Differential formation of octadecadienoic acid and octadecatrienoic acid products in control and injured/infected potato tubers

Reddy, P. N.; Kumar, Tapas; Reddy, Meda Narsi; Sarada, C.; Reddanna, Pallu

doi:10.1016/s1388-1981(99)00191-2

Cited by 22 publications

(15 citation statements)

References 22 publications

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“…The role of 9-HPOTrE in the plant defense response suggests that there may be a new pathway leading to LOX-mediated defense responses (Reddy et al, 2000). The same results have been observed in pigeon pea seedlings after infection with Fusarium udum (Reddy et al, 2000). Transcript abundance of genes encoding lipoxygenase was much lower at 10 wai (weeks after infection) than at 12 dai in roots infected by RKN .…”

Section: Alpha-linolenic Acid and Jasmonic Acid Biosynthesissupporting

confidence: 56%

“…In potato plants, 9-HPOTrE is produced in response to injury or infection. The role of 9-HPOTrE in the plant defense response suggests that there may be a new pathway leading to LOX-mediated defense responses (Reddy et al, 2000). The same results have been observed in pigeon pea seedlings after infection with Fusarium udum (Reddy et al, 2000).…”

Section: Alpha-linolenic Acid and Jasmonic Acid Biosynthesissupporting

confidence: 55%

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Changes in the Expression of Genes in Soybean Roots Infected by Nematodes

Matthews¹,

Ibrahim²,

Klink³

2011

Soybean - Genetics and Novel Techniques for Yield Enhancement

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Section: Alpha-linolenic Acid and Jasmonic Acid Biosynthesissupporting

confidence: 56%

Section: Alpha-linolenic Acid and Jasmonic Acid Biosynthesissupporting

confidence: 55%

Changes in the Expression of Genes in Soybean Roots Infected by Nematodes

Matthews¹,

Ibrahim²,

Klink³

2011

Soybean - Genetics and Novel Techniques for Yield Enhancement

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“…Another possibility for the function of tuber LOXs can be explained by their dual enzymatic capacity. The 9-hydroperoxide products may be produced as a defense against microbial attack (Vaughn and Gardner, 1993;Ricker and Bostock, 1994;Reddy et al, 2000) in the tuber, whereas the 13-hydroperoxide products, generated at much lower levels, may act to regulate tuber growth through the control of cell expansion. Low levels of expression of the 13-LOX of potato, designated H3, were detected in tubers (Royo et al, 1996).…”

mentioning

confidence: 99%

Lipoxygenase Is Involved in the Control of Potato Tuber Development

et al. 2001

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Plant lipoxygenases (LOXs) are a functionally diverse class of dioxygenases implicated in physiological processes such as growth, senescence, and stress-related responses. LOXs incorporate oxygen into their fatty acid substrates and produce hydroperoxide fatty acids that are precursors of jasmonic acid and related compounds. Here, we report the involvement of the tuber-associated LOXs, designated the Lox1 class, in the control of tuber growth. RNA hybridization analysis showed that the accumulation of Lox1 class transcripts was restricted to developing tubers, stolons, and roots and that mRNA accumulation correlated positively with tuber initiation and growth. In situ hybridization showed that Lox1 class transcripts accumulated in the apical and subapical regions of the newly formed tuber, specifically in the vascular tissue of the perimedullary region, the site of the most active cell growth during tuber enlargement. Suppression mutants produced by expressing antisense coding sequence of a specific tuber LOX, designated POTLX-1 , exhibited a significant reduction in LOX activity in stolons and tubers. The suppression of LOX activity correlated with reduced tuber yield, decreased average tuber size, and a disruption of tuber formation. Our results indicate that the pathway initiated by the expression of the Lox1 class genes of potato is involved in the regulation of tuber enlargement. INTRODUCTIONTuber formation in potatoes is a complex developmental process that requires the interaction of environmental, biochemical, and genetic factors. Several important biological processes, such as carbon partitioning, signal transduction, and meristem determination are involved (Ewing and Struik, 1992). Under conditions of a short-day photoperiod and cool temperature, a transmissible signal is activated that initiates cell division and expansion and a change in the orientation of cell growth in the subapical region of the stolon tip (Ewing and Struik, 1992; Xu et al., 1998a). In this signal transduction pathway, perception of the appropriate environmental cues occurs in leaves and is mediated by phytochrome and gibberellins (van den Berg et al., 1995; Jackson and Prat, 1996; Jackson et al., 1996). van den Berg et al. (1996) detected at least 10 quanitative trait loci that control the ability to tuberize under long days, but none of these genes has been identified definitively.Tuber development at the stolon tip consists of biochemical and morphological processes. Both processes are controlled by differential gene expression (Hannapel, 1991; Bachem et al., 1996; Macleod et al., 1999), and most of the research in this area has focused on the biochemical processes, including starch synthesis (Abel et al., 1996;Preiss, 1996; Geigenberger et al., 1998) and storage protein accumulation (Mignery et al., 1984; Hendriks et al., 1991;Suh et al., 1991). Much less is known about the morphological controls of tuberization, although it is clear that phytohormones play a prominent role (Koda et al., 1991; Xu et al., 1998b;Sergeeva et ...

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“…and differentially modulate aflatoxin pathway gene transcription in the Aspergillus/seed interaction (Burow et al 2000). Srinivas Reddy et al (2000) found that 9-hydroperoxy fatty acid derived from linoleic acid is a major LOX product formed in control plants, and 9-hydroperoxy fatty acid derived from =-linolenic acid is the major product formed in potato tubers in response to injury or infection with Rhizoctonia bataticola. They proposed that lipoxygenase metabolites of octadecadienoic acid (linoleic acid) may be involved in physiological responses under control conditions, while octadecatrienoic acid (=-linolenic acid) metabolites are mediating the defense responses.…”

Section: Physiological Significance Of the Lipid Peroxidationmentioning

confidence: 99%

Lipid peroxidation in plant cells, its physiological role and changes under heavy metal stress

Skórzyńska-Polit

2011

Acta Soc Bot Pol

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Lipid peroxidation, which is a natural and essential process, can occur in a non-enzymatic and/or enzymatic way in plant cells. Some of its products have cytotoxic effects on cells, but others function as plant effectors. The lipid peroxidation in plants exposed to heavy metal stress depends on the metal, plant organ, plant species and its genotype.KEY WORDS: heavy metal stress, lipid peroxidation, lipoxygenase.

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Differential formation of octadecadienoic acid and octadecatrienoic acid products in control and injured/infected potato tubers

Cited by 22 publications

References 22 publications

Changes in the Expression of Genes in Soybean Roots Infected by Nematodes

Changes in the Expression of Genes in Soybean Roots Infected by Nematodes

Lipoxygenase Is Involved in the Control of Potato Tuber Development

Lipid peroxidation in plant cells, its physiological role and changes under heavy metal stress

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