,也有2~多根表皮毛1束型的,以1~4根1束的表皮毛类型为主,表皮毛的分布下表皮均多于上表皮;º表皮毛的分布规律檵木与红叶相似,转绿与复绿相似,红花檵木转绿后表皮毛的数量下降60%以上;»红花檵木叶片转绿后上表皮细胞显著缩小,下表皮和气孔器略微增大,气孔指数无显著变化。关键词:红花檵木;檵木;叶表皮;表皮毛中图分类号:S685.99文献标识码:A文章编号:1000-2650(2010)02-0169-05VariationofLeafEpidermisTraitsDuingLeafColorTransformationin
3、Loropetalumchinensevar.rubrumYUANMing,LIXu,JIShao-yun,LIUJing,ZHOUL-ijun(CollegeofBiologyandScience,SichuanAgriculturalUniversity,Yaan625014,Sichuan,China)Abstract:LoropetalumchinenseOlivevar.rubrumYiehhasbeenwidelyusedtobeautifycitiesandroadsbecauseofitsredleaves,w
4、hich,however,willturngreenduringsummertime.Thisstudywasmadeontheleafepidermis,trichomes,Stomataofredleaves,greenleavesofL.chinenseO-livevar.rubrumandgreenleavesofitsbackmutation,andleavesofL.Olive.Theresultsshowed:¹TrichomesofL.chinenseanditsvariationwerecomposedofs
5、inglecells.Someweresimpletr-ichomes,somewere2ormorearmed,ofwhichmostweresimpleand2to4armed.Thetrichomesdistributedonthedown-epidermisweremorethanthoseontheup-epidermis.ºThedistributionruleoftrichomesontheleavesofL.chinensewasthesameasthatontheredleavesofL.chinenseva
6、r.rubrum,andonthegreenleavesofL.chinensevar.rubrumwasthesameasthatontheleavesofbackmutation.Afterturninggreen,thenumberoftrichomesontheleavesepidermisdecreaseddramatically.»Afterredleavesturnedgreen,up-epidermiscellsizeshrankremarkably,whiledown-epidermiscellsizeand
7、stomataincreasedslightly,andstomataindexchangedlittle.Keywords:L.chinensevar.rubrum;L.chinense;leafepidermis;trichomes红花檵木(LoropetalumchinenseOlivevar.红花檵木在春季新叶叶色红艳,到盛夏叶色变[4]rubrumYieh)系金缕梅科(Hamamelidaceae)檵木绿,出现/返青0现象,降低了观赏价值。现在国内属常绿灌木或小乔木,野生资源零星分布于湖南和广泛栽培的红花檵木是通过芽
8、变后筛选得到的,我[1]江西海拔100~400m的常绿阔叶林地带,其生态们观察到在园艺栽培的过程中,红花檵木也有少部适应性强,耐修剪,繁殖快,栽培管理容易,是现代园分植株叶色回复突变为绿色,但花仍为红色,与檵木[2-3]林色彩布置中优良的彩叶植物。的花白色不同。叶色转绿降低了