Antioxidant activity in meiwa kumquat as affected by environmental and growing factors

Kondo, Satoru; Katayama, Rie; Uchino, Koji

doi:10.1016/j.envexpbot.2004.06.001

Cited by 21 publications

(9 citation statements)

References 19 publications

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“…Kumquat trees may flourish in hot countries and subtropical regions, but have the capability to tolerate freezing and subfreezing periods (Manner et al, 2006). Kumquat fruits provide health benefits to people through immune system enhancement (Kondo et al, 2005). The ･OH scavenging capacity of freeze-dried peel extract of kumquat is higher than that of scavenging O 2 ･¯ (Chen et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Temperature Effects on Shoot Growth and Flowering of Kumquat Trees

Chang¹,

Chen²,

Lin³

et al. 2014

HST

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This study investigated the effects of temperature on the shoot growth and flowering of potted kumquat [Fortunella margarita (Lour.) Swingle] trees grown in subtropical conditions of I-Lan County in Taiwan. Temperature treatments included T 25-32, T 17-25, T 22, and T 18. The T 25-32 treatment trees were to the day/night temperatures of 25/18°C for 2 weeks, followed by 28 weeks at 32/25°C. T 17-25 was exposed for 4 weeks to 17/10°C followed by 26 weeks at 25/18°C. T 22 and T 18 were exposed at 22/18°C and 18/13°C, respectively, for the entire duration of the experiment. Control trees were placed in a plastic greenhouse under conditions similar to the natural environment. The kumquat trees exposed to high-temperature environment of 32/25°C showed more frequent and speedy sprouting of new buds, but induced the earlier termination of shoot elongation growth, resulting in decreased vegetative growth. The temperature treatments lower than 22°C suppressed the new shoot production but increased the shoot growth period, resulting in increased shoot length and diameter. Temperatures higher than 25/18°C readily induced flowering, with flowering being advanced under the higher temperature conditions such as 32/25°C. However, flowering was substantially inhibited under temperature conditions lower than 22/18°C, indicating the negative role of relatively lower temperatures on flowering of kumquat trees.

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Section: Introductionmentioning

confidence: 99%

Temperature Effects on Shoot Growth and Flowering of Kumquat Trees

Chang¹,

Chen²,

Lin³

et al. 2014

HST

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“…Indeed, AsA, as an antioxidant, is also involved in a complex phytohormone-mediated signaling network that links ozone and pathogen responses. Application of Eth increased AsA concentrations in apple peel and meiwa kumquat skin or flesh (Burden and Bramlage, 1994;Kondo et al, 2005). The higher levels of glutathione and AsA observed in SA-deficient plants may contribute to their alleviated symptoms (Wang et al, 2011a).…”

Section: The Roles Of Asa During Pathogenesismentioning

confidence: 99%

Expression of a GDP-L-galactose phosphorylase-like gene in a Chinese wild Vitis species induces responses to Erysiphe necator and defense signaling molecules

Hou

Li²,

Gao³

et al. 2013

Genet. Mol. Res.

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ABSTRACT. Using rapid amplification of cDNA ends, a full-length cDNA sequence of a GDP-L-galactose phosphorylase-like gene was isolated from leaves infected by Erysiphe necator in the Chinese wild (Vitis pseudoreticulata) clone, 'Baihe-35-1', an E. necator-resistant genotype. The full-length cDNA, designated as VpVTC, comprised 1943 bp and putatively encodes a 453-amino acid polypeptide containing an HIT motif. The deduced amino acid sequence showed high similarity with that of VTC genes from other plants. The expression of VpVTC, determined by reverse transcriptase-polymerase chain reaction, was induced by E. necator and defense signaling molecules, including salicylic acid, methyl jasmonate, and ethephon, in 'Baihe-35-1', the V. quinquangularis genotype 'Shang-24', and the E. necator-susceptible A GGP-like gene from a Chinese wild Vitis species V. pseudoreticulata genotype, 'Hunan-1'. Transcript levels of VpVTC correlated well with the degree of disease resistance in the 3 genotypes. Maximum induction of VpVTC by E. necator (>7-fold at 96 h postinoculation) occurred in 'Baihe-35-1', which also showed the fastest response to signaling molecules. Upregulating the expression of VpVTC in 'Baihe-35-1' resulted in a gradual increase in the ascorbic acid concentration of leaves inoculated with E. necator. Furthermore, VpVTC was expressed in leaves, stems, inflorescence, tendrils, and fruit at all developmental stages, with the highest level occurring in fruit 35 days after flowering.

