干旱度对西南荩草有性繁殖指数及种子产量的影响  

Effects of drought degree on sexual reproduction index and seed yield of Arthraxon hispidus

作　　者：杨梦含 曾晓琳[1] 游明鸿[2] 刘金平[1] 杨琳雅 YANG Menghan;ZENG Xiaolin;YOU Minghong;LIU Jinping;YANG Linya(School of Life Sciences,China West Normal University,Nanchong 637009,China;Academy of Sichuan Grassland Science,Hongyuan 624400,China)

机构地区：[1]西华师范大学生命科学学院,四川南充637009 [2]四川省草原科学研究院,四川红原624400

出　　处：《草学》2024年第1期30-35,共6页Journal of Grassland and Forage Science

基　　金：四川省交通运输科技项目(2019-ZL-19)资助。

摘　　要：为研究乡土草坪草种质资源西南荩草的开发利用潜力,通过设置4个干旱梯度(水分充足、轻度、中度和重度干旱),测定花芽分化期、花数、种子数、生物量等指标,分析干旱对荩草繁殖分配、繁殖指数、繁殖效益及种子产量的影响。结果表明:干旱度显著影响繁殖期和繁殖器官数量,重度干旱可提前18d开花,轻度和中度干旱可增加花穗数和小花数;干旱度显著影响生物量结构,影响为总生物量>非繁殖器官生物量>繁殖器官生物量,干旱限制非繁殖器官生物量,轻度和中度可增加繁殖器官生物量;干旱度显著影响繁殖效益指标,影响为繁殖比率>繁殖效率指数>繁殖指数>繁殖分配,轻度和中度干旱可显著提高繁殖效益指标;干旱度显著影响种子产量,影响为实际种子产量>潜在种子产量>表现种子产量,轻、中、重度干旱使实际种子产量分别下降14.02%、29.07%、55.54%;干旱度对发芽指标影响大小为种子发芽率>发芽势>发芽指数>活力指数,仅显著降低发芽率和发芽势。综上,干旱度显著影响西南荩草有性繁殖指数及种子产量,荩草可依据干旱度调节繁殖投入和维持繁殖收益,为护坡草坪自播和种群更新奠定种子基础。In order to study the development and utilization potential of Arthraxon hispidus,which as a local turfgrass germplasm re⁃sources,the A.hispidus seedlings were treated under 4 drought degrees(sufficient water,mild,moderate,and severe drought)individu⁃ally.By measured indicators such as flower period,flowers number,seeds number and biomass,to analyzed the effects of drought on the reproductive allocation,reproductive index,reproductive efficiency,and seed yield of A.hispidus.The results showed that:Drought de⁃grees significantly affected the reproductive period and the number of reproductive organs.Severe drought leaded flowering 18 days earlier,while mild and moderate drought increased the number of flower spikes and small flowers;Drought degrees significantly affected the biomass structure,with an impact of total biomass>non reproductive organ biomass>reproductive organ biomass.Drought limited total and non repro⁃ductive organ biomass,but mild and moderate drought increased reproductive organ biomass;Drought significantly affected reproductive in⁃dicators,which as reproductive ratio>reproductive efficiency index>reproductive index>reproductive allocation.Mild and moderate drought significantly improved the reproductive indicators;Drought significantly affected seed yield,with actual seed yield>potential seed yield>per⁃formance seed yield.Light,medium,and severe droughts caused actual seed yield to decreased by 14.02%,29.07%,and 55.54%,re⁃spectively;Effect of drought on germination indicators was as follows:seed germination rate>germination potential>germination index>vital⁃ity index,but only reduced germination rate and germination potential.In summary,drought degrees significantly affectd the sexual repro⁃duction index and seed yield of the A.hispidus.According to drought degrees,A.hispidus could adjust reproductive inputs and maintain re⁃productive benefits,to laying a seed foundation for self sowing and population renewal of slope protection lawns.

关 键 词：荩草 克隆生长 有性繁殖 草坪草 繁殖效率 

分 类 号：S688.4[农业科学—观赏园艺]