Articles
Exogenous application of auxin promotes carotenoid accumulation in citrus fruit after harvest
Article number
1336_1
Pages
1 – 8
Language
English
Abstract
Carotenoids are a group of tetraterpene pigments widely distributed in nature, and responsible for red, orange, and yellow colors of fruit and vegetables.
Citrus fruit is a rich source of carotenoid.
The carotenoid content and composition are important indexes of citrus fruit quality.
In the present study, the effects of postharvest treatment of 1-naphthaleneacetic acid (NAA) on carotenoid biosynthesis were investigated in the flavedo of citrus fruit.
The results showed that postharvest treatment of NAA effectively improved carotenoid accumulation in the flavedo in a concentration-dependent manner.
Along with the increases of NAA concentration, there was a gradual increase of carotenoids contents in the flavedo of citrus fruit.
In the treatment of 500 μM NAA, the contents of β-carotene, β-cryptoxanthin, lutein, all-trans-violaxanthin, and 9-cis-violaxanthin were significantly increased, and the expression of carotenoid biosynthetic genes (CitPSY, CitZDS, CitLCYb1, CitLCYb2, CitLCYe, CitHYb, CitHYe, and CitZEP) was simultaneously upregulated in the flavedo of citrus fruit.
In addition, we found that 15°C was an optimal temperature for the storage of the NAA-treated fruit after harvest.
Moreover, the combination of NAA treatment with red LED light could enhance the positive effects of NAA on carotenoid accumulation in citrus fruit after harvest.
In this study, to improve the coloration of GA and PDJ-treated fruit, we treated the fruit with 500 μM NAA after harvest.
The results suggested that postharvest treatment of NAA has a great potential in improving the poor coloration of GA and PDJ-treated fruit through the induction of carotenoid biosynthesis in the flavedo.
The results presented in this study indicated that NAA is a positive regulator of carotenoid biosynthesis in citrus fruit, and the postharvest application of NAA contributed to improving the quality and commercial values of citrus fruit.
Citrus fruit is a rich source of carotenoid.
The carotenoid content and composition are important indexes of citrus fruit quality.
In the present study, the effects of postharvest treatment of 1-naphthaleneacetic acid (NAA) on carotenoid biosynthesis were investigated in the flavedo of citrus fruit.
The results showed that postharvest treatment of NAA effectively improved carotenoid accumulation in the flavedo in a concentration-dependent manner.
Along with the increases of NAA concentration, there was a gradual increase of carotenoids contents in the flavedo of citrus fruit.
In the treatment of 500 μM NAA, the contents of β-carotene, β-cryptoxanthin, lutein, all-trans-violaxanthin, and 9-cis-violaxanthin were significantly increased, and the expression of carotenoid biosynthetic genes (CitPSY, CitZDS, CitLCYb1, CitLCYb2, CitLCYe, CitHYb, CitHYe, and CitZEP) was simultaneously upregulated in the flavedo of citrus fruit.
In addition, we found that 15°C was an optimal temperature for the storage of the NAA-treated fruit after harvest.
Moreover, the combination of NAA treatment with red LED light could enhance the positive effects of NAA on carotenoid accumulation in citrus fruit after harvest.
In this study, to improve the coloration of GA and PDJ-treated fruit, we treated the fruit with 500 μM NAA after harvest.
The results suggested that postharvest treatment of NAA has a great potential in improving the poor coloration of GA and PDJ-treated fruit through the induction of carotenoid biosynthesis in the flavedo.
The results presented in this study indicated that NAA is a positive regulator of carotenoid biosynthesis in citrus fruit, and the postharvest application of NAA contributed to improving the quality and commercial values of citrus fruit.
Authors
M. Kato
Keywords
auxin, carotenoid, citrus, gene expression, NAA, red LED light
Online Articles (53)