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“…This means that vitamin B₁₂ (antioxidant) works in close participation with A. rhizogenes in the current study. Basically the suggested synergistic effect depended on the main function of antioxidant in protecting cells from oxidative injury throughout scavenging the created free radicals and it's importance as a co-factor for characterization of certain enzymes which are required in all organisms for large number of biological substances (Award et al, 2001 andKondo et al, 2005). Moreover, vitamin B₁₂ deficiency resulted in decreased creation of thyamidylic acid and purine nucleotide precursor of DNA synthesis which is necessary for normal cell division.…”

Section: Discussionmentioning

confidence: 99%

BIOLOGICAL FACTORS TO OPTIMIZE ROOTING AND SHOOT MULTIPLICATION ON MICRO-CUTTINGS OF VOLKAMER LEMON (Citrus volkameriana Ten.) ROOTSTOCK

Samaan

El–Kady

Shalan

et al. 2014

Journal of Plant Production

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The present investigation was conducted during the period between 2012 till 2013 in the Tissue Culture Laboratory of Horticulture Department, Faculty of Agriculture, the University of Mansoura, Egypt. Seeds of volkamer lemon rootstock were grown in vitro on Murashige and Skoog (1962) basal medium at full strength, hypocotyls of the resulted plantlets used as source to prepare micro-cuttings. Microcuttings before cultured on the same medium subjected to five treatments included infection with Agrobacterium rhizogenes and addition of antioxidant (Vitamin B₁₂) at 1.0 or 1.5 mg/L either solely or in combinations. Untreated control micro-cuttings cultured on the same medium were considered. Representative samples were taken at random at 15 th day later treatment date to be used for determining four internal chemical constituents present in the treated micro-cuttings. Five weeks later the effect of such treatments on adventitious roots induction and shoots multiplication evaluated through measurement of concerned parameters. The obtained results pointed to the treatment of A. rhizogenes inoculation in the presence of vitamin B₁₂ at 1.5 mg/L in culture medium "T₅" to be the most effective one to produce the best rooting performance, root number and diameter as well as roots fresh and dry weights. The same treatment also increased rooting% and roots length over the control microcuttings as well as it causes an increase on carbohydrates, nitrogen contents, phenols content and C/N ratio. Otherwise, it showed an inferior effects on start rooting, explants survival% and rooting% compared with vitamin B₁₂ treatments "T₂&T₃" effect. Since the later two treatments succeeded to record significantly the earliest start rooting, the highest frequency of micro-cutting survival and rooting percentages. It is worth to say herein that the treatment of A. rhizogenes inoculation only "T₁" also has a positive effect to early start rooting and to enhance chemical constituents determined in basal part of treated micro-cuttings.

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Antioxidant activity in meiwa kumquat as affected by environmental and growing factors

Cited by 21 publications

References 19 publications

Temperature Effects on Shoot Growth and Flowering of Kumquat Trees

Temperature Effects on Shoot Growth and Flowering of Kumquat Trees

Expression of a GDP-L-galactose phosphorylase-like gene in a Chinese wild Vitis species induces responses to Erysiphe necator and defense signaling molecules

BIOLOGICAL FACTORS TO OPTIMIZE ROOTING AND SHOOT MULTIPLICATION ON MICRO-CUTTINGS OF VOLKAMER LEMON (Citrus volkameriana Ten.) ROOTSTOCK

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