Lab of Air Pollution and Global Climate Change, Ecology Research Circle, Department of Botany, Banaras Hindu University, Varanasi 221005, India.
Ecotoxicol Environ Saf. 2012 Nov;85:1-12. doi: 10.1016/j.ecoenv.2012.08.012. Epub 2012 Sep 15.
Tropospheric ozone (O(3)) has become a serious threat to growth and yield of important agricultural crops over Asian regions including India. Effect of elevated O(3) (ambient+10ppb) was studied on Brassica campestris L. (cv. Sanjukta and Vardan) in open top chambers under natural field conditions. Eight hourly mean ambient O(3) concentration varied from 26.3ppb to 69.5ppb during the growth period. Plants under O(3) exposure showed reductions in photosynthetic rate, reproductive parameters, yield as well as seed and oil quality. Cultivar Sanjukta showed more reduction in photosynthetic characteristics, reproductive structures and seed and oil quality. However, total yield was more affected in Vardan. Exposure of O(3) increased the degree of unsaturation and level of PUFA, ω-6fatty acid, linolenic acid and erucic acid in oil indicating the deterioration of its quality. The study further confirmed that there is a correspondence between O(3) induced change in photosynthetic processes, reproductive development and yield and did not find any compensatory response in the final yield.
大气臭氧（O(3)）已成为包括印度在内的亚洲地区重要农业作物生长和产量的严重威胁。本研究在自然田间条件下，使用开顶式气室，以 Brassica campestris L.（cv. Sanjukta 和 Vardan）为研究对象，探究了大气臭氧（环境+10ppb）升高对其的影响。在生长期间，8 小时平均环境 O(3)浓度从 26.3ppb 变化到 69.5ppb。暴露在 O(3)下的植物表现出光合速率、生殖参数、产量以及种子和油品质的降低。在光合特性、生殖结构以及种子和油品质方面，品种 Sanjukta 的降低程度更高。然而，Vardan 的总产受影响更大。O(3)的暴露增加了油中不饱和程度和多不饱和脂肪酸（PUFA）、ω-6 脂肪酸、亚麻酸和芥酸的水平，表明其质量恶化。本研究进一步证实，O(3)诱导的光合作用过程、生殖发育和产量变化之间存在对应关系，并且在最终产量中没有发现任何补偿性反应。
