کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4567287 1628848 2013 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dynamic shoot and root growth at different developmental stages of tomato (Solanum lycopersicum Mill.) under acute ozone stress
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش باغداری
پیش نمایش صفحه اول مقاله
Dynamic shoot and root growth at different developmental stages of tomato (Solanum lycopersicum Mill.) under acute ozone stress
چکیده انگلیسی

Ground level ozone is increasing around the world as a result of industrialization and anthropogenic activities, and this increase has become an environmental concern in agricultural production. Tomato is one of the ozone sensitive plants. To explore how the shoots and roots respond to acute ozone exposure, tomato plants were exposed to ozone at two growth stages. The plants were grown under a white net house throughout the growth study, and transparent plastic chambers were used for ozone exposure. In Experiment I, 500 μg m−3 (250 ppb) was applied to 30-day-old plants. In Experiment II, 200, 350 and 500 μg m−3 (100, 175 and 250 ppb) were applied to 51-day-old plants. The experiments were conducted at Kasetsart University, Thailand, from August 2010 to February 2011. Leaf injuries were higher in the younger plants than in the older ones depending on leaf rank. Reduction of the internode growth rate suggested that 500 μg m−3 ozone could delay the plant's growth just after exposure. Altered partitioning of dry matter in favour of the above ground parts was observed under ozone stress. Ozone depressed the relative total root length and root number depending on concentrations and plant ages. Depressed root growth was observed in both young and old plants. Younger plants showed reduction in root growth earlier than older ones but for a shorter duration. Comparison of root length and emergence (relative to the control plants) between the two growth stages suggested that plants better compensated for a loss of resources when ozone was applied at the younger stage, and this could be linked with the absence of fruits at this time. It can be concluded that tomato plants responded to ozone differently based on the period of their lives when they experienced ozone stress and the concentrations of it. Recovery processes after ozone injury largely depend on crop developmental stages at the time of stress.


► Tomato plants were exposed by ozone at two developmental stages.
► Injury levels of shoot and root growth vary depending on plant growth stages.
► More pronounced vulnerability appears in younger plants but for shorter duration.
► Better compensatory process in younger plants compared with the older ones.
► Variation of root growth dynamics depend on resource acquisition after injury.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Scientia Horticulturae - Volume 150, 4 February 2013, Pages 317–325
نویسندگان
, , , , , , ,