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首页> 外文期刊>Functional Plant Biology >Responses of pea plants to elevated UV-B radiation at varying nutrient levels: N-metabolism, carbohydrate pool, total phenolics and yield
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Responses of pea plants to elevated UV-B radiation at varying nutrient levels: N-metabolism, carbohydrate pool, total phenolics and yield

机译：豌豆植物在不同营养水平下对升高的UV-B辐射的响应：氮代谢，碳水化合物库，总酚和产量

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摘要

The effects of elevated UV-B (280-315 nm) were assessed on nitrogen metabolism, carbohydrate pool, total phenolics, photosynthetic pigments, UV-B absorbing compounds, variables related to oxidative stress, biomass and yield of pea plants grown under various levels of NPK. The NPK levels assayed were: background NPK level (F-0); recommended NPK (F-1) and recommended NK+ 1.5 x recommended P (F-2) and the UV-B levels were: control (C) and elevated (T). The responses of T plants varied with different combinations of NPK. Yield reduced under elevated UV-B at all NPK levels with maximumreduction in F0T and minimum reduction in F1T. Leghaemoglobin content was reduced under elevated UV-Bat all NPK levels. Maximum increase in malondialdehyde content recorded in F0T plants corresponded with higher superoxide and hydrogen peroxide contents. Nitrite reductase activity decreased significantly under UV-B at all NPK levels, but nitrate reductase activity increased significantly in F1T and F2T. Maximum reduction in C : N ratio of leaves in F2T plants suggests competition between sucrose synthesis and nitrate reduction under additional P level. The study concludes that application of recommended level of NPK caused least changes in N metabolism leading to minimum yield losses due to elevated UV-B stress.
机译：评估了UV-B升高（280-315 nm）对氮代谢，碳水化合物库，总酚，光合色素，吸收UV-B的化合物，与氧化胁迫，生物量和在不同水平下生长的豌豆产量相关的变量的影响NPK。测定的NPK水平为：背景NPK水平（F-0）;推荐的NPK（F-1）和推荐的NK + 1.5 x推荐的P（F-2）和UV-B的水平为：对照（C）和升高（T）。 T植物的响应随NPK的不同组合而变化。在所有氮磷钾水平下，UV-B升高，产量均降低，F0T降低最大，F1T降低最小。在所有NPK水平下，UV-Bat升高时，血红蛋白含量降低。 F0T工厂记录的丙二醛含量最大增加对应于更高的超氧化物和过氧化氢含量。在所有氮磷钾水平下，UV-B下亚硝酸盐还原酶活性均显着降低，但F1T和F2T中硝酸盐还原酶活性显着提高。 F2T植物叶片中C：N比例的最大降低表明蔗糖合成与硝酸盐在额外的P水平下的降低之间存在竞争。该研究得出结论，由于提高的UV-B胁迫，使用推荐水平的NPK可使N代谢的变化最小，从而导致最低的产量损失。

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