Effect of Postharvest Temperature and Ethylene on Carotenoid Accumulation in the Flavedo and Juice Sacs of Satsuma Mandarin (Citrus unshiu Marc.) Fruit

2009 ◽  
Vol 57 (11) ◽  
pp. 4724-4732 ◽  
Author(s):  
Hikaru Matsumoto ◽  
Yoshinori Ikoma ◽  
Masaya Kato ◽  
Naoko Nakajima ◽  
Yoshinori Hasegawa
Keyword(s):  
Citrus Unshiu ◽  
Carotenoid Accumulation ◽  
Satsuma Mandarin ◽  
Juice Sacs

scholarly journals Physiological and Ultrastructural Alterations Linked to Intrinsic Mastication Inferiority of Segment Membranes in Satsuma Mandarin (Citrus unshiu Marc.) Fruits

Plants ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 39
Author(s):  
Xuefei Lian ◽  
Feifei Li ◽  
Yuanyuan Chang ◽  
Tie Zhou ◽  
Yuewen Chen ◽  
...  
Keyword(s):  
Shear Force ◽  
Vessel Diameter ◽  
Water Soluble ◽  
Citrus Unshiu ◽  
Citrus Fruits ◽  
Satsuma Mandarin ◽  
Cell Layers ◽  
Juice Sacs

Chewing texture is important for fresh citrus fruits, and the mastication trait of a segment directly determines chewing texture. Roughing disorder impairs the quality of Satsuma mandarin fruits, and it is typically correlated with intrinsic mastication inferiority (IMI). This study explored the role of segment membranes (SMs) in IMI. Similar to IMI in roughing-disordered fruits, segment shear force significantly enhanced relative to controls (CK); cell layers and cell wall thickness increased also in inferior masticating SMs. The ‘Miyamoto Wase’ cultivar exhibited larger segment shear force and more SM cell layers than ‘Juxiangzao’. In SMs, vessel cells could be divided into outside layers where segments adjoin and inside layers where juice sacs grow from. The inside vessel cell layers in the inferior masticating SMs were denser. Vessels with a length of 200 to 300 μm and a diameter of 5 to 15 μm predominated in SMs. The average vessel diameter enlarged by 13% to 16.5% in inferior masticating SMs, depending on cultivars. Furthermore, there was a decrease in vessels with a diameter <5 μm and an increase in vessels >10 μm in the inferior masticating SMs. Between phenotypes, protopectin increased significantly throughout development of inferior masticating SMs, while water-soluble pectin increased during the later stages of development. In one inferior masticating SM sample, protopectin and water-soluble pectin levels were higher in the inner-ring area than those in the outer-ring area. Correspondingly, expression of CuPME21 which is involved in pectin hydrolysis was consistently upregulated in the inferior masticating SMs throughout fruit development. The findings in this work provide novel insights into citrus SM structure and its IMI.

scholarly journals Effects of Salicylic Acid and Methyl Jasmonate Treatments on Flavonoid and Carotenoid Accumulation in the Juice Sacs of Satsuma Mandarin In Vitro

2020 ◽  
Vol 10 (24) ◽  
pp. 8916
Author(s):  
Risa Yamamoto ◽  
Gang Ma ◽  
Lancui Zhang ◽  
Miki Hirai ◽  
Masaki Yahata ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Methyl Jasmonate ◽  
Citrus Fruit ◽  
Defense Responses ◽  
Transcriptional Level ◽  
Carotenoid Accumulation ◽  
Satsuma Mandarin ◽  
Meja Treatment ◽  
Juice Sacs

Salicylic acid and jasmonic acid are two important plant hormones that trigger the plant defense responses and regulate the accumulation of bioactive compounds in plants. In the present study, the effects of salicylic acid (SA) and methyl jasmonate (MeJA) on flavonoid and carotenoid accumulation were investigated in the juice sacs of Satsuma mandarin in vitro. The results showed that SA treatment was effective to enhance the contents of eriocitrin, narirutin, poncirin, and β-cryptoxanthin in the juice sacs (p < 0.05). In contrast, the MeJA treatment inhibited flavonoid and carotenoid accumulation in the juice sacs (p < 0.05). Gene expression results showed that the changes of flavonoid and carotenoid contents in the SA and MeJA treatments were highly regulated at the transcriptional level. In addition, a transcriptional factor CitWRKY70 was identified in the microarray analysis, which was induced by the SA treatment, while suppressed by the MeJA treatment. In the SA and MeJA treatments, the change in the expression of CitWRKY70 was consistent with that of flavonoid and carotenoid biosynthetic key genes. These results indicated that CitWRKY70 might be involved in the regulation of flavonoid and carotenoid accumulation in response to SA and MeJA treatments in the juice sacs of citrus fruit.

Effects of rootstock and crop load on sap flow rate in branches of ‘Shirakawa Satsuma’ mandarin (Citrus unshiu Marc.)

2004 ◽  
Vol 102 (3) ◽  
pp. 295-300 ◽  
Author(s):  
Yoshimi Yonemoto ◽  
Kazunori Matsumoto ◽  
Tadashi Furukawa ◽  
Masaaki Asakawa ◽  
Hitoshi Okuda ◽  
...  
Keyword(s):  
Flow Rate ◽  
Sap Flow ◽  
Citrus Unshiu ◽  
Crop Load ◽  
Satsuma Mandarin

scholarly journals Predicting the Number of Flowers in Satsuma Mandarin (Citrus unshiu Marc.) Trees Based on Citrus FLOWERING LOCUS T mRNA Levels

2017 ◽  
Vol 86 (3) ◽  
pp. 305-310 ◽  
Author(s):  
Fumie Nishikawa ◽  
Mitsunori Iwasaki ◽  
Hiroshi Fukamachi ◽  
Tomoko Endo
Keyword(s):  
Citrus Unshiu ◽  
Mrna Levels ◽  
Flowering Locus T ◽  
Satsuma Mandarin ◽  
Flowering Locus

scholarly journals Leaf Carbohydrates and Flower Formation in Citrus

1995 ◽  
Vol 120 (2) ◽  
pp. 222-227 ◽  
Author(s):  
A. Garcia-Luis ◽  
F. Fornes ◽  
J.L. Guardiola
Keyword(s):  
Low Temperature ◽  
Induction Period ◽  
Flower Induction ◽  
Flower Formation ◽  
Citrus Unshiu ◽  
Satsuma Mandarin ◽  
Leaf Carbohydrates ◽  
Carbohydrate Levels ◽  
The Relationship ◽  
Carbohydrate Contents

The carbohydrate contents of the leaves of satsuma mandarin (Citrus unshiu Marc.) trees were altered before or during the low temperature flower induction period to determine the relationship between gross levels of carbohydrates and flower formation. Early removal of the fruit and girdling of the branches on either fruiting or defruited trees caused an accumulation of carbohydrates in the leaves and increased flower formation. Shading the trees resulted in a transient reduction in leaf carbohydrate levels and in a decrease in flower formation. Although a relationship between carbohydrate levels and flowering was consistently found, our results show that the gross levels of carbohydrates do not appear to limit flower formation in citrus.

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