文献知网节
  • 记笔记

Carbon dioxide enrichment ameliorates negative effects of elevated ozone in tropical wheat(Triticum aestivum L.) cultivars:An insight into metabolism,yield and grain quality

Amit Kumar MishraS.B.AgrawalMadhoolika Agrawal

Laboratory of Air Pollution and Global Climate Change,Department of Botany,Banaras Hindu University

摘要:Carbon dioxide(CO2) and ground-level ozone(O3),two important components of global climate change,are rising continuously in the atmosphere and impart their significant impacts on growth and yield of various crop plants.The present study was performed to assess the growth,physiological,yield and grain quality responses of two cultivars(Malviya-37 and K-9107) of tropical wheat(Triticum aestivum L.) against elevated levels of CO2 and O3,individually and in combination under near-natural conditions.Plants were continuously exposed to elevated levels of CO2(700 ppm) and O3(ambient + 10 ppb;nearly 25%of ambient) for four hours(11.00 to 15.00h) in specially designed open top chambers(OTCs) from germination to the seed maturity.Growth and yield of the plants significantly increased under elevated CO2(EC) and combination of EC with elevated O3(ECO) as compared to the plants grown in ambient air(control).Under elevated O3(EO),significant reductions were observed in all the growth and yield attributes and the extent was higher in Malviya-37 as compared to K-9107.Elevated CO2 stimulated the net photosynthetic rate(Ps),photochemical efficiency(F/Fm) and reduced the stomatal conductance(gs).Reactive oxygen species(-.O2 production rate and H2O2 content),lipid peroxidation,activities of antioxidative enzymes,ascorbic acid and total phenolics were higher,whereas Ps′ gs′ Fv/Fm,soluble protein and photosynthetic pigments were reduced under elevated O3 exposure.Under combined treatment,EC modified the plant performance against O3 in both the cultivars.Soluble protein and total free amino-acids decreased in grains of EC,ECO and EO in both the test cultivars.Total soluble sugars and starch contents in grains increased due to EC and ECO and reduced under EO,however reducing sugars showed an opposite trend in both the cultivars.Results of the present study clearly suggested that(i) response was differential as Malviya-37 proved to be more sensitive against elevated O3 as compared to K-9107,and(ii) elevated CO2 provided significant protection to wheat cultivars against negative impact of elevated O3.The study concludes that elevated CO2 has the potential to modify seed yield and its quality in wheat by improving stress tolerance traits against O3.
会议名称:

第七届国际作物科学大会

会议时间:

2016-08-14

会议地点:

中国北京

  • 专辑:

    农业

  • 专题:

    农作物

  • 分类号:

    S512.1

  • 手机阅读
    即刻使用手机阅读
    第一步

    扫描二维码下载

    "移动知网-全球学术快报"客户端

    第二步

    打开“全球学术快报”

    点击首页左上角的扫描图标

    第三步

    扫描二维码

    手机同步阅读本篇文献

  • CAJ下载
  • PDF下载

下载手机APP用APP扫此码同步阅读该篇文章

下载:3 页码:121 页数:1 大小:119k

相关推荐
  • 相似文献
  • 读者推荐
  • 相关基金文献
  • 关联作者
  • 相关视频