Drought Stress in Tomatoes: Changes in Plant Chemistry and Potential Nonlinear Consequences for Insect Herbivores

English-Loeb, Greg; Stout, Michael J.; Duffey, Sean S.

doi:10.2307/3546888

Cited by 114 publications

(111 citation statements)

References 51 publications

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“…The abscission of older leaves might represent an adaptive strategy under water stress since it could reduce further water loss and allow limited nutrients to be partitioned to younger tissues [13]. Induction of PPO activities under water stress has been previously demonstrated in tomatoes [46]. In other plant species such as coconut, increased PPO was also observed under water stress condition [47].…”

Section: Role Of Ppo During Water Stressmentioning

confidence: 99%

Functional Analysis of Polyphenol Oxidases by Antisense/Sense Technology

2007

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Polyphenol oxidases (PPOs) catalyze the oxidation of phenolics to quinones, the secondary reactions of which lead to oxidative browning and postharvest losses of many fruits and vegetables. PPOs are ubiquitous in angiosperms, are inducible by both biotic and abiotic stresses, and have been implicated in several physiological processes including plant defense against pathogens and insects, the Mehler reaction, photoreduction of molecular oxygen by PSI, regulation of plastidic oxygen levels, aurone biosynthesis and the phenylpropanoid pathway. Here we review experiments in which the roles of PPO in disease and insect resistance as well as in the Mehler reaction were investigated using transgenic tomato (Lycopersicon esculentum) plants with modified PPO expression levels (suppressed PPO and overexpressing PPO). These transgenic plants showed normal growth, development and reproduction under laboratory, growth chamber and greenhouse conditions. Antisense PPO expression dramatically increased susceptibility while PPO overexpression increased resistance of tomato plants to Pseudomonas syringae. Similarly, PPO-overexpressing transgenic plants showed an increase in resistance to various insects, including common cutworm (Spodoptera litura (F.)), cotton bollworm (Helicoverpa armigera (Hübner)) and beet army worm (Spodoptera exigua (Hübner)), whereas larvae feeding on plants with suppressed PPO activity had higher larval growth rates and Molecules 2007, 12 1570 consumed more foliage. Similar increases in weight gain, foliage consumption, and survival were also observed with Colorado potato beetles (Leptinotarsa decemlineata (Say)) feeding on antisense PPO transgenic tomatoes. The putative defensive mechanisms conferred by PPO and its interaction with other defense proteins are discussed. In addition, transgenic plants with suppressed PPO exhibited more favorable water relations and decreased photoinhibition compared to nontransformed controls and transgenic plants overexpressing PPO, suggesting that PPO may have a role in the development of plant water stress and potential for photoinhibition and photooxidative damage that may be unrelated to any effects on the Mehler reaction. These results substantiate the defensive role of PPO and suggest that manipulation of PPO activity in specific tissues has the potential to provide broad-spectrum resistance simultaneously to both disease and insect pests, however, effects of PPO on postharvest quality as well as water stress physiology should also be considered. In addition to the functional analysis of tomato PPO, the application of antisense/sense technology to decipher the functions of PPO in other plant species as well as for commercial uses are discussed.

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Section: Role Of Ppo During Water Stressmentioning

confidence: 99%

Functional Analysis of Polyphenol Oxidases by Antisense/Sense Technology

2007

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“…High larval mortality of fall armyworm has also been reported on dry land soybean than on irrigated soybean (Huffman and Mueller, 1983). Similarly, larvae of beet armyworm resulted in reduced growth when reared on water-stressed tomato plant (English-Loeb et al, 1997). (Paritsis and Veblen, 2011) because water stress promotes the accumulation of free amino acids in plants which favour the development of insects (Showler, 2012).…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Different Integrated Pest Management Modules to Control Helicoverpa for Adaptation to Climate Change

Noor-ul-Ane¹,

Arif²,

Gogi³

et al. 2015

IJAB

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To cite this paper: Noor-ul-Ane, M., M.J. Arif, M.D. Gogi and M.A. Khan, 2015 armigera; whereas alone application of Neemosal proved least effective against H. armigera (0.32 larvae/plant). On the basis of cost benefit ratio (CBR), module-15 involving integrated implementation of Spinosad, Neemosal, C. carnea and H. hebetor explained highest yield (1639.52 kg/ha) and CBR (1: 6.15) and proved economical and effective IPM module. In conclusion, water stress condition had positive impact on H. armigera feeding-damage (bi-trophic interaction) but had negative impact on parasitism. Integration of bio-control agents, botanicals and reduced-risk insecticides would be more cost-effective than their alone or two-level integration.

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“…It an adaptive strategy under water stress since it could reduce further water loss and allow limited nutrients to be partitioned to younger tissues (Thipyapong, et al, 2004). Induction of PPO activities under water stress has been previously demonstrated in tomatoes (English-Loeb et al, 1997) and in coconut (Shivishankar, 1988). However, further investigation is needed to well-defined responsiveness of PPO to various abiotic and biotic stresses, depending on plant genotype and environmental as well as ecological context, may be an adaptive strategy of plants to cope with a multitude of stresses that often occur simultaneously (Krishnamoorthy et al, 2004& Raj et al, 2006.…”

Section: B 2 Polymorphisms Of Polyphenol Oxidase Isozymesmentioning

confidence: 99%

Isozyme Variations in some Wheat Genotypes at Siwa Oasis and Ashmon Habitats

2016

Egypt. J. Bot.

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HE VARIABILITY of grain storage-proteins of twelve wheat …..genotypes under stress (Siwa Oasis) and normal (Ashmon) habitats were analyzed using sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE). It was clear that small differences were found in the SDS-PAGE analysis of wheat endosperm proteins among the studied genotypes. The defense isozymes [Peroxidase (Px), Polyphenol oxidase (PPO) and Malate dehydrogenase (Mdh)] were detected and their results concluded a prominent role, either directly or indirectly in stress responses. High polymorphisms were observed in most genotypes for Mdh isozymes at Siwa habitat, meanwhile Px isozymes was decreased. Misr-1 genotype attained higher level of Px isozymes under stress habitat as a trait to tolerance response. The changes of PPO isozymes showed a good correlation with the abiotic stress tolerance of wheat genotypes. Thus, PPO increased in Nesr, S8/17, ACSAD-2, ACSAD-3 and NBL genotypes under stress condition (Siwa habitat).

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Drought Stress in Tomatoes: Changes in Plant Chemistry and Potential Nonlinear Consequences for Insect Herbivores

Cited by 114 publications

References 51 publications

Functional Analysis of Polyphenol Oxidases by Antisense/Sense Technology

Functional Analysis of Polyphenol Oxidases by Antisense/Sense Technology

Evaluation of Different Integrated Pest Management Modules to Control Helicoverpa for Adaptation to Climate Change

Isozyme Variations in some Wheat Genotypes at Siwa Oasis and Ashmon Habitats

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