上海地区夏季干旱、强光照对草地早熟禾的影响  

Effects of summer drought and strong light stress on Kentucky bluegrass in Shanghai

作　　者：袁晓君[1] 龚振德 涂明月 陈祖春 吴月琴 何亚丽[3] YUAN Xiaojun;GONG Zhende;TU Mingyue;CHEN Zuchun;WU Yueqin;HE Yali(Shanghai Key Laboratory of Bio-Energy Crops/School of Life Science,Shanghai University,Shanghai 200444,China;Shanghai Municipal Experiment Station of Flower Variety Improvement,Shanghai 201615,China;School of Agriculture and Biology,Shanghai Jiaotong University,Shanghai 200240,China)

机构地区：[1]上海市能源作物育种及应用重点实验室/上海大学生命科学学院,上海200444 [2]上海市花卉良种试验场,上海201615 [3]上海交通大学农业与生物学院,上海200240

出　　处：《草业科学》2019年第8期2017-2025,共9页Pratacultural Science

基　　金：国家自然科学基金青年科学基金(31502002);沪农科攻字(2013)第1-1号

摘　　要：草地早熟禾(Poa pratensis)是一种重要的优质冷季型草,在湿润冷凉的地区可以保持周年常绿,但在上海地区越夏困难。本研究对8个越夏性不同的草地早熟禾材料进行了夏季田间持续高温下的4种处理,分别为干旱/强光、干旱/遮阴、浇水/强光、浇水/遮阴。结果显示,叶片含水量随土壤含水量下降而下降,当叶片含水量约低于70%时,植株表现出明显的受胁迫状态。干旱对草地早熟禾造成的伤害比强光照/紫外更大,在干旱条件下强光照/紫外会加重草地早熟禾的伤害程度。此外,不同草地早熟禾材料在干旱和强光照胁迫下表现并没有显著差异,只要有充足的水分,这些材料都能保持良好的状态。因此推测,造成草地早熟禾在上海地区越夏困难的主要非生物胁迫因子是干旱,造成不同材料间越夏性差异的原因可能是生物胁迫(如锈病)。Kentucky bluegrass(Poa pratensis)is an important cool-season turf grass,which can remain green in wet and cool areas year-round.However,it is difficult for it to survive in summer in Shanghai.In this study,eight Kentucky bluegrass cultivars with different summer stress tolerance were processed in the field under four stress treatments:drought/bright light,drought/shade,water/bright light,and water/shade.The results showed that leaf water content declined with the decrease in soil water content.When the leaf water content was less than 70%,the plants displayed obvious injuries.Drought caused more damage to plants than did intense light/UV,and intense light/UV exposure in dry conditions aggravated the damage to plants.There was no significant difference in drought and intense light/UV tolerance among the grass types,and these types could be maintained in good condition if given sufficient supply of water.Therefore,it was speculated that drought was the main abiotic stress factor that caused the difficulty in growing Kentucky bluegrass over the summer in Shanghai,and the reason for the difference in summer tolerance among the types might have been caused by biological stress(such as rust).

关 键 词：草地早熟禾 干旱胁迫 高光强胁迫 越夏性 

分 类 号：S688.4[农业科学—观赏园艺]