Journal
JOURNAL OF INTEGRATIVE AGRICULTURE
Volume 12, Issue 12, Pages 2157-2163Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S2095-3119(13)60345-7
Keywords
O-3; FACE; wheat; starch; activity of enzymes
Categories
Funding
- Innovation Program of Chinese Academy of Sciences [KZCX2-EW-414]
- International S&T Cooperation Program of China [2009DFA31110]
- Qing Lan Project Knowledge, Priority Academic Program Development of Jiangsu Higher Education Institutions, China
- Global Environment Research Fund, Ministry of the Environment, Japan [C-062]
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O-3 is not only greenhouse gas but also a primary gaseous contaminant in the atmosphere. It has long-lasting effects on crop growth, yield and quality, and brings a series of ecological and environmental problems. A free-air controlled enrichment (FACE) system was applied to study the effect of elevated ozone concentration on activities of key enzymes of starch synthesis of Yangmai 16 in 2009-2010. The main-plot treatment had two levels of O-3: ambient level (A-O-3) and 50% higher than ambient level (E-O-3). The main results were that accumulation rate of amylose, amylopectin and starch were represented in a single peak curve, and their content and accumulation amount rose gradually. The O-3 elevation decreased the accumulation rate of amylose, amylopectin and starch amylase, reduced the accumulation amount of amylopectin and starch, and decreased the content of amylopectin and starch, but increased the content of amylose. With the increase of O-3 concentration, the enzyme activity of grain granule-bound starch synthase (GBSS), soluble starch synthase (SSS) and starch branching enzyme (SBE) decreased after anthesis. The activities of GBSS and SSS had highly significant correlations with amylose, amylopectin and starch accumulation rate, and the activity of SBE had significant correlations with these items. So the O-3 elevation decreased the activity of key enzymes of starch synthesis, which led to the variation of starch synthesis.
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