Journal
SCIENTIA HORTICULTURAE
Volume 168, Issue -, Pages 73-80Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scienta.2014.01.021
Keywords
Citric acid-metabolizing enzymes; Fruit quality; Mulch cultivation; Sucrose-metabolizing enzymes
Categories
Funding
- Fundamental research funds for the Central Universities in China [2013PY082, 2011PY102]
- major state basic research development program of China [2011CB100600]
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Soil plastic film mulch is commonly employed in citrus production regions of East Asia to improve fruit quality. In the present study, Ponkan tangerine (Citrus reticulata Blanco) was mulched under the tree canopy with silver-black reflective film during fruit development. At about 12 days after mulching, total soluble sugar and citric acid contents in the segment membrane and/or juice sacs of fruit from mulched trees increased significantly relative to the control. In the segment membrane, the activities of acid invertase (AI) and sucrose synthase (SS; cleavage direction) increased significantly following mulch treatment. However, the activities of other enzymes, including neutral invertase, SS (synthetic direction) and sucrose phosphate synthase did not respond significantly under mulch treatment. In the juice sacs, SS activity (cleavage direction) from mulched treatments was significantly lower than that from control trees while SS activity (synthetic direction) from mulched trees was significantly higher than that from control trees. Moreover, the activities of cytoplasm aconitase (cyt-Aco) and isocitrate dehydrogenase (cyt-IDH) were significantly lower than those in the control fruits after 36 days of mulching. In conclusion, the activities of SS (synthetic direction) and Al were significantly enhanced while those of cyt-Aco and cyt-IDH were significantly reduced by soil plastic film mulch. A schematic model is present indicating the possible important roles that these key enzymes play in sugar and acid accumulation in citrus fruits under soil plastic film mulch. (C) 2014 Elsevier B.V. All rights reserved.
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