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Int. J. Mol. Sci. 2017, 18(3), 589; doi:10.3390/ijms18030589

Exploring the Functions of 9-Lipoxygenase (DkLOX3) in Ultrastructural Changes and Hormonal Stress Response during Persimmon Fruit Storage

College of Horticulture, Northwest A&F University, Yangling 712100, China
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Academic Editor: María Serrano
Received: 30 October 2016 / Revised: 21 February 2017 / Accepted: 27 February 2017 / Published: 15 March 2017
(This article belongs to the Section Bioactives and Nutraceuticals)
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Abstract

Lipoxygenase (LOX) initiates the hydroperoxidation of polyunsaturated fatty acids and is involved in multiple physiological processes. In this study, investigation of various microscopic techniques showed that the fruit peel cellular microstructure of the two persimmon cultivars differed after 12 days of storage, resulting in fruit weight loss and an increased number and depth of microcracks. Analysis of subcellular localization revealed that greater amounts of DkLOX3-immunolabelled gold particles accumulated in “Fupingjianshi” than in “Ganmaokui” during storage. In addition, the expression of DkLOX3 was positively up-regulated by abscisic acid (ABA), concomitant with the promotion of ethylene synthesis and loss of firmness, and was suppressed by salicylic acid (SA), concomitant with the maintenance of fruit firmness, inhibition of ethylene production and weight loss. In particular, the expression of DkLOX3 differed from the ethylene trajectory after methyl jasmonate (MeJA) treatment. Furthermore, we isolated a 1105 bp 5′ flanking region of DkLOX3 and the activity of promoter deletion derivatives was induced through various hormonal treatments. Promoter sequence cis-regulatory elements were analysed, and two conserved hormone-responsive elements were found to be essential for responsiveness to hormonal stress. Overall, these results will provide us with new clues for exploring the functions of DkLOX3 in fruit ripening and hormonal stress response. View Full-Text
Keywords: deletion derivatives; fruit peel; fruit ripening; GUS activity; immunolabelling; promoter deletion derivatives; fruit peel; fruit ripening; GUS activity; immunolabelling; promoter
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MDPI and ACS Style

Meng, K.; Hou, Y.; Han, Y.; Ban, Q.; He, Y.; Suo, J.; Rao, J. Exploring the Functions of 9-Lipoxygenase (DkLOX3) in Ultrastructural Changes and Hormonal Stress Response during Persimmon Fruit Storage. Int. J. Mol. Sci. 2017, 18, 589.

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