Ultraviolet-B radiation damage on Kentucky Bluegrass II: Hormone supplement effects
Ultraviolet-B radiation damage on Kentucky Bluegrass II: Hormone supplement effects
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DOI：
10.21273/hortsci.39.6.1471
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发表时间：
2004-10-01
期刊：
影响因子：
1.9
通讯作者：
Fike, JH
中科院分区：
文献类型：
--
作者：
Ervin, EH;Zhang, XZ;Fike, JH
高紫外线-B（UV-B; 290-320 nm波长）辐射对肯塔基州早熟禾（Poa pratensis L.）夏季移栽时，抗氧化剂和保护性色素可能参与植物防御UV-B引起的氧化胁迫。某些外源激素可能通过上调植物防御系统来减轻UV-B的伤害。本研究的目的是确定外源激素或类激素物质是否可以减轻UV-B对“乔治敦”肯塔基州早熟禾（Poa pratensis L.）在温室条件下。激素水杨酸在150毫克（.）m（-2）和含腐殖酸物质腐殖酸（HA）150 mg（.）m（-2）和海藻提取物（SWE）50 mg（.）m（-1），然后用UV-B辐射（70 μ mol.）m（-2.）s（-1））。UV-B辐射胁迫降低草坪质量的51%至66%和63%至68%的光化学效率时，测量10或12天后开始的UV-B。UV-B胁迫降低了内源α-生育酚（AT）和抗氧化酶（超氧化物歧化酶（SOD）和过氧化氢酶）。花青苷含量在连续UV-B辐射的第1 ~ 5天增加，第5 ~ 10天下降。SA和HA + SWE的应用增强了86%和82%，分别在UV-B引发后10或12天测量的光化学效率。此外，激素补充剂的应用增加AT浓度，SOD，过氧化氢酶活性和花青素含量相比，在UV-B启动后10天的控制。在UV-B胁迫下，AT浓度、SOD和过氧化氢酶活性较高的早熟禾表现出较好的视觉品质。本研究的结果表明，叶面喷施SA和HA + SWE可以缓解光化学效率和草坪质量的下降与夏季增加UV-B光水平。
High ultraviolet-B (UV-B; 290-320 nm wavelength) radiation may significantly contribute to the quality decline and death of kentucky bluegrass (Poa pratensis L.) sod during summer transplanting. Antioxidants and protective pigments may be involved in plant defense against oxidative stress caused by UV-B. Selected exogenous hormones may alleviate UV-B damage by upregulating plant defense systems. The objectives of this study were to determine if exogenous hormone or hormone-like substances could alleviate UV-B damage to 'Georgetown' kentucky bluegrass (Poa pratensis L.) under greenhouse conditions. The hormone salicylic acid at 150 mg(.)m(-2) and the hormone-containing substances, humic acid (HA) at 150 mg(.)m(-2) and seaweed extract (SWE) at 50 mg(.)m(-1), were applied to plugs of kentucky bluegrass and then subjected to UV-B radiation (70 mumol(.)m(-2.)s(-1)). The UV-B irradiation stress reduced turf quality by 51% to 66% and photochemical efficiency by 63% to 68% when measured 10 or 12 days after initiation of UV-B. Endogenous alpha-tocopherol (AT) and antioxidant enzymes (superoxide dismutase (SOD) and catalase) were reduced by UV-B stress. Anthocyanin content was increased from day 1 to 5 and then decreased from day 5 to 10 of continuous UV-B irradiation. Application of SA and HA + SWE enhanced photochemical efficiency by 86% and 82%, respectively, when measured 10 or 12 days after UV-B initiation. In addition, application of the hormonal supplements increased AT concentration, SOD, catalase activity, and anthocyanin content when compared to the control at 10 days after UV-B initiation. Bluegrass with greater AT concentration and SOD and catalase activity exhibited better visual quality under UV-B stress. The results of this study suggest that foliar application of SA and HA + SWE may alleviate decline of photochemical efficiency and turf quality associated with increased UV-B light levels during summer.