亚精胺对青海扁茎早熟禾幼苗抗旱性的影响  

Effect of Spermidine on Drought Resistancein Poa pratensis var.anceps Gaud.Cv.Qinghai

作　　者：马祥[1] 贾志峰 张永超 MA Xiang(Key Laboratory of Superior Forage Germplasm in the Qinghai-Tibetan Plateau,Qinghai Academy of Animal Science and Veterinary Medicine,Xining 810016)

机构地区：[1]青海大学畜牧兽医科学院青海省青藏高原优良牧草种质资源利用重点实验室,西宁810016

出　　处：《青海畜牧兽医杂志》2020年第5期9-15,共7页Chinese Qinghai Journal of Animal and Veterinary Sciences

基　　金：青海省科技厅青年基金“青藏高原地区不同年龄老芒麦种质资源的繁殖策略变化规律”(2018-ZJ-968Q);青海省科技厅重点实验室发展专项“青海省青藏高原优良牧草种质资源利用重点实验室”(2020-ZJ-Y03);国家地区自然基金“基于生态化学计量特征学的青海扁茎早熟禾种子生产生活史繁殖策略调控研究”(31760711)。

摘　　要：干旱是影响植物代谢和生长发育的重要非生物胁迫因素之一。因此,本试验以青海扁茎早熟禾(BJ)为材料,采用PEG6000模拟干旱胁迫,研究叶面喷施不同浓度Spd(0、0.01、0.05、0.1、0.5、1mmol·L^-1)后BJ相关生理指标的变化,旨在寻找一种人为改善BJ抗旱性的途径。研究结果表明,喷施一定浓度Spd能通过增加干旱胁迫下BJ叶片相对含水量、叶绿素含量、脯氨酸含量和可溶性糖含量,提高SOD活性和CAT活性,从而降低O2^-·产生速率,减少MDA积累,提高BJ的抗旱性。综合分析表明0.05mmol·L^-1 Spd处理效果最好。Drought is one of the important abiotic stress factors affecting plant metabolism, growth and development. For the purpose of finding a way to improve the drought resistance of BJ, the changes of physiological indexes of Poa pratensis var.anceps Gaud.Cv.Qinghai(BJ) were observed after spraying with different concentrations of Spd(0、0.01、0.05、0.1、0.5、1 mmol·L-1), which were cultivated under drought stress simulated by PEG 6000. Studies have shown that spraying Spd with a certain concentration can increase relative water content, chlorophyll content, proline content and soluble sugar content;improve SOD and CAT activity, and reduce O2-· generation rate and MDA content under drought stress. Therefore, Spd can improve the drought resistance of BJ. Comprehensive analysis showed that 0.05 mmol·L-1 was the optimal spraying concentration.

关 键 词：青海扁茎早熟禾 SPD 干旱胁迫 抗旱性 

分 类 号：S513[农业科学—作物学